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

The door control receiver receives signals from the transmitter and sends these signals to the main body ECU (driver side junction block assembly).





WIRING DIAGRAM





INSPECTION PROCEDURE

PROCEDURE

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




(a) Disconnect the D49 main body ECU connector and the M15 door control receiver connector.
(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance:





Text in Illustration





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

2. CHECK HARNESS AND CONNECTOR (BATTERY, BODY GROUND)




(a) Measure the voltage and resistance according to the value(s) in the table below.
Standard:





Text in Illustration





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

3. REPLACE DOOR CONTROL RECEIVER
(a) Temporarily replace the door lock control receiver with a new or known good one Removal.
NEXT -- Continue to next step.

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

5. CONFIRM DTC
(a) Clear the DTCs Wireless Door Lock Control System (w/o Smart Key System).
(b) Recheck for DTCs.
Result:





B -- REPLACE MAIN BODY ECU (DRIVER SIDE JUNCTION BLOCK ASSEMBLY)
A -- END (DOOR CONTROL RECEIVER WAS DEFECTIVE)