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

DTC (MICU)

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 Checks,.

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

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 vehicle to the OFF (LOCK) mode.
2. Disconnect the following connector.

Driver's door latch 10P connector

3. Turn the vehicle to the ON mode.
4. Check the parameter(s) below with the HDS.

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 D (24P)

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

Is there continuity?

YES

Repair a short to ground in the wire(s).

NO

The DR SILCON UNLOCK and DR SILCON LOCK wires are OK. Faulty MICU; replace the underdash fuse/relay box.

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