B1129

DTC B1129: Driver's Door Lock Knob Switch Signal Error

NOTE: If you are troubleshooting multiple DTCs, be sure to follow the instructions in B-CAN system diagnosis test mode A.

1. Clear the DTCs with the HDS.
2. Turn the ignition switch OFF, and then back ON (II).
3. Operate the driver's door lock knob switch several times.
4. Check for DTCs with the HDS.

Is DTC B1129 indicated?

YES - Go to step 5.

NO - Intermittent failure. The driver's door lock knob switch system is OK at this time. Check pinfits and connections.

5. Select SECURITY from the BODY ELECTRICAL SYSTEM SELECT MENU, and enter the DATA LIST.

Check the ON/OFF information of the Driver's Door Lock knob Switch (LOCK) and Driver's Door Lock Knob Switch (UNLOCK) in the DATA LIST.

Does the Driver's Door Lock Knob Switch (LOCK) information indicator ON and Driver's Door Lock Knob Switch (UNLOCK) information indicate OFF with the driver's door lock knob switch in LOCK position, and does the Driver's Door Lock Knob Switch (LOCK) information indicate OFF and Driver's Door Lock Knob Switch (UNLOCK) information indicate ON with the driver's door lock knob switch in the UNLOCK position?

YES - Faulty door multiplex control unit; replace the power window master switch.

NO - Go to step 6.

6. Disconnect the driver's door lock knob switch 3P connector.
7. Check the ON/OFF information of the Driver's Door Lock Knob Switch (LOCK) and Driver's Door Lock Knob Switch (UNLOCK) in the DATA LIST.

Are both information indicators OFF?

YES - Check for an open in the driver's door lock knob switch (LOCK) wire or the driver's door lock knob switch (UNLOCK) wire between the door multiplex control unit and the driver's door lock knob switch. If OK, replace the driver's door lock actuator.

NO - Go to step 8.

8. Turn the ignition switch OFF.
9. Disconnect power window master switch connector A (22P).




10. Check for continuity between the No. 2 (LOCK) and No. 1 (UNLOCK) terminals of the driver's door lock knob switch 3P connector and body ground.

Is there continuity?

YES - Repair a short in the YEL/RED (LOCK) or WHT/BLK (UNLOCK) wire.

NO - Go to driver's door lock knob switch test. Door Lock Knob Switch Test If the driver's door lock knob switch is OK, the door multiplex control unit is faulty; replace the power window master switch.