Wireless Door Lock Control System (w/o Smart Key System)

DOOR LOCK: WIRELESS DOOR LOCK CONTROL SYSTEM (w/o 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 within 1 second after the main body ECU outputs PRG signal.






WIRING DIAGRAM





INSPECTION PROCEDURE

PROCEDURE

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




(a) Disconnect the D4 receiver connector.
(b) Disconnect the B7 ECU connector.
(c) Measure the resistance and voltage of the wire harness side connectors.
Standard resistance:






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

2. 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.
NG -- REPLACE DRIVER SIDE JUNCTION BLOCK ASSEMBLY (MAIN BODY ECU)
OK -- END (DOOR CONTROL RECEIVER IS DEFECTIVE)