Wireless Door Lock Control System

DOOR LOCK: WIRELESS DOOR LOCK CONTROL SYSTEM: B1242: Wireless Door Lock Tuner Circuit Malfunction

DTC B1242 - Wireless Door Lock Tuner Circuit Malfunction

DESCRIPTION

- The electrical key antenna is used to receive electric waves relating to the entry functions of the smart access system with push-button start. The certification ECU decodes the requested smart access system with push-button start operation by identifying a key code based on electric waves received via the electrical key antenna and 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 RH 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 RH.)





WIRING DIAGRAM





INSPECTION PROCEDURE

PROCEDURE

1. CHECK HARNESS AND CONNECTOR (CERTIFICATION ECU - DOOR CONTROL RECEIVER)
(a) Disconnect the P33 certification ECU connector and P31 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 P33 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 normal one
(b) Perform the registration procedure.
OK:
The system returns to normal operation.
NG -- REPLACE CERTIFICATION ECU
OK -- END