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 .
READ NEXT:
DTC B1280 Turn Signal Switch Circuit Malfunction
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
Diagn
DTC B1281, B1282, B1283, B1284 Front Wiper Position Circuit
Malfunctions
DTC Troubleshooting: B1281, B1282, B1283, B1284
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
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
Diagn
SEE MORE:
Keyless/Power Door Locks/Security System Symptom Troubleshooting - The Horn
Does Not Sound And/Or The Headlights Do Not Flash When The Panic Button On The
Remote Is Pressed
NOTE: Before troubleshooting, check the B-CAN DTCs. If any DTC is indicated,
troubleshoot the indicated
DTC first.
1. Determine possible failure area (MICU, others):
Press the PANIC button.
Do the horns sound?
YES
Go to step 3.
NO
Go to step 2.
2. Horn operation check:
Press the horn button.
DTC Troubleshooting 86-12, 86-13, 86-14, 86-16, 86-19, 86-21, 86-22: F-CAN
Communication Malfunction
NOTE:
Before you troubleshoot, review the general troubleshooting information.
Refer to the DTC code shown on the display, and then inspect the
connectors and terminals based on the
instructions in the table below.
The DTC may be stored due to loss of voltage supply or ground at the
transmi
