DTC Troubleshooting: B1129

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

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 ten times.

4.Check for DTCs with the HDS.

Is DTC B1129 indicated?


YES - Go to 5.


NO - Intermittent failure. The driver's door lock knob switch system is OK at this time.n


5.Select KEYLESS from the BODY ELECTRICAL menu, and enter the DATA LIST.

6.Check the ON/OFF information of the DRIVER'S DOOR LOCK KNOB SWITCH (LOCK) and the DRIVER'S DOOR LOCK KNOB SWITCH (UNLOCK).

Does the DRIVER'S DOOR LOCK KNOB SWITCH (LOCK) information indicator ON and DRIVER'S DOOR LOCK KNOB SWITCH (UNLOCK) information indicator OFF with the driver's door lock knob switch in LOCK position, and does the DRIVER'S DOOR LOCK KNOB SWITCH (LOCK) information indicator OFF and DRIVER'S DOOR LOCK KNOB SWITCH (UNLOCK) information indicator ON with the driver's door lock knob switch in UNLOCK position?


YES - Faulty MICU, replace the under-dash fuse/relay box.n


NO - Go to 7.


7.Disconnect the driver's door lock actuator 10P 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 MICU and the driver's door lock knob switch. If OK, replace the driver's door lock actuator.n


NO - Go to 9.


9.Turn the ignition switch OFF.

10.Disconnect the under-dash fuse/relay box connector T (34P).

11.Check for continuity between the No. 23 (UNLOCK) and No. 24 (LOCK) terminals of the under-dash fuse/relay box connector T (34P) and body ground.

 

Is there continuity?


YES - Repair a short in the LOCK or UNLOCK wire.n


NO - Go to 12.

12.Check for continuity between the No. 23 (UNLOCK) and No. 24 (LOCK) terminals of the under-dash fuse/relay box connector T (34P).

 

Is there continuity?


YES - Repair a short in the wire between the LOCK wire and UNLOCK wire.n


NO - Faulty MICU, replace the under-dash fuse/relay box.n