B1242

DOOR LOCK: WIRELESS DOOR LOCK CONTROL SYSTEM: B1242: Wireless Door Lock Tuner Circuit Malfunction

DTC B1242 - Wireless Door Lock Tuner Circuit Malfunction

DESCRIPTION

The door control receiver receives signals from the transmitter and sends these signals to the main body ECU.





WIRING DIAGRAM





INSPECTION PROCEDURE

PROCEDURE

1. CHECK HARNESS AND CONNECTOR (MAIN BODY ECU - DOOR CONTROL RECEIVER)




(a) Disconnect the H3 main body ECU connector and the O25 door control receiver connector.
(1) Measure the resistance according to the value(s) in the table below.

Standard Resistance:





(b) Reconnect the main body ECU connector and the door control receiver connector.

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

2. CHECK HARNESS AND CONNECTOR (BATTERY, BODY GROUND)
(a) Disconnect the O25 door control receiver connector.




(b) Measure the voltage and resistance according to the value(s) in the table below.

Standard Resistance:





Standard Voltage:





(c) Reconnect the door control receiver connector.

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

3. REPLACE DOOR CONTROL RECEIVER
(a) Replace the door control receiver with a normal one Removal.

HINT: If a normally functioning door control receiver is available, connect it and check if the wireless door lock function is normal or DTCs are output. If the alternative receiver functions normally, replace the original door control receiver.

NEXT -- Continue to next step.

4. REGISTER RECOGNITION CODE
(a) Perform the registration procedures Registration.
NEXT -- Continue to next step.

5. CLEAR DTC
(a) Clear the DTCs Reading and Clearing Diagnostic Trouble Codes.
NEXT -- Continue to next step.

6. CONFIRM DTC
(a) Check if the same DTC is detected.

HINT: Reinstall the sensors, connectors, etc. and restore the previous vehicle conditions before rechecking for DTCs.

OK:
DTC is not output.

NG -- REPLACE MAIN BODY ECU
OK -- END (DOOR CONTROL RECEIVER DEFECTIVE)