B1242

DOOR LOCK: WIRELESS DOOR LOCK CONTROL 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.






WIRING DIAGRAM





INSPECTION PROCEDURE

PROCEDURE

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




(a) Disconnect the D33 main body ECU connector.
(b) Disconnect the J13 door control receiver connector.
(c) Measure the resistance.
Standard resistance:





(d) Reconnect the main body ECU connector.
(e) Reconnect the door control receiver connector.
NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- Continue to next step.
2. INSPECT DOOR CONTROL RECEIVER (+B TERMINAL)
(a) Disconnect the J13 door control receiver connector.




(b) Measure the voltage.
Standard voltage:





(c) Reconnect the door control receiver connector.
NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR (+B CIRCUIT)
OK -- Continue to next step.
3. INSPECT DOOR CONTROL RECEIVER (GND TERMINAL)
(a) Disconnect the J13 door control receiver connector.




(b) Measure the resistance.
Standard resistance:





(c) Reconnect the door control receiver connector.
NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR (E CIRCUIT)
OK -- Continue to next step.
4. REPLACE DOOR CONTROL RECEIVER
(a) Replace the door control receiver.
(b) Perform the REGISTRATION procedures Programming and Relearning.
HINT: If a new or normal functioning door control receiver is available, connect it and check if the wireless door lock function is normal or the DTC is output. If the alternative receiver functions normally, replace the original door control receiver.

NEXT -- Continue to next step.
5. RECHECK DTC
(a) Clear the DTC.
(b) Check if the same DTC is detected.
HINT: Reinstall the parts, such as sensors and connectors, and restore the vehicle to its previous conditions before rechecking for DTCs.

Result:





C -- PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE
B -- END
A -- REPLACE MAIN BODY ECU