W/O Smart Key System

DOOR LOCK: WIRELESS DOOR LOCK CONTROL SYSTEM (w/o Smart Key System): B1242: Wireless Door Lock Tuner Circuit Malfunction
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 E61 main body ECU connector and the M12 door control receiver connector.





(b) 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.

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

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





Standard:





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) Check if the same DTC is detected.

Result:





B -- REPLACE MAIN BODY ECU (INSTRUMENT PANEL JUNCTION BLOCK)

A -- END (DOOR CONTROL RECEIVER IS DEFECTIVE)