Honda HR-V: DTC B1275, B1276, B1277, B1278 : Headlight Malfunctions

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. Problem verification:

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

When the combination light switch is turned OFF

When the combination light switch is turned to POSITION (PARKING)

When the combination light switch is turned to AUTO

When the combination light switch is turned ON (HEADLIGHT)

Are all data list values correct?

YES

Intermittent failure, the system is OK at this time. Check for loose or poor connections.

NO

Go to step 2.

2. Exterior lights system check:

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

Cycle through all switch selections

Is any data list value OFF, not ON?

YES

Go to step 5.

NO

Go to step 3.

3. Determine possible failure area (combination light switch, others):

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

Combination light switch 12P connector

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

Are all data lists values OFF?

YES

Replace the combination light switch.

NO

Go to step 4.

4. Shorted wire check (H/L OFF SW, H/L ON SW, PARKING LT SW lines):

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

Under-dash fuse/relay box connector B (20P)

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 H/L OFF SW, H/L ON SW, and PARKING LT SW wires are OK. Faulty MICU; replace the underdash fuse/relay box.

5. Determine possible failure area (combination light switch, others):

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

Combination light switch 12P connector

3. Connect terminals A and B with a jumper wire.

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

Has the data list value changed from OFF to ON?

YES

Replace the combination light switch.

NO

Go to step 6.

6. Open wire check (H/L OFF SW, H/L ON SW, PARKING LT SW, COMBI SW GND (LT) lines):

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

Under-dash fuse/relay box connector B (20P)

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

Is there continuity?

YES

The H/L OFF SW, H/L ON SW, PARKING LT SW, and COMBI SW GND (LT) wires are OK. Faulty MICU; replace the under-dash fuse/relay box.

NO

Repair an open or high resistance in the wire.

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