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
B1242 - Wireless Door Lock Tuner Circuit Malfunction

DESCRIPTION

* The certification ECU decodes the requested smart key system operation by identifying a key code based on electric waves received via the door control receiver.

* The door control receiver receives a signal from the wireless door control transmitter and sends signals to the main body ECU through the certification ECU.

* The certification ECU then sends a command, according to the requested operation, to each ECU. (e.g. If door lock operation is requested, the ECU sends a door lock command to the main body ECU.)





WIRING DIAGRAM





INSPECTION PROCEDURE

PROCEDURE

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

(a) Disconnect the E58 certification ECU connector and O18 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. INSPECT CERTIFICATION ECU

(a) Reconnect the E58 ECU connector.





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

Standard voltage:





NG -- REPLACE CERTIFICATION ECU
OK -- Continue to next step.

3. REPLACE DOOR CONTROL RECEIVER

(a) Replace the door control receiver with a normal one.

(b) Perform the registration procedure.

OK:

The system returns to normal operation.

NG -- REPLACE CERTIFICATION ECU

OK -- END