Honda HR-V: DTC B1279 Dimmer 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
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.
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.
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.
- Turn the vehicle to the ON mode.
- Check the parameter(s) below with the HDS.
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.
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.
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 (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 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 (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:
NOTE:
Check the vehicle 12 volt battery condition first.
Check for aftermarket accessories plugged into the vehicle accessory
power sockets.
Check the radio reception in an open area. Compare it to a known-good
vehicle whenever possible. Poor reception/interference can be caused by the
fol
NOTE:
Check the vehicle 12 volt battery condition first.
This is not the same condition as when driving off-road (or on a fire or
logging road).
This condition is caused by a loss of map matching from a bad sensor
input. Check for aftermarket or other objects that can block the GPS signal.