DTC B1129: Driver's door knob switch input Circuit Malfunction (Simultaneous input of lock and unlock signal)

NOTE:  If you are troubleshooting multiple DTCs, be sure to follow the instructions in B-CAN System Diagnosis Test Mode A - Refer to: Body Electrical Troubleshooting - B-CAN System Diagnosis Test Mode A - Initial Communication and DTC ChecksBody Electrical Troubleshooting - B-CAN System Diagnosis Test Mode 1 and Test Mode 2 (without the HDS)Body Electrical Troubleshooting - B-CAN System Diagnosis Test Mode B - Control Unit Not CommunicatingBody Electrical Troubleshooting - B-CAN System Diagnosis Test Mode C - No DTCs and Output Won't Shut OFFBody Electrical Troubleshooting - B-CAN System Diagnosis Test Mode D - No DTCs and Output Won't Turn ON .

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.

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

  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 vehicle to the OFF (LOCK) mode.

  2. Disconnect the following connector.

  Driver's door latch 10P connector

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

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

  Is either information indicator ON?

  YES 

  Go to step 3.

  NO 

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

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

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

  2. Disconnect the following connector.

  Under-dash fuse/relay box connector X (10P)

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

  Test condition	Vehicle OFF (LOCK) mode Driver's door latch 10P connector: disconnected Under-dash fuse/relay box connector X (10P): disconnected
  Test point 1	Under-dash fuse/relay box connector X (10P) No. 4
  Test point 2	Body ground

  Test point 1	Under-dash fuse/relay box connector X (10P) No. 5
  Test point 2	Body ground

  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 .