Wireless Door Lock Control System (W/ Smart Key System)

DOOR LOCK: WIRELESS DOOR LOCK CONTROL SYSTEM (w/ Smart Key System): B1242: Wireless Door Lock Tuner Circuit Malfunction

DTC B1242 - Wireless Door Lock Tuner Circuit Malfunction

DESCRIPTION

This DTC is detected when a RDA signal is not input to the door control receiver through the certification ECU within 1 second after the main body ECU outputs a PRG signal.






WIRING DIAGRAM





INSPECTION PROCEDURE

PROCEDURE

1. CHECK WIRE HARNESS (DOOR CONTROL RECEIVER - CERTIFICATION ECU AND BODY GROUND)




(a) Disconnect the D4 receiver connector.
(b) Disconnect the S11 ECU connector.
(c) Measure the resistance of the wire harness side connectors.
Standard resistance:






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

2. CHECK WIRE HARNESS (CERTIFICATION ECU - MAIN BODY ECU AND BODY GROUND)




(a) Disconnect the S11 and B7 ECU connectors.
(b) Measure the resistance of the wire harness side connectors.
Standard resistance:






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

3. CHECK DOOR CONTROL RECEIVER (OPERATION)
(a) Temporarily replace the door control receiver with a new or normally functioning one.
(b) Check that no DTC is output.
OK:
DTC is not output.
OK -- END (DOOR CONTROL RECEIVER IS DEFECTIVE)
NG -- Continue to next step.

4. CHECK CERTIFICATION ECU (OPERATION)
(a) Temporarily replace the certification ECU with a new or normally functioning one.
(b) Check that no DTC is output.
OK:
DTC is not output.
NG -- REPLACE DRIVER SIDE JUNCTION BLOCK ASSEMBLY (MAIN BODY ECU)
OK -- END (CERTIFICATION ECU IS DEFECTIVE)