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

Toyota Tacoma (2015-2018) Service Manual / Door Lock / Wireless Door Lock Control System(w/ Smart Key System) / System Description

SYSTEM DESCRIPTION

1. WIRELESS DOOR LOCK CONTROL SYSTEM

The wireless door lock control system can be used to lock and unlock all doors from a distance. The system is controlled by an electrical key transmitter sub-assembly which sends radio waves to the door control receiver. The certification ECU (smart key ECU assembly) performs an ID code identification process and engages the door lock control.

2. MULTI CHANNEL FUNCTION

The wireless door lock control system has a multi-channel function. Each time the switch on the electrical key transmitter sub-assembly is pressed, the channel is switched alternately between 2 different frequencies and the signal is sent to the door control receiver.

3. FUNCTION OF MAIN COMPONENTS

Component	Function
Electrical key transmitter sub-assembly	Has lock, unlock, and panic switches. Transmits weak radio waves (recognition codes and function codes) to the door control receiver. Illuminates the indicator light (LED) during transmission.
Door control receiver	Receives weak radio waves from the electrical key transmitter sub-assembly and sends them to the certification ECU (smart key ECU assembly).
Front door courtesy light switch assembly LH/RH Rear door courtesy light switch assembly LH/RH1 Upper access panel lock assembly LH/RH2 Lower access panel lock assembly LH/RH*2	Turns on when a door is opened and turns off when it is closed. Outputs door status signals (open or closed) to the main body ECU (multiplex network body ECU).
Front door lock assembly LH/RH Rear door lock assembly LH/RH*1	Built-in motor locks or unlocks door. Transmits the door lock position of each door to the main body ECU (multiplex network body ECU).
Certification ECU (Smart key ECU assembly)	Sends wireless door lock control signals in response to the code data from the door control receiver and signals from each ECU.

*1: for Double Cab
*2: for Access Cab

4. SYSTEM FUNCTION

The electrical key transmitter sub-assembly has the lock, unlock, and panic switches. Operating these switches activates each function.

The wireless door lock control system has the following functions:

HINT:

The default settings of the following functions are on. Part of these functions can be customized (See page ).

Function	Operation
All door lock	Pressing the lock switch locks all doors.
All door unlock (Unlock 2 operation)	Pressing the unlock switch twice within 5 seconds unlocks all doors after the driver door is unlocked.
Automatic lock	If none of the doors is opened within 60 seconds after they are unlocked by the wireless door lock control, all doors will lock again automatically.
Answer back (Hazard warning light)	When the doors are locked by wireless operation, the hazard warning lights flash once. When the doors are unlocked by wireless operation, the hazard warning lights flash twice.
Answer back (Wireless door lock buzzer)	When the doors are locked by wireless operation, the wireless door lock buzzer sounds once. When the doors are unlocked by wireless operation, the wireless door lock buzzer sounds twice.
Panic alarm	Pressing the panic switch of the electrical key transmitter sub-assembly for longer than about 0.8 seconds causes the following alarms to activate: Sound the vehicle horns. Blinks the hazard warning lights. Illuminates the interior lights. While the panic alarm is operating, pressing any switch of the electrical key transmitter sub-assembly cancels the alarm operation.
Door ajar warning	The buzzer sounds when the lock switch is pressed when any of the doors are ajar, and it sounds for 5 seconds continuously. The buzzer stops when all doors are closed or the unlock switch is pressed.
Illuminated entry	When all doors are locked, pressing the unlock switch causes the interior lights to come on simultaneously with the unlock operation.
Self-diagnostic mode	The following are conditions to enter self-diagnostic mode: If the door control receiver receives normal radio waves from the electrical key transmitter sub-assembly when the system is in diagnostic mode, it sounds the wireless door lock buzzer in a normal pattern that corresponds to the function of each switch.

How To Proceed With Troubleshooting

CAUTION / NOTICE / HINT HINT: The wireless door lock control system troubleshooting procedure is based on the premise that the power door lock control system is operating normally. C ...

System Diagram

SYSTEM DIAGRAM Communication Table Transmitting ECU (Transmitter) Receiving ECU (Receiver) Signal Line Certification ECU (Sma ...

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