B1078
DTC Troubleshooting: B1078
DTC B1078:
Daytime Running Lights Signal Error (Canada models)
NOTE: If you are troubleshooting multiple DTCs, be sure to follow the instructions in B-CAN System Diagnosis Test Mode A Troubleshooting - B-CAN System Diagnosis Test Mode A.
Before troubleshooting, check the No. 3 (10 A) and No. 5 (10 A) fuses in the under-hood fuse/relay box, and headlight bulbs.
1. Clear the DTCs with the HDS.
2. Turn the ignition switch to LOCK (0), and then back to ON (II).
3. Operate the parking brake pedal.
4. Check for DTCs with the HDS.
Is DTC B1078 indicated?
YES -
Go to step 5.
NO -
Intermittent failure. The daytime running lights system is OK at this time. Check for loose or poor connections.�
5. Turn the headlight (high beam) ON.
Do both headlights come on?
YES -
Go to step 6.
NO -
Go to step 10.
6. Turn the headlight switch ON.
7. Select the TEST MODE menu from the HDS, then enter the DATA LIST.
8. Check the ON/OFF information of the DAYLIGHT RELAY in the DATA LIST.
Is the information indicator ON?
YES -
Replace the daytime running lights relay.�
NO -
Go to relay control module input test Relay Control Module Input Test.�
9. Check for continuity between headlight (high beam) 2P connectors terminal No. 2 and under-hood fuse/relay box connector H (18P) terminals No. 7 (right headlight) or No. 8 (left headlight) respectively.
Is there continuity?
YES -
Go to step 10.
NO -
Repair an open in the wire.�
10. Check for continuity between left headlight (high beam) 2P connector terminal No. 1 and body ground.
Is there continuity?
YES -
Go to step 11.
NO -
Repair an open in the wire or poor ground (G301) or an open in the ground wire.�
11. Check for continuity between right headlight (high beam) 2P connector terminal No. 1 and daytime running lights relay 5P connector terminal No. 1.
Is there continuity?
YES -
Test the daytime running lights relay Power Relay Test. If OK, faulty relay control module; replace the under-hood fuse/relay box.�
NO -
Repair an open in the wire.�