No Answer-Back

DOOR LOCK: WIRELESS DOOR LOCK CONTROL SYSTEM: No Answer-Back
- No Answer-Back

DESCRIPTION

In some cases, wireless door lock control functions are normal but the turn signal lights and wireless door lock buzzer are not. Malfunctions may be present in the main body ECU (cowl side junction block LH), certification ECU (smart key ECU assembly), turn signal lights, and/or wireless door lock buzzer signal outputs.

NOTICE:
* Before performing the inspection, check that there are no problems related to the CAN communication system and LIN communication system.
* When troubleshooting a function, first make sure that the answer-back function is set to the default setting.
* Check that DTC B1242 is not output.
* When troubleshooting a function, first make sure that the open door warning function is set to the default setting.

WIRING DIAGRAM





INSPECTION PROCEDURE

PROCEDURE

1. CHECK WIRELESS DOOR LOCK FUNCTION

(a) Check that the wireless door lock control functions operate with a transmitter Operation Check.

Result





B -- CHECK HARNESS AND CONNECTOR (WIRELESS DOOR LOCK BUZZER - CERTIFICATION ECU AND BODY GROUND)
A -- Continue to next step.

2. CHECK HAZARD WARNING LIGHT

(a) Check that the turn signal lights flash continuously when the hazard warning signal switch is pressed Testing and Inspection.

OK:

Hazard warning lights flash continuously.

NG -- Go to PROBLEM SYMPTOMS TABLE (LIGHTING SYSTEM) Problem Symptoms Table

OK -- REPLACE MAIN BODY ECU (COWL SIDE JUNCTION BLOCK LH)

3. CHECK HARNESS AND CONNECTOR (WIRELESS DOOR LOCK BUZZER - CERTIFICATION ECU AND BODY GROUND)





(a) Disconnect the E29 ECU connector.

(b) Disconnect the A20 buzzer connector.

(c) Measure the resistance according to the value(s) in the table below.

Standard Resistance:





NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- Continue to next step.

4. CHECK WIRELESS DOOR LOCK BUZZER (OPERATION)

(a) Temporarily replace the wireless door lock buzzer with a new one Removal.

(b) Check that the wireless door lock buzzer sounds by using the transmitter lock/unlock switch.

OK:

Wireless door lock buzzer sounds.

NG -- REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) Removal

OK -- END (WIRELESS DOOR LOCK BUZZER IS DEFECTIVE)