B1280

DTC B1280: Turn Signal Switch Circuit Malfunction

NOTE: If you are troubleshooting multiple DTCs, be sure to follow the instructions in B-CAN System Diagnosis Test Mode A.

1. Clear the DTCs with the HDS.
2. Turn the ignition switch OFF, and then back ON (II).
3. Operate the turn signal switch in left and right positions.
4. Check for DTCs with the HDS.

Is DTC B1280 indicated?

YES - Go to step 5.

NO - Intermittent failure, the system is OK at this time. Check for loose or poor connections.

5. Select LIGHTING from the BODY ELECTRICAL system select menu, then enter the DATA LIST.




6. Check each turn signal switch position value with the DATA LIST menu.

Are all data list values correct?

YES - Faulty MICU; replace the under-dash fuse/relay box.

NO - Go to step 7.

7. Turn the ignition switch OFF.
8. Disconnect the combination light switch 12P connector.
9. Disconnect the under-dash fuse/relay box connector S (20P).




10. Check for continuity between the body ground and the under-dash fuse/relay box connector S (20P) No. 18, and No. 19 terminals.

Is there continuity?

YES - Repair a short to ground in the wire.

NO - Go to step 11.




11. Check for continuity between the under-dash fuse/relay box connector S (20P) No.18 and No. 19 terminals.

Is there continuity?

YES - Repair a short between the wires.

NO - Replace the combination light switch.