Honda HR-V: DTC B1279 Dimmer Switch Circuit Malfunction
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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. Exterior lights system check 1:
- With the headlight dimmer switch in the neutral position, check the parameter(s) below with the HDS.
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Is either information indicator ON?
YES
Go to step 4.
NO
Go to step 2.
2. Exterior lights system check 2:
- With the headlight dimmer switch in the high beam position, check the parameter(s) below with the HDS.
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Are both information indicators ON?
YES
Go to step 3.
NO
Intermittent failure, the system is OK at this time.
3. Shorted wire check (H/L HI SW to PASSING SW line):
- Turn the vehicle to the OFF (LOCK) mode.
- Disconnect the following connector.
Combination light switch 12P connector
- Connect terminals A and B with a jumper wire.
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- Turn the vehicle to the ON mode.
- Check the parameter(s) below with the HDS.
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Are both information indicators ON?
YES
Repair a short between the wires.
NO
The H/L HI SW to PASSING SW wire is OK. Replace the combination light switch.
4. Determine possible failure area (combination light switch, others):
- Turn the vehicle to the OFF (LOCK) mode.
- Disconnect the following connector.
Combination light switch 12P connector
- Turn the vehicle to the ON mode.
- Check the parameter(s) below with the HDS.
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Is either information indicator ON?
YES
Go to step 5.
NO
Replace the combination light switch.
5. Shorted wire check (PASSING SW, H/L HI SW lines):
- Turn the vehicle to the OFF (LOCK) mode.
- Disconnect the following connector.
Under-dash fuse/relay box connector B (20P)
- Check for continuity between test points 1 and 2 individually.
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Are there continuity?
YES
Repair a short to ground in the wire.
NO
The PASSING SW and H/L HI SW wires are OK. Faulty MICU; replace the under-dash fuse/relay box .
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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
Diagn
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NOTE : If you are troubleshooting multiple DTCs, be sure to follow the
instructions in B-CAN System
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DTC U1280 (MICU) B-CAN Communication Bus Line Error (BUS-OFF)
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
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SEE MORE:
Interior Trim Removal and Installation - Pillar Areas (With Side Curtain
Airbag)
Removal & Installation
NOTE :
SRS components are located in this area. Review the SRS component
locations - Refer to: SRS
Component Location Index (KA/KC), or SRS Component Location Index (KA/KC)
and the
precautions and procedures before doing repairs or service.
If side airbags and/or
Break-in Procedure
* PLEASE READ THIS FIRST *
NOTE: Examples used in this article are general in nature and do not
necessarily relate
to a specific engine or system. Illustrations and procedures have been chosen
to guide mechanic through engine overhaul process. Descriptions of processes
of cleaning, inspection, asse
