B1280

DTC Troubleshooting: B1280

DTC B1280:

Turn Switch Circuit Malfunction

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.

1. Clear the DTCs with the HDS.

2. Turn the ignition switch to LOCK (0) and then back to ON (II).

3. Check for DTCs with the HDS.

Is DTC B1280 indicated?

YES -

Go to step 4.

NO -

Intermittent failure, the system is OK at this time. Check for loose or poor connections.�

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

5. Check each combination light switch position value with the DATA LIST menu.

When the turn signal switch is in left position:





When the turn signal switch is in right position:





Are all data list values correct?

YES -

Faulty MICU; replace the under-dash fuse/relay box Under-Dash Fuse/Relay Box Removal And Installation.�

NO -

Go to step 6.

6. Turn the ignition switch to LOCK (0).

7. Disconnect the combination light switch 12P connector.

8. Turn the ignition switch to ON (II).

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

10. Check each combination light switch position value with the DATA LIST menu.

When the turn signal switch is in right position:





Are both data list values indicated OFF

YES -

Go to step 14.

NO -

Go to step 11.

11. Turn the ignition switch to LOCK (0).

12. Disconnect under-dash fuse/relay box connector S (20P).

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





Is there continuity?

YES -

Repair a short to ground in the wire.�

NO -

Faulty MICU; replace the under-dash fuse/relay box Under-Dash Fuse/Relay Box Removal And Installation.�

14. Turn the ignition switch to LOCK (0).

15. Do the combination light switch test Service and Repair.

Is the combination light switch OK?

YES -

Go to step 16.

NO -

Replace the combination light switch Service and Repair.�

16. Disconnect under-dash fuse/relay box connector S (20P).

17. Check for continuity between under-dash fuse/relay box connector S (20P) terminals and the combination light switch 12P connector terminals as shown:









Is there continuity?

YES -

Faulty MICU; replace the under-dash fuse/relay box Under-Dash Fuse/Relay Box Removal And Installation.�

NO -

Repair an open or high resistance in the wire.�