Faulty relay control module, replace the under-hood fuse/relay box See: Maintenance/Fuses and Circuit Breakers/Fuse Block/Service and
Repair/Under-Hood Fuse/Relay Box Removal and Installation.?
NO -
Repair an open in the wire or poor ground (G202).?
B1078
DTC Troubleshooting: B1078, B1079
DTC B1078:
Daytime Running Lights System Error (Canada)
DTC B1079:
Daytime Running Lights System Error (USA)
NOTE: If you are troubleshooting multiple DTCs, be sure to follow the instructions in B-CAN System Diagnosis Test Mode A See: Powertrain
Management/Computers and Control Systems/Information Bus/Testing and Inspection/Component Tests and General Diagnostics/Troubleshooting
- B-CAN System Diagnosis Test Mode A.
1. Turn the headlight switch OFF, and apply the parking brake.
2. Turn the ignition switch to ON (II).
3. Clear the DTCs with the HDS.
4. Release the parking brake.
5. Turn the ignition switch to LOCK (0) and then back to ON (II).
6. Check for DTCs with the HDS.
Is DTC B1078 or B1079 indicated?
YES -
Go to step 7.
NO -
Intermittent failure, the system is OK at this time. Check for loose or poor connections.?
7. Turn the ignition and headlight switches OFF.
8. Check the No. 1 (10 A) and No. 2 (10 A) fuses in the under-hood fuse/relay box.
Are the fuses OK?
YES -
Go to step 9.
NO -
Replace the blown fuse and recheck. If the fuse blows again, repair short in the wire between the under-hood fuse/relay box and the appropriate
daytime running lights.?
9. Check the daytime running light bulbs.
Are the daytime running light bulbs OK?
YES -
Go to step 10.
NO -
Replace the faulty bulb.?
10. Disconnect under-hood fuse/relay box connector G (4P).
