B1129

Control System DTCs

DTC Troubleshooting: B1129

DTC B1129 : Driver's Door Lock Knob Switch Input Circuit Malfunction (Simultaneous Input of Lock and Unlock Signal)

NOTE: Refer to the Electrical Wiring Diagrams for the location of the under-dash fuse/relay box connectors.

1. Keyless/power door locks/security system check 1:

-1. With the driver's door lock knob switch in the lock position, check the parameter(s) below with the HDS.





Are both information indicators ON?
-YES- Go to step 2.
-NO- Intermittent failure, the system is OK at this time.

2. Determine possible failure area (driver's door latch, others):

-1. Turn the ignition switch to LOCK (0).

-2. Disconnect the following connector.





-3. Check the parameter(s) below with the HDS.





Is either information indicator ON?
-YES- Go to step 3.
-NO- Faulty driver's door knob switch; replace the driver's door latch Service and Repair.

3. Shorted wire check (DR SILCON UNLOCK, DR SILCON LOCK lines):

-1. Turn the ignition switch to LOCK (0).

-2. Disconnect the following connector.





-3. Check for continuity between test points 1 and 2 individually.














Is there continuity?
-YES- Repair a short to ground in the wire.
-NO- The DR SILCON UNLOCK and DR SILCON LOCK wires are OK. Faulty MICU; replace the under-dash fuse/relay box Under-Dash Fuse/Relay Box Removal and Installation.