Toyota Tacoma (2015-2018) Service Manual: System Description

Toyota Tacoma (2015-2018) Service Manual / Door Lock / Smart Key System(for Entry Function) / System Description

SYSTEM DESCRIPTION

1. SYSTEM DESCRIPTION

The following pattern will be used: "Operation" indicates user operation using the smart key system. "Expected operation of the vehicle" indicates how a known good vehicle will react in accordance with each operation. "Suspected Area/Diagnosis" indicates suspected malfunctioning areas and tips for each diagnosis if the vehicle did not react as expected.

(a) Example: Operation No.

Operation	-
Expected operation of the vehicle	-
Waveform or Output Value	-

Suspected Area	Diagnosis
-	-

2. BASIC PRECAUTIONS

(a) DTC numbers and ECU Data Lists of the smart key system can be checked using the Techstream.

(b) Check for DTCs using the following procedure. If any DTCs are output, diagnose those DTCs first.

(1) Connect the Techstream to the DLC3.

(2) Turn the engine switch on (IG).

(3) Enter the following menus: Body Electrical / Smart Key, Power Source Control or Starting Control / Trouble Codes.

(c) If the engine switch cannot be turned on (IG), follow the procedure below to start communication between the Techstream and vehicle.

(1) When using the Techstream with the engine switch off, connect the Techstream to the DLC3 and turn a courtesy light switch on and off at intervals of 1.5 seconds or less until communication between the Techstream and the vehicle begins. Then select the vehicle type under manual mode and enter the following menus: Body Electrical / Smart Key. While using the Techstream, periodically turn a courtesy light switch on and off at intervals of 1.5 seconds or less to maintain communication between the Techstream and the vehicle.

(d) If cancel is selected for the smart key system customize setting, cancel the smart key cancel setting (See page 3. DIAGRAM OF SMART KEY SYSTEM ).

3. DIAGRAM OF SMART KEY SYSTEM

4. MULTI CHANNEL FUNCTION

(a) The electrical key transmitter sub-assembly and electrical key and TPMS receiver assembly can operate on two different RF channels. When an electrical key transmitter sub-assembly is brought within an exterior detection area, key verification begins. If key verification fails due to wave interference, the channel will be switched and key verification will be performed again.

The multi channel system begins verification using the channel on which the last verification was successfully performed. When verification fails, the system switches to the other channel.

Text in Illustration

*a	Exterior detection areas are created using LF waves (emitted from the vehicle at intervals of 0.25 seconds) to receive a response from the electrical key transmitter sub-assembly.	*b	When the electrical key transmitter sub-assembly is brought into an exterior detection area, it receives LF waves from the vehicle. Using RF waves, the electrical key transmitter sub-assembly responds to the vehicle.
*c	Upon receiving the response from the electrical key transmitter sub-assembly, the certification ECU (smart key ECU assembly) activates the electrical key antennas (outside) one by one. Using LF waves, the certification ECU (smart key ECU assembly) determines which exterior detection area the electrical key transmitter sub-assembly is in.	*d	The electrical key transmitter sub-assembly receives the LF waves from the vehicle and responds using RF waves. (The certification ECU (smart key ECU assembly) recognizes which exterior detection area the electrical key transmitter subassembly is in.)
*e	The certification ECU (smart key ECU assembly) sends registered key ID information to the electrical key transmitter sub-assembly using LF waves. (Up to 7 key IDs can be registered.)	*f	The electrical key transmitter sub-assembly sends the key ID information using RF waves. When the certification ECU (smart key ECU assembly) receives it, verification completes.
*g	Wave interference (Channel switching)	-	-

The multi channel system changes the channels when the RF band (*b, *d and *f) is interrupted by wave interference.

Refer to the table below to confirm when the system changes the channels.

	b or d is NG		*f is NG
Condition	RF waves cannot be received.	RF waves cannot be received properly.	RF waves cannot be received.	RF waves cannot be received properly.
Channel switching	The channels will not be switched.	The channels will be switched.	The channels will not be switched.	The channels will be switched*.

*: The channels are not switched during vehicle interior verification after an entry lock operation is performed.

HINT:

When the channels are switched, the history will be stored in the certification ECU (smart key ECU assembly). This history can be read using the Techstream. (See page 5. SMART KEY SYSTEM SPECIFICATIONS ).

5. SMART KEY SYSTEM SPECIFICATIONS

(a) Some customers may inquire about the frequency used by the smart key system (for Entry Function) on various models. This repair manual contains the applicable specifications of the smart key system (for Entry Function).

Text in Illustration

Transmitter Detection Area

Specifications for Smart Key System Antenna LF Output Power

	Specification
	Frequency	Output Power/Electric Field Intensity	Modulation Method	Mounting Point in Vehicle
Inside Passenger Compartment	134.2 kHz	94.4 dBuV/m at 3 m	AM	Inside front floor
Outside Vehicle	134.2 kHz	95 dBuV/m at 3 m	AM	Inside door handle

Specifications for Smart Key System Antenna LF Transmission Timing

	Transmission Timing
Vehicle Remains Parked	Entering or Exiting the Vehicle	Vehicle is being Driven
Inside Passenger Compartment	Does not transmit	Operating door locks Operating engine switch / depressing brake pedal Opening or closing doors With engine switch on (IG) or on (ACC), and in P, closing a door when the electrical key transmitter sub-assembly cannot be detected inside the vehicle (continues for 3 seconds until the electrical key transmitter sub-assembly is detected or the engine switch is turned off) Engine switch is off after driving for more than 20 minutes (Not in P) when shutting the door, if the electrical key transmitter sub-assembly cannot be detected inside the vehicle (Transmits for 3 seconds until the electrical key transmitter sub-assembly is located)	When electrical key transmitter sub-assembly is not detected inside passenger compartment while car is being driven (transmits for 4 seconds)
Outside Vehicle	(1) When door is locked, transmits at 250 ms intervals (stops when door is unlocked) (2) Does not transmit	(1) Touch the lock sensor (2) Touch the unlock sensor at power saving mode	Does not transmit

Transmission Timing

Vehicle Remains Parked

Entering or Exiting the Vehicle

Vehicle is being Driven

Inside Passenger Compartment

Does not transmit

Operating door locks
Operating engine switch / depressing brake pedal
Opening or closing doors
With engine switch on (IG) or on (ACC), and in P, closing a door when the electrical key transmitter sub-assembly cannot be detected inside the vehicle (continues for 3 seconds until the electrical key transmitter sub-assembly is detected or the engine switch is turned off)
Engine switch is off after driving for more than 20 minutes
(Not in P) when shutting the door, if the electrical key transmitter sub-assembly cannot be detected inside the vehicle (Transmits for 3 seconds until the electrical key transmitter sub-assembly is located)

When electrical key transmitter sub-assembly is not detected inside passenger compartment while car is being driven (transmits for 4 seconds)

Outside Vehicle

(1) When door is locked, transmits at 250 ms intervals (stops when door is unlocked)

(2) Does not transmit

(1) Touch the lock sensor

(2) Touch the unlock sensor at power saving mode

Does not transmit

6. DIAGNOSIS IN ACCORDANCE WITH USER OPERATION

(a) Operation 1

Operation

Turn the engine switch off and lock all the doors, then take the electrical key transmitter sub-assembly approximately 3 m (9.84 ft.) or more away from the vehicle.

HINT:

The detection area of each electrical key antenna (outside) is formed by emitting a periodic LF band request signal every 0.25 seconds. The detection area formed by each front door outside handle assembly (electrical key antenna) has a detection range of approximately 0.7 m (2.30 ft.).

Waveform or Output Value

Pulse generation (C29-4 (CLG1) - C29-11 (E)*)

*: See page

(b) Operation 2

Operation

Bring the electrical key transmitter sub-assembly within 0.7 m (2.30 ft.) of the driver door.

HINT:

The system is in unlock standby mode when the electrical key transmitter sub-assembly is in the detection area and the key ID code sent by the electrical key transmitter sub-assembly matches the key ID code stored by the certification ECU (smart key ECU assembly). The door unlocks if the unlock sensor is touched by hand with the system in unlock standby mode.

Signal transmission: Certification ECU (smart key ECU assembly) → Front door outside handle assembly LH (electrical key antenna) → Electrical key transmitter sub-assembly → Electrical key and TPMS receiver assembly → Certification ECU (smart key ECU assembly) → Main body ECU (multiplex network body ECU)

Expected operation of the vehicle

The electrical key transmitter sub-assembly LED starts blinking. If it does not, any of the parts listed in the table below may be malfunctioning.

Waveform or Output Value

Pulse generation (C29-4 (CLG1) - C29-11 (E)*)
Pulse generation (C28-18 (RCO) - C29-11 (E)*)
Pulse generation (C28-22 (RDAM) - C29-11 (E)*)
Pulse generation (C28-19 (CESL) - C29-11 (E)*)

*: See page

Suspected Area	Diagnosis
Electrical key transmitter sub-assembly	The key ID code sent by the electrical key transmitter sub-assembly does not match the key ID code stored in the certification ECU (smart key ECU assembly). Use another electrical key transmitter sub-assembly to check the operation. If the LED of the electrical key transmitter sub-assembly does not blink when it is brought within 0.7 m (2.30 ft.) of the driver door, perform the following procedure. Press the lock and unlock buttons of the electrical key transmitter sub-assembly to check the operation. If the doors can be locked and unlocked, that means the detection area has not been formed. Parts other than the electrical key transmitter sub-assemblies and electrical key and TPMS receiver assembly may be malfunctioning. If the electrical key transmitter sub-assembly malfunctions, the engine cannot be started and the engine switch cannot be turned on (ACC or IG). Under normal operation, the "Power ON" is displayed on the multi-information display in the combination meter assembly when the engine switch is pressed with the electrical key transmitter sub-assembly in the driver seat, the shift lever in P and the brake pedal not depressed. If the door cannot be opened, use the mechanical key installed in the electrical key transmitter sub-assembly to open the door. HINT: Before replacing the electrical key transmitter sub-assembly, check if the transmitter battery is depleted.
Transmitter battery is depleted	Press and hold the lock switch of the electrical key transmitter sub-assembly for 5 seconds and check the number of times that the transmitter LED blinks. If the transmitter LED does not blink or blinks only once or twice, the transmitter battery may be depleted. If the transmitter LED does not blink at all, the electrical key transmitter sub-assembly may be malfunctioning. If the transmitter battery voltage at the time the electrical key transmitter sub-assembly sends a signal drops to 2.2 V or less, "Yes" is displayed for "Key Low Battery" in the Data List. If the transmitter battery voltage drops to 2.0 V or lower, operation cannot be assured. HINT: The output of the electrical key transmitter sub-assembly will decrease if it is in low temperatures. When the transmitter battery is depleted, the engine cannot be started and the engine switch cannot be turned on (ACC or IG). If the electrical key transmitter sub-assembly is held near the engine switch the engine can be started. Make sure that the transmitter battery type and installation direction are correct.
Wave Interference	If the problem occurs in certain locations or times of day, the possibility of wave interference is high. When the electrical key transmitter sub-assembly is malfunctioning, the transmitter battery is depleted, an electrical key transmitter sub-assembly from another vehicle has been used or wave interference is suspected. "Yes" may be displayed for any of the following Data List items: "Unmatch Code or Form", "No Response", "ID Code Difference" or "Unmatched Vehicle-ID"
Certification ECU (smart key ECU assembly)	-
Front door outside handle assembly LH	Vehicle exterior detection area is not formed properly. Even if the vehicle exterior detection area is not formed properly, the engine switch can be turned on (ACC) and the engine can be started. Formation of the vehicle exterior detection area can be confirmed by using the Techstream. (See page ). Even if the vehicle exterior detection area is not formed properly, the doors can be unlocked by pressing the unlock button of the electrical key transmitter sub-assembly.
Electrical Key and TPMS Receiver Assembly	If the electrical key and TPMS receiver assembly is malfunctioning, it is not possible to unlock the doors by a wireless unlock operation. If the electrical key and TPMS receiver assembly is malfunctioning, the engine cannot be started and the engine switch cannot be turned on (ACC or IG) unless in an emergency. Formation of the vehicle exterior detection area can be confirmed by using the Techstream. (See page ).
Vehicle Battery is discharged	It may be possible to tell whether the vehicle battery is discharged by operating the horn.
Others	If the smart key system function has been canceled through the customize function, the detection area cannot be formed, therefore the electrical key transmitter sub-assembly LED will not blink even if the electrical key transmitter sub-assembly is brought near a front door outside handle assembly. If the electrical key transmitter sub-assembly is in battery saving mode, even if it receives LF waves from the vehicle, it does not respond using RF waves, therefore the electrical key transmitter sub-assembly LED does not blink. In the smart key system, if the electrical key transmitter sub-assembly is constantly in the exterior detection area of one of the doors, the transmitter battery could be drained. For this reason, if this state continues longer than 10 minutes, the smart key system automatically deactivates the exterior detection area that the electrical key transmitter sub-assembly is in. If the electrical key transmitter sub-assembly is left in the vehicle and the doors are locked using another electrical key transmitter sub-assembly, the electrical key transmitter sub-assembly LED will not blink even if it is brought near a front door outside handle assembly.

Operation	Touch the unlock sensor of the driver door with the electrical key transmitter sub-assembly in the exterior detection area.
Expected operation of the vehicle	While the doors are unlocked, the answer back is performed at the same time. If they do not, any of the parts listed in the table below may be malfunctioning.
Waveform or Output Value	Pulse generation (C29-4 (CLG1) - C29-11 (E)) Tester connection "main body ECU (multiplex network body ECU), driver side junction block (ACT-)"

*: See page

Suspected Area	Diagnosis
The suspected parts below overlap with the parts covered in operation 2 for when the electrical key transmitter sub-assembly LED does not blink.	-
Front door outside handle assembly LH (unlock sensor)	Under normal operation, "ON" is displayed for the Data List item "D-Door Touch Sensor" when the unlock sensor is touched.
Door lock/unlock mechanism	If a door cannot be locked/unlocked by operating the door control switch on the door in the cabin, the door lock mechanism is malfunctioning.

(d) Operation 4

Operation

After getting into the vehicle while carrying the electrical key transmitter sub-assembly, close the door and press the engine switch once with the shift lever in P while not depressing the brake pedal.

Expected operation of the vehicle

The blinking security indicator light goes off, and then the set immobiliser function cancels, allowing the vehicle to be driven.
The steering wheel is unlocked.

If it does not, the parts listed below may be malfunctioning.

HINT:

When the engine switch is pressed, the indoor electrical key antenna forms a key detection area inside the vehicle and detects the electrical key transmitter sub-assembly in the cabin. The electrical key transmitter sub-assembly sends the ID code upon receiving a request signal and the electrical key transmitter sub-assembly LED illuminates for a short time. After pressing the engine switch, if the key ID code sent by the electrical key transmitter sub-assembly matches the key ID code stored by the certification ECU (smart key ECU assembly), the ACC relay turns on and the "ACCESSORY" is displayed on multi-information display in combination meter assembly. Then after the power source mode has changed and L code verification has been completed, the steering wheel will be unlocked and the immobiliser will be inactive. Then the Data List status of "Immobiliser" will be changed from "Set" to "Unset".

Signal transmission: Certification ECU (smart key ECU assembly) → Indoor electrical key antenna → Electrical key transmitter sub-assembly → Certification ECU (smart key ECU assembly)

HINT:

The interior detection area is formed when any of the following conditions are met:

Within approximately 30 seconds after any of the doors have been closed and opened.
Within approximately 30 seconds after any of the doors have been opened and closed.
The brake pedal is depressed.
Within approximately 30 seconds after the brake pedal has been depressed.
Right after the engine switch is pressed.

Waveform or Output Value

Pulse generation (C28-22 (RDAM) - C29-11 (E)*)
Pulse generation (C29-21 (CLG5) - C29-11 (E)*)
Pulse generation (C29-9 (ACCD) - C29-11 (E)*)

*: See page

Suspected Area	Diagnosis
Certification ECU (smart key ECU assembly)	-
Wave Interference	If malfunctions occur at a specific location/time, wave interference may be the cause. If wave interference is suspected in the cabin, disconnect all the connectors of electronic devices besides standard equipment, or remove the electronic devices and check for noise.
Indoor electrical key antenna assemblies that form the interior detection areas.	If the interior detection areas are not formed properly, the engine cannot be started and the engine switch cannot be turned on (ACC or IG). If the electrical key transmitter sub-assembly is held near the engine switch in an emergency, the engine can be started. Using the Techstream, enter the key diagnostic mode to forcibly form the interior detection area. If the electrical key transmitter sub-assembly is brought near the area, short beeps sound (See page ).
Engine switch	Under normal operation, after the engine switch is pressed, "ON" is displayed for the Data List items "Start Switch1" and "Start Switch2".
Steering lock ECU (steering lock actuator or UPR bracket assembly)	If "OK" is displayed for the Data List item "L Code Check" when the engine switch is turned on (ACC), power will be supplied to the steering motor for approximately 10 seconds. Then the ECU sends an unlock signal to the steering motor and the Data List item "Unlock Request Receive" temporarily changes from "NG" to "OK". After the steering unlocks the ECU receives the unlocked signal from the steering motor and the Data List item "Steering Unlock" changes from "Unset" to "Set". In order to unlock the steering wheel, it is necessary that "OK" is displayed for the Data List item "L Code Check" (the ID code stored in the steering lock ECU (steering lock actuator or UPR bracket assembly) matches that of the certification ECU (smart key ECU assembly)).

HINT:

The electrical key transmitter sub-assembly, the transmitter battery and the vehicle battery have already been inspected in the previous operation steps. However, if they have not been inspected, inspect them.

(e) Operation 5

Operation	Depress the brake pedal with the shift lever in P while carrying an electrical key transmitter sub-assembly.
Expected operation of the vehicle	The smart warning light appear on the multi-information display. If it does not, the parts listed below may be malfunctioning.

Suspected Area	Diagnosis
Stop light switch assembly	If the brake pedal is depressed, "ON" is displayed for the Data List item "Stop Light Switch1".
Certification ECU (smart key ECU assembly)	Start function-Terminals of ECU (See page ).

(f) Operation 6

Operation

After getting into the vehicle while carrying the electrical key transmitter sub-assembly, press the engine switch with the shift lever in P while depressing the brake pedal.

Expected operation of the vehicle

The engine starts. If it does not, the parts listed below may be malfunctioning.

HINT:

If the engine switch is pressed with the steering wheel unlocked, 12 V will be supplied from terminal STAR of the certification ECU (smart key ECU assembly) to the ST relay.

Suspected Area	Diagnosis
Steering lock system	Under normal operation, the steering wheel will be unlocked and "ON" is displayed for the Data List item "Steering Unlock Switch".
Certification ECU (smart key ECU assembly)	The Data List item "Starter SW" is an instruction to operate the starter. If this turns "ON", 12 V will be supplied from terminal STAR of the certification ECU (smart key ECU assembly) to the ST relay.
Starter relay	The Data List item "Starter Relay" indicates the voltage at the STA terminal of the certification ECU (smart key ECU assembly). This indicates whether voltage is being supplied to the ST relay.
Starter	-
Vehicle Battery is discharged	Whether the vehicle battery is discharged or not can be checked easily by operating the horn.

(g) Operation 7

Operation	Press the engine switch.
Expected operation of the vehicle	The engine stops, the smart warning light illuminates green and then goes off and the security indicator light changes from off to blinking.

(h) Operation 8

Operation	Open any of the doors with the engine switch off.
Expected operation of the vehicle	The steering wheel locks. If it does not, the parts listed below may be malfunctioning.

Suspected Area	Diagnosis
Steering lock system	-
Door courtesy light switch assembly	When any of the doors are opened, "OFF" is displayed for the Data List item "FL Door Courtesy".

(i) Operation 9

Operation	Touch the lock sensor of the driver door outside handle while carrying the electrical key transmitter sub-assembly.
Expected operation of the vehicle	Answer back is performed at the same time when the doors are locked.

7. VEHICLE BATTERY SAVING FUNCTION

(a) When the smart key system is operating, the vehicle performs key detection operations every 0.25 seconds. Therefore, if the vehicle is left as is for a long period of time, the vehicle battery may become fully discharged. The following controls help reduce the rate at which the vehicle battery is discharged.

(1) If the smart key system is not operated for 5 days or more, periodic signal transmission from the electrical key antennas stops. However, the doors can still be unlocked by touching the unlock sensor of a front door outside handle assembly LH.

(2) If the smart key system is not operated for 14 days or more, the lock and unlock sensors of the front passenger door outside handle assembly are disabled. Therefore, only the unlock sensor of the front door outside handle assembly LH can be used to unlock the doors.

(3) If 10 minutes or more elapse while the electrical key transmitter sub-assembly is in an exterior detection area, the front door outside handle assembly LH (electrical key antenna) detecting the electrical key transmitter sub-assembly will stop operating.

(b) To restore operation of the smart key system, perform any of the following operations.

(1) While carrying the electrical key transmitter sub-assembly, touch the lock or unlock sensor of the front door outside handle assembly LH and perform a door lock or unlock operation.

(2) Lock or unlock the doors with the wireless operation.

(3) Insert the mechanical key into the door key cylinder of the driver door and lock or unlock the doors.

8. WIRELESS DOOR LOCK BUZZER VOLUME ADJUSTMENT FUNCTION

(a) The volume of the wireless door lock buzzer can be changed through the customize function.

HINT:

The volume of the following wireless door lock buzzer operations cannot be adjusted.

Warning function buzzer operations
Customize function buzzer operations
Buzzer operations for key diagnostic mode using the Techstream
Key registration buzzer operations

9. WARNING FUNCTION

(a) Warning

(1) Situation: The engine is left running and the shift lever is in a position other than P when the driver gets out of the vehicle.

There are 2 patterns for this situation.

Pattern 1:

When the engine is left running and the shift lever is in a position other than P, the driver opens the door and attempts to get out of the vehicle.

In this situation, the following control is performed:

Reason for warning	Sudden vehicle start, vehicle theft, vehicle roll-away
Warning Start Condition (All conditions are met)	The engine switch is on (ACC) or on (IG). The shift lever is in a position other than P. The driver door is opened. The vehicle speed is 0 mph (0 km/h).
Warning description	Buzzer in combination meter assembly sounds continuously. "Shift to P Position" is displayed on multi-information display in combination meter assembly.
Warning Stop Condition (One of conditions is met)	The engine switch is turned off. The shift lever is in P. The driver door is closed. The vehicle speed is 5 km/h (3.11 mph) or more.

Pattern 2:

Under the situation of pattern 1, the driver closes the door and attempts to leave the vehicle while holding the electrical key transmitter sub-assembly.

In this situation, the following control is performed:

Reason for warning	Sudden vehicle start, vehicle theft, vehicle roll-away
Warning Start Condition (All conditions are met)	The engine switch is on (ACC) or on (IG). The shift lever is in a position other than P. The driver door is opened → closed. The electrical key transmitter sub-assembly is not in the vehicle. The vehicle speed is 0 mph (0 km/h).
Warning description	Buzzer in combination meter assembly sounds continuously. Wireless buzzer sounds continuously. "Shift to P Position" is displayed on multi-information display in combination meter assembly for 60 seconds.[A] "Key Not Detected" is displayed on multi-information display in combination meter assembly.[B]
Warning Stop Condition (One of conditions is met)	The engine switch is turned off ([A] continues to be displayed). Electrical key transmitter sub-assembly is returned to the vehicle ([A] continues to be displayed). The vehicle speed is 5 km/h (3.11 mph) or more. ([B] continues to be displayed). The shift lever is in P ([B] continues to be displayed).

(2) Situation: The key reminder sounds.

When the driver door is open, the driver turns the engine switch on (ACC) and attempts to leave the vehicle.

Reason for warning	Vehicle theft
Warning Start Condition (All conditions are met)	Condition 1 The shift lever is in P. The engine switch is on (ACC). The driver door is opened.
Warning Start Condition (All conditions are met)	Condition 2 (Approval for one second or more) The shift lever is in P. The engine switch is off. The steering wheel is unlocked. The driver door is opened.
Warning description	Buzzer in combination meter assembly sounds continuously at short and even intervals.
Warning Stop Condition (One of conditions is met)	The warning is stopped when one of the following conditions is met: The engine switch is turned on (IG). The driver door is closed. The engine switch is turned off and the steering wheel is locked.

(3) Situation: The engine is left running with the shift lever in P when the driver gets out of the vehicle.

There are 2 patterns for this situation.

Pattern 1:

When the engine is left running with the shift lever in P, the driver closes the driver door and attempts to leave the vehicle while carrying the electrical key transmitter sub-assembly.

In this situation, the following control is performed:

Reason for warning	Vehicle theft
Warning Start Condition (All conditions are met)	The engine switch is on (ACC) or on (IG). The shift lever is in P. The driver door is opened → closed. The electrical key transmitter sub-assembly is not in the vehicle. The vehicle speed is 0 mph (0 km/h).
Warning description	Buzzer in combination meter assembly sounds once. Wireless buzzer sounds 3 times. "Key Not Detected" is displayed on multi-information display in combination meter assembly.
Warning Stop Condition (Either condition is met)	The engine switch is turned off. The electrical key transmitter sub-assembly is returned to the vehicle.

Pattern 2:

Under the situation of pattern 1, the driver touches the lock sensor on the door outside handle assembly.

In this situation, the following control is performed:

Reason for warning	Vehicle theft
Warning Start Condition (All conditions are met)	The engine switch is on (ACC) or on (IG). The shift lever is in P. The electrical key transmitter sub-assembly is not in the inside detection areas. The electrical key transmitter sub-assembly is in the outside detection areas. The lock sensor is on. The vehicle speed is 0 mph (0 km/h).
Warning description	Buzzer in combination meter assembly sounds once. Wireless buzzer sounds continuously. "Turn Power OFF" is displayed on multi-information display in combination meter assembly for 60 seconds.[A] "Key Not Detected" is displayed on multi-information display in combination meter assembly.[B]
Warning Stop Condition (One of conditions is met)	The engine switch is turned off. With the shift lever in P, the shift lever is moved to a position other than P ([B] continues to be displayed).1 The vehicle speed is 5 km/h (3.11 mph) or more. ([B] continues to be displayed). 5 seconds have elapsed after the wireless door lock buzzer is activated (only wireless buzzer stops). Any door is opened or closed (only wireless buzzer stops). Electrical key transmitter sub-assembly is returned to the vehicle ([A] continues to be displayed).

(4) Situation: The engine is left running when a passenger gets out of the vehicle while carrying the electrical key transmitter sub-assembly.

When the engine is left running, a passenger leaves the vehicle while carrying the electrical key transmitter sub-assembly.

In this situation, the following control is performed:

Reason for warning	Engine cannot be restarted
Warning Start Condition (All conditions are met)	The engine switch is on (ACC) or on (IG). A door other than the driver door is opened → closed. The electrical key transmitter sub-assembly is not in the vehicle. The vehicle speed is 0 mph (0 km/h).
Warning description	Buzzer in combination meter assembly sounds once. Wireless buzzer sounds 3 times. "Key Not Detected" is displayed on multi-information display in combination meter assembly.
Warning Stop Condition (Either condition is met)	The engine switch is turned off. The electrical key transmitter sub-assembly is returned to the vehicle.

(5) Situation: The electrical key transmitter sub-assembly is not in the detection areas.

When the electrical key transmitter sub-assembly is not in the vehicle or the transmitter battery is depleted, the driver attempts to start the engine or turn the engine switch on (IG).

In this situation, the following control is performed:

Reason for warning	Confuses the user
Warning Start Condition (All conditions are met)	A door is not unlocked using the mechanical key and the engine switch is pressed. The electrical key transmitter sub-assembly is not in the vehicle or the transmitter battery is depleted. The engine immobiliser system is set.
Warning description	Buzzer in combination meter assembly sounds once. "Key Not Detected" is displayed on multi-information display in combination meter assembly for 15 seconds.
Warning Stop Condition (Either condition is met)	The electrical key transmitter sub-assembly is returned to the vehicle. 30 seconds have elapsed after the door is opened

(6) Situation: The vehicle is driven without an electrical key transmitter sub-assembly.

When the vehicle starts moving without the registered electrical key transmitter sub-assembly in the vehicle.

In this situation, the following control is performed:

Reason for warning	Engine cannot be restarted
Warning Start Condition (All conditions are met)	The engine switch is on (IG). Warning of due to electrical key transmitter sub-assembly being brought out of vehicle is output. The vehicle speed is 5 km/h (3.11 mph) or more. The electrical key transmitter sub-assembly is not in the vehicle.
Warning description	Buzzer in combination meter assembly sounds nine times. "Key Not Detected" is displayed on multi-information display in combination meter assembly.
Warning Stop Condition (Either condition is met)	The engine switch is turned off. The electrical key transmitter sub-assembly is returned to the vehicle.

(7) Situation: The electrical key transmitter sub-assembly is left in the vehicle.

The lock sensor on a front door outside handle assembly LH is touched to perform entry lock with the electrical key transmitter sub-assembly left in the vehicle.

In this situation, the following control is performed:

Reason for warning	Vehicle theft
Warning Start Condition (All conditions are met)	The engine switch is off. All doors are closed. The electrical key transmitter sub-assembly is in the vehicle. The lock sensor on a front door outside handle assembly LH is on (touched). Any door is unlocked. The vehicle speed is 0 km/h (0 mph).
Warning description	Wireless buzzer sounds continuously for 5 seconds. "Key Detected in Vehicle" is displayed on multi-information display in combination meter assembly for 60 seconds.
Warning Stop Condition (One of conditions is met)	The engine switch is turned to a mode other than off. The vehicle speed is 5 km/h (3.11 mph) or more. Lock operation is detected. Any door is opened (only wireless buzzer stops).

(8) Situation: Door is ajar.

The lock sensor on the door outside handle assembly is touched to perform entry lock with a door open.

In this situation, the following control is performed:

Reason for warning	Vehicle theft
Warning Start Condition (All conditions are met)	The engine switch is off. The engine switch is on (ACC) or on (IG). Any door other than the door that performed the entry lock operation is open. The lock sensor on or lock switch is pressed on electrical key transmitter sub-assembly. The electrical key transmitter sub-assembly is in the outside detection areas.
Warning description	Wireless buzzer sounds continuously for 5 seconds.
Warning Stop Condition (One of conditions is met)	The engine switch is turned to a mode other than off. All doors are closed. An unlock operation is performed using the wireless door lock remote function. The touch sensor on the inner side of a door outside handle assembly is used to perform entry unlock.

(9) Situation: The electrical key transmitter sub-assembly is locked inside the vehicle.

With a door open and the electrical key transmitter sub-assembly in the vehicle, the lock knob is locked and then the door is closed with the door handle being pulled.

In this situation, the following control is performed:

Reason for warning	Vehicle theft
Warning Start Condition (All conditions are met)	With a door open, the lock knob is locked and then the door is closed with the door handle being pulled. The electrical key transmitter sub-assembly is in the vehicle. The vehicle speed is 0 km/h (0 mph).
Warning description	Buzzer in combination meter assembly sounds once. Wireless buzzer sounds continuously for 5 seconds. "Key Detected in Vehicle" is displayed on multi-information display in combination meter assembly for 60 seconds.
Warning Stop Condition (Any condition is met)	The engine switch is turned to a mode other than off. Any door is opened (only wireless buzzer stops). Lock operation is detected. The vehicle speed is 5 km/h (3.11 mph) or more.

(10) Situation: The transmitter battery is weak.

The vehicle is driven using an electrical key transmitter sub-assembly that has a low transmitter battery.

In this situation, the following control is performed:

Reason for warning	Usability function, engine cannot be restarted
Warning Start Condition (All conditions are met)	Condition 1 The engine switch is turned off after being left on (IG) for more than 20 minutes. The transmitter battery voltage is low. The electrical key transmitter sub-assembly is in the vehicle. The vehicle speed is 0 mph (0 km/h).
Warning Start Condition (All conditions are met)	Condition 2 The engine is off → the engine is started. The transmitter battery voltage is low. The electrical key transmitter sub-assembly is in the vehicle. The vehicle speed is 0 mph (0 km/h). Condition 1 is met.(past)
Warning description	Buzzer in combination meter assembly sounds once. "Key Battery Low" is displayed on multi-information display in combination meter assembly for 15 seconds.
Warning Stop Condition (Either condition is met)	The vehicle speed is 5 km/h (3.11 mph) or more. The transmitter battery is replaced with a new one.

(11) Situation: The steering wheel cannot be released.

The steering wheel cannot be released, thus the engine is prevented from starting.

The shift lever is moved to a position other than P before the steering wheel is unlocked.

In this situation, the following control is performed:

Reason for warning	Usability function
Warning Start Condition	Steering wheel cannot be unlocked.
Warning description	Buzzer in combination meter assembly sounds once. "Steering Lock ON" is displayed on multi-information display in combination meter assembly for 15 seconds.
Warning Stop Condition	Steering wheel is unlocked.

(12) Situation: The smart key system is malfunctioning. An IG circuit malfunction, vehicle speed signal malfunction or malfunction that interferes with steering lock ECU (steering lock actuator or UPR bracket assembly) operation, has been detected.

In this situation, the following control is performed:

Reason for warning	Malfunction detection
Warning Start Condition (One of conditions is met)	The steering lock ECU (steering lock actuator or UPR bracket assembly), driver of the certification ECU (smart key ECU assembly) or unlock detection switch is malfunctioning. An IG relay output circuit malfunction occurs three times or more consecutively. The vehicle speed is judged as abnormal or vehicle speed signal communication is malfunctioning.
Warning description	Buzzer in combination meter assembly sounds once. "Smart Entry & Start System Check" is displayed on multi-information display in combination meter assembly for 15 seconds.
Warning Stop Condition	The system returns to normal.

(13) Situation: The engine does not start. (Situation A)

When the engine switch is pressed, the electrical key transmitter sub-assembly cannot be detected in the vehicle two times in a row.

In this situation, the following control is performed:

Reason for warning	Usability function
Warning Start Condition (One of conditions is met)	The engine immobiliser system is set. The electrical key transmitter sub-assembly is not in the vehicle. Key code verification error occurs when the engine switch is pressed twice or the driver door key linked unlock operation is performed.
Warning description	Buzzer in combination meter assembly sounds once. "Key Battery Low Engine Start: Press Brake Pedal, Push Engine Switch with Key" is displayed on multi-information display in combination meter assembly for 60 seconds.
Warning Stop Condition (Either condition is met)	The electrical key transmitter sub-assembly is in the vehicle. 30 seconds have elapsed after the door is opened

(14) Situation: The engine does not start. (Situation B)

There are two patterns for this situation.

Pattern 1:

The engine might be started (when the driver gets in the vehicle, or the engine switch is turned on (ACC)).

In this situation, the following control is performed:

Possible effects without warning	Engine cannot be restarted
Warning Start Condition (Either condition is met)	After the doors are unlocked from outside the vehicle with the engine switch off, the driver door is opened. With the brake pedal not depressed, the engine switch is turned on (ACC).
Warning description (Not displayed while the opening image is displayed.)	"Engine Start: Press Brake Pedal and Push Engine Switch" is displayed on the multi-information display in the combination meter assembly.
Warning Stop Condition (One condition is met)	20 seconds have elapsed after the warning started. The engine speed is at 200 rpm or more. The doors are locked from outside the vehicle. The doors are locked by a wireless door lock operation from inside the vehicle.

Pattern 2:

The engine might be started (when the engine switch is on (IG)).

In this situation, the following control is performed:

Possible effects without warning	Engine cannot be restarted
Warning Start Condition (Either condition is met)	With the shift lever in P or N and the brake pedal not depressed, the engine switch is turned on (IG) (the engine is not started). The engine switch is on (IG) (the engine is not started) and the shift lever is moved from a position other than P or N to P or N.
Warning description	"Engine Start: Press Brake Pedal and Push Engine Switch" is displayed on the multi-information display in the combination meter assembly.
Warning Stop Condition (One condition is met)	The power source mode is changed to any mode other than on (IG). The vehicle speed is 5 km/h (3 mph) or more. The shift lever is moved to a position other than P or N.

(15) Situation: The engine switch cannot be turned off.

There are 2 patterns for this situation.

Pattern 1:

A warning message appears on the multi-information display when the driver attempts to turn the engine switch off with the shift lever in any position other than P or N.

In this situation, the following control is performed:

Reason for warning	Discharged vehicle battery, vehicle roll-away
Warning Start Condition	The engine switch is turned off with both conditions below met. Shift lever in any position other than P or N. Even though the engine switch is pressed, the power source mode does not change to off (excluding emergency stop operation).
Warning description	Buzzer in combination meter assembly sounds once. "Shift to P Position" is displayed on multi-information display in combination meter assembly.
Warning Stop Condition	The engine switch is turned to a mode other than ACC. The shift lever is moved to P.

Pattern 2:

Under the situation of pattern 1, the shift lever is moved to P.

In this situation, the following control is performed:

Reason for warning	Discharged vehicle battery, vehicle roll-away
Warning Start Condition	The shift lever is moved to P.
Warning description	Buzzer in combination meter assembly sounds once. "Turn Power OFF" is displayed on multi-information display in combination meter assembly.
Warning Stop Condition (Either condition is met)	The power source mode is changed to mode other than on (ACC). The shift lever in any position other than P.

(16) Situation: Auto power off operation occurs.

A warning message appears on the multi-information display when automatic power off operation occurs.

In this situation, the following control is performed:

Reason for warning	Vehicle battery saving function
Warning Start Condition (All conditions are met)	The shift lever is in P. The engine switch is on (ACC) or on (IG). The vehicle speed is 0 km/h (0 mph). The engine is stopped. The power source control system is turned off by automatic power off function.
Warning description	"Powering OFF to Conserve Battery" is displayed on multi-information display in combination meter assembly for 10 seconds.
Warning Stop Condition	The engine switch is on (ACC) or on (IG).

(17) Situation: Engine immobiliser system certification completion occurs.

When an electrical key transmitter sub-assembly with a depleted transmitter battery is held near to the engine switch while depressing the brake.

In this situation, the following control is performed:

Reason for warning	Malfunction detection
Warning Start Condition	Electrical key transmitter sub-assembly certification result is OK.
Warning description	Buzzer in combination meter assembly sounds once. "Engine Start: Press Brake Pedal and Push Engine Switch" is displayed on multi-information display in combination meter assembly for 10 seconds.
Warning Stop Condition (One of conditions is met)	The electrical key transmitter sub-assembly is detected to the vehicle. The engine is running at 500 rpm or more. The engine is started. The engine immobiliser system is set and room recognize is stopped or cannot be recognized.

How To Proceed With Troubleshooting

CAUTION / NOTICE / HINT HINT: Use these procedures to troubleshoot the smart key system (for Entry Function). *: Use the Techstream. PROCEDURE 1. VEHIC ...

Customize Parameters

CUSTOMIZE PARAMETERS 1. CUSTOMIZE SMART KEY SYSTEM (for Entry Function) HINT: The following items can be customized. NOTICE: When the customer requests a change in a function, first make ...

Other materials:

Installation
INSTALLATION CAUTION / NOTICE / HINT HINT: Perform "Inspection After Repairs" after replacing the engine assembly, cylinder head sub-assembly, camshaft, No. 2 camshaft, No. 3 camshaft sub-assembly, No. 4 camshaft sub-assembly, camshaft timing gear assembly, camshaft timing exhaust g ...

Open in Outer Mirror Indicator(Slave) (C1AB5)
DESCRIPTION This DTC is stored when the blind spot monitor sensor RH detects an open in the blind spot monitor indicator RH. DTC Code DTC Detection Condition Trouble Area C1AB5 With the blind spot monitor main switch assembly (warning ...

Installation
INSTALLATION PROCEDURE 1. INSTALL EXHAUST MANIFOLD SUB-ASSEMBLY LH (a) Install a new gasket to the cylinder head LH. NOTICE: Be careful of the installation direction. (b) Temporarily install the exhaust manifold sub-assembly LH with the 4 nuts. (c) Tighten the 4 nuts in the sequenc ...