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. Turn the turn signal switch to the left position and the right position.
4. Check the DTCs with the HDS.

Is DTC B1280 indicated?

YES - Go to step 5.

NO - Intermittent failure. The turn signal/hazard flasher system is OK at this time. Check for loose or poor connections.

5. Select LIGHTING from the BODY ELECTRICAL menu, and enter the DATA LIST.
6. Check the ON/OFF information of the TURN SIGNAL SWITCH (LEFT) and TURN SIGNAL SWITCH (RIGHT).

Are the TURN SIGNAL SWITCH (LEFT) information indicator ON, TURN SIGNAL SWITCH (RIGHT) information indicator OFF with the turn signal switch to the LEFT position, and are the TURN SIGNAL SWITCH (LEFT) information indicator OFF, TURN SIGNAL SWITCH (RIGHT) information indicator ON with the turn signal switch to the RIGHT position?

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

NO - Go to step 7.

7. Disconnect the 12P connector from the combination light switch.
8. Check the ON/OFF information of the TURN SIGNAL SWITCH (LEFT) and TURN SIGNAL SWITCH (RIGHT) in the DATA LIST.

All the information indicators OFF?

YES - Go to step 12.

NO - Go to step 9.

9. Turn the ignition switch OFF.
10. Disconnect the under-dash fuse/relay box connector S (20P).




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

Is there continuity?

YES - Check for continuity between terminal No. 5 and terminals No. 18, and 19 individually. If there is still continuity, repair short to ground, or to another wire.

NO - Faulty MICU; replace the under-dash fuse/relay box.

12. Turn the ignition switch OFF.
13. Check the combination light switch.

Is the combination light switch OK?

YES - Go to step 14.

NO - Faulty combination light switch; replace it.

14. Disconnect the under-dash fuse/relay box connectors S (20P).




15. Check for continuity between the under-dash fuse/relay box connector S (20P) No. 5, No. 18, and No. 19 terminals and the combination light switch 12P connector No. 12, No. 1, and No. 2 terminals.

Is there continuity?

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

NO - Repair an open in the wire.