B1078
DTC B1078: Daytime Running Lights Signal ErrorNOTE: If you are troubleshooting multiple DTCs, be sure to follow the instructions in 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 OFF, and then back 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. Disconnect the 6P connector from the electrical compass unit.
7. Turn the headlight switch ON.
8. Select the TEST MODE menu from the HDS, then enter the DATA LIST.
9. 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
10. Check for continuity between the No. 2 terminal of the headlight (high beam) 2P connectors and the No. 7 (right headlight) or No. 8 (left headlight) terminals of the under-hood fuse/relay box connector H (18P).
Is there continuity?
YES - Go to step 11.
NO - Repair an open in the wire.
11. Check for continuity between the No. 1 terminal of the left headlight (high beam) 2P connector and body ground.
Is there continuity?
YES - Go to step 12.
NO - Repair an open in the wire or poor ground (G301).
12. Check for continuity between the No. 1 terminal of the right headlight (high beam) 2P connector and daytime running lights relay 5P connector No. 1 terminal.
Is there continuity?
YES - Test the daytime running lights relay. If OK, faulty relay control module; replace the under-hood fuse/relay box.
NO - Repair an open in the wire.