B1129

DTC Troubleshooting: B1129

DTC B1129:

Driver's Door Lock Knob Switch Malfunction

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

1. Clear the DTCs with the HDS.

2. Turn the ignition switch to LOCK (0) and then back to 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 system is OK at this time. Check for loose or poor connections.�

5. Select SECURITY from the BODY ELECTRICAL SYSTEM SELECT menu, and enter 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 Power Window Master Switch Replacement.�

NO -

Go to step 6.

6. Remove the driver's door panel Service and Repair.

7. Disconnect the driver's door lock knob switch 3P connector.

8. 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 9.

9. Turn the ignition switch to LOCK (0).

10. Disconnect the power window master switch 23P connector.

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





Is there continuity?

YES -

Repair a short to ground in the wire.�

NO -

Faulty door multiplex control unit; replace the power window master switch Power Window Master Switch Replacement.�