DTC B1129: Driver's Door Lock Knob Switch Malfunction

DTC (Door Multiplex Control Unit)

• 1. Power window motor pulse check 1:

  1. Clear the DTCs with the HDS.

  2. Operate the driver's door lock knob switch several times.

  3. Check for DTCs with the HDS.

  DTC Description	DTC
  B1129 Driver's Door Lock Knob Switch Malfunction

  Is DTC B1129 indicated?

  YES 

  Go to step 2.

  NO 

  Intermittent failure, the system is OK at this time.

• 2. Determine possible failure area (DR SILCON UNLOCK, DR SILCON LOCK lines):

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

  Signal	Current conditions
  	Values	Unit
  Driver's Door Lock Knob Switch(UNLOCK)

  Is the DRIVER'S DOOR LOCK KNOB SWITCH (UNLOCK) information indicator ON?

  YES 

  Go to step 5.

  NO 

  Go to step 3.

• 3. Shorted wire check (DR SILCON LOCK line):

  1. Turn the vehicle to the OFF (LOCK) mode.

  2. Disconnect the following connectors.

  Driver's door latch 10P connector Power window master switch 37P connector

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

  Test condition	Vehicle OFF (LOCK) mode Driver's door latch 10P connector Power window master switch 37P connector
  Test point 1	Power window master switch 37P connector No. 33 - Refer to: Power Window Master Switch Input Test(Without Door Multiplex Control Unit)Power Window Master Switch Input Test(With Door Multiplex Control Unit)
  Test point 2	Body ground

  Is there continuity?

  YES 

  Repair a short to ground in the wire.

  NO 

  The DR SILCON LOCK wire is not shorted to ground. Go to step 4.

• 4. Shorted wire check (DR SILCON UNLOCK line to DR SILCON LOCK line):

  1. Turn the ignition switch to LOCK (0), or press the engine start/stop button to select the OFF mode.

  2. Check for continuity between test points 1 and 2.

  Test condition	Vehicle OFF (LOCK) mode Driver's door latch 10P connector Power window master switch 37P connector
  Test point 1	Power window master switch 37P connector No. 32 - Refer to: Power Window Master Switch Input Test(Without Door Multiplex Control Unit)Power Window Master Switch Input Test(With Door Multiplex Control Unit)
  Test point 2	Power window master switch 37P connector No. 33 - Refer to: Power Window Master Switch Input Test(Without Door Multiplex Control Unit)Power Window Master Switch Input Test(With Door Multiplex Control Unit)

  Is there continuity?

  YES 

  Repair a short in DR SILCON UNLOCK wire to DR SILCON LOCK wire.

  NO 

  Faulty driver's door lock knob switch; replace the driver's door latch .

• 5. Shorted wire check (DR SILCON UNLOCK line):

  1. Turn the vehicle to the OFF (LOCK) mode.

  2. Disconnect the following connectors.

  Driver's door latch 10P connector Power window master switch 37P connector

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

  Test condition	Vehicle OFF (LOCK) mode Driver's door latch 10P connector Power window master switch 37P connector
  Test point 1	Power window master switch 37P connector No. 32 - Refer to: Power Window Master Switch Input Test(Without Door Multiplex Control Unit)Power Window Master Switch Input Test(With Door Multiplex Control Unit)
  Test point 2	Body ground

  Is there continuity?

  YES 

  Repair a short to ground in the wire.

  NO 

  The DR SILCON UNLOCK wire is not shorted to ground. Go to step 6.

• 6. Shorted wire check (DR SILCON UNLOCK line to DR SILCON LOCK line):

  1. Turn the vehicle to the OFF (LOCK) mode.

  2. Check for continuity between test points 1 and 2.

  Test condition	Vehicle OFF (LOCK) mode Driver's door latch 10P connector Power window master switch 37P connector
  Test point 1	Power window master switch 37P connector No. 32 - Refer to: Power Window Master Switch Input Test(Without Door Multiplex Control Unit)Power Window Master Switch Input Test(With Door Multiplex Control Unit)
  Test point 2	Power window master switch 37P connector No. 33 - Refer to: Power Window Master Switch Input Test(Without Door Multiplex Control Unit)Power Window Master Switch Input Test(With Door Multiplex Control Unit)

  Is there continuity?

  YES 

  Repair a short in DR SILCON UNLOCK wire to DR SILCON LOCK wire.

  NO 

  Faulty driver's door lock knob switch; replace the driver's door latch .