DESCRIPTION
The smart key system (for Entry Function) uses the wireless door lock buzzer to perform various vehicle exterior warnings. When the conditions of each warning are met, the certification ECU (smart key ECU assembly) sends a buzzer activation request signal to the main body ECU (multiplex network body ECU) via CAN communication and the buzzer sounds.
WIRING DIAGRAM
CAUTION / NOTICE / HINT
NOTICE:
PROCEDURE
1. |
CHECK CUSTOMIZE SETTING (WIRELESS BUZZER RESP) |
(a) Connect the Techstream to the DLC3.
(b) Turn the engine switch on (IG).
(c) Turn the Techstream on.
(d) Enter the following menus: Customize Setting / Wireless Door Lock.
Wireless Door Lock
Tester Display |
Default |
Description |
Setting |
ECU |
---|---|---|---|---|
Wireless Buzzer Resp |
ON |
Wireless buzzer response |
OFF or ON |
Main body ECU (multiplex network body ECU) |
Result |
Proceed to |
---|---|
"ON" is displayed |
A |
"OFF" is displayed |
B |
B | ![]() |
PERFORM CUSTOMIZE SETTING |
|
2. |
CHECK WIRELESS DOOR LOCK CONTROL SYSTEM |
(a) Check that the wireless door lock functions operate normally (See page
).
Result |
Proceed to |
---|---|
Wireless door lock function does not operate normally |
A |
Wireless door lock function operates normally |
B |
B | ![]() |
GO TO PROBLEM SYMPTOMS TABLE |
|
3. |
READ VALUE USING TECHSTREAM (EACH UNLOCK DETECTION SWITCH) |
(a) Connect the Techstream to the DLC3.
(b) Turn the engine switch on (IG).
(c) Turn the Techstream on.
(d) Enter the following menus: Body Electrical / Main Body / Data List.
(e) Read the Data List according to the display on the Techstream.
Main Body
Tester Display |
Measurement Item/Range |
Normal Condition |
Diagnostic Note |
---|---|---|---|
FR Door Lock Pos |
Front door RH unlock detection switch signal / UNLOCK or LOCK |
UNLOCK: Front door RH unlocked LOCK: Front door RH locked |
- |
FL Door Lock Pos |
Front door LH unlock detection switch signal / UNLOCK or LOCK |
UNLOCK: Front door LH unlocked LOCK: Front door LH locked |
- |
RR-Door Lock Pos SW*1 |
Rear door RH unlock detection switch signal / ON or OFF |
ON: Rear door RH or LH unlocked OFF: Rear door RH and LH locked |
- |
RL-Door Lock Pos SW*1 |
Rear door LH unlock detection switch signal / ON or OFF |
ON: Rear door RH or LH unlocked OFF: Rear door RH and LH locked |
- |
OK:
The Techstream display changes correctly in response to the lock/unlock operation.
NG | ![]() |
GO TO LIGHTING SYSTEM (PROCEED TO DOOR UNLOCK DETECTION SWITCH CIRCUIT) |
|
4. |
PERFORM ACTIVE TEST USING TECHSTREAM (WIRELESS BUZZER) |
(a) Connect the Techstream to the DLC3.
(b) Turn the engine switch on (IG).
(c) Turn the Techstream on.
(d) Enter the following menus: Body Electrical / Main Body / Active Test.
(e) Perform Active Test according to the display on the Techstream.
Main Body
Tester Display |
Measurement Item |
Control Range |
Diagnostic Note |
---|---|---|---|
Wireless Buzzer |
Wireless door lock buzzer |
OFF/ON |
- |
Result |
Proceed to |
---|---|
Wireless buzzer does not sound |
A |
Wireless buzzer sounds |
B |
B | ![]() |
REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) |
|
5. |
INSPECT WIRELESS DOOR LOCK BUZZER |
(a) Disconnect the wireless door lock buzzer connector.
(b) Perform the Active Test using the Techstream and sound the wireless door lock buzzer.
Main Body
Tester Display |
Measurement Item |
Control Range |
Diagnostic Note |
---|---|---|---|
Wireless Buzzer |
Wireless door lock buzzer |
OFF/ON |
- |
(c) While performing the Active Test, measure the voltage between the terminals of the wireless door lock buzzer. Standard Voltage:
|
|
OK | ![]() |
REPLACE WIRELESS DOOR LOCK BUZZER |
|
6. |
CHECK HARNESS AND CONNECTOR (WIRELESS DOOR LOCK BUZZER - MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU) AND BODY GROUND) |
(a) Remove the main body ECU (multiplex network body ECU) from the driver side
junction block (See page ).
(b) Reconnect the 1F driver side junction block connector.
(c) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
Tester Connection |
Condition |
Specified Condition |
---|---|---|
W3-1 - MB-21 (BZR) |
Always |
Below 1 Ω |
W3-2 - Body ground |
Always |
Below 1 Ω |
W3-1 or MB-21 (BZR) - Body ground |
Always |
10 kΩ or higher |
OK | ![]() |
REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU) |
|
7. |
CHECK HARNESS AND CONNECTOR (WIRELESS DOOR LOCK BUZZER - DRIVER SIDE JUNCTION BLOCK) |
(a) Disconnect the 1F driver side junction block connector.
(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
Tester Connection |
Condition |
Specified Condition |
---|---|---|
W3-1 - 1F-29 |
Always |
Below 1 Ω |
W3-1 or 1F-29 - Body ground |
Always |
10 kΩ or higher |
OK | ![]() |
REPLACE DRIVER SIDE JUNCTION BLOCK |
NG | ![]() |
REPAIR OR REPLACE HARNESS OR CONNECTOR |
Open Circuit in IG1/IG2 Power Source Circuit (C1242)
DESCRIPTION
If there is a problem with the skid control ECU (master cylinder solenoid) power
supply circuit, the skid control ECU outputs the DTC and prohibits operation under
the fail safe function.
If the voltage supplied to terminal IG1 and/or IG2 is not within the DTC detection
threshold ...
IG2 Signal Malfunction (B2788)
DESCRIPTION
This DTC is stored when the steering lock ECU (steering lock actuator or UPR
bracket assembly) detects an IG2 power supply malfunction.
HINT:
The steering lock ECU (steering lock actuator or UPR bracket assembly) is not
connected to the CAN communication system. However, the steer ...
Millimeter Wave Radar Sensor Communication Stop Mode
DESCRIPTION
Detection Item
Symptom
Trouble Area
Millimeter Wave Radar Sensor Communication Stop Mode
Either Condition is met:
Communication stop for "Front Radar" is indicated on the "Communication
Bus C ...