DTC B1129: Driver's Door Lock Knob Switch Signal Error 1.
Clear the DTCs using the HDS.
2.
Cycle the ignition switch to OFF and then back ON.
3.
Operate the driver's door lock knob switch.
4.
Check for DTCs using 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 HDS, 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.
Is the Driver's Door Lock knob Switch (LOCK) information indicator ON and Driver's Door Lock knob Switch (UNLOCK) information indicator OFF with the door lock knob switch in LOCK position, and is the Driver's Door Lock knob Switch (LOCK) information indicator OFF and Driver's Door Lock knob Switch (UNLOCK) information indicator ON with the door lock knob switch in UNLOCK position?
YES - Intermittent failure, the door multiplex control unit (power window master switch) is OK at this time. Check pinfits and connections.
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 - Faulty driver's door lock knob switch.
NO - Go to step 8.
8.
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. If the driver's door lock knob switch is OK, the door multiplex control unit is faulty; replace the power window master switch.
