54-12

VSA DTC Troubleshooting: 54-11, 54-12

DTC 54-11:

Fail-Safe Relay Stuck ON

DTC 54-12:

Fail-Safe Relay Stuck OFF

NOTE: Before you troubleshoot, record all freeze data and any on-board snapshot, and review the general troubleshooting information Reading and Clearing Diagnostic Trouble Codes.

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

2. Clear the DTC with the HDS.

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

4. Check for DTCs with the HDS.

Is DTC 54-11 or 54-12 indicated?

YES -

Go to step 5.

NO -

Intermittent failure, the system is OK at this time.�

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

6. Check the No. 18 (40 A) fuse in the under-hood fuse/relay box.

Is the fuse blown?

YES -

Go to step 7.

NO -

Reinstall the checked fuse, then go to step 14.

7. Disconnect the VSA modulator-control unit 36P connector Service and Repair.

8. Check for continuity between VSA modulator-control unit 36P connector terminal No. 12 and body ground.





Is there continuity?

YES -

Repair a short to body ground in the wire between the No. 18 (40 A) fuse in the under-hood fuse/relay box and the VSA modulator-control unit.�

NO -

Install a new No. 18 (40 A) fuse in the under-hood fuse/relay box, then go to step 9.

9. Reconnect the VSA modulator-control unit 36P connector.

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

11. Clear the DTC with the HDS.

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

13. Check for DTCs with the HDS.

Is DTC 54-11 or 54-12 indicated?

YES -

Replace the VSA modulator-control unit Service and Repair.�

NO -

The troubleshooting is complete.�

14. Measure the voltage between VSA modulator-control unit 36P connector terminal No. 12 and body ground.





Is there battery voltage?

YES -

Go to step 15.

NO -

Repair an open in the wire between the No. 18 (40 A) fuse in the under-hood fuse/relay box and the VSA modulator-control unit.�

15. Update the VSA modulator-control unit if it does not have the latest software Testing and Inspection. If the unit already has the latest software, substitute a known-good VSA modulator-control unit Service and Repair.

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

17. Check for DTCs with the HDS.

Is DTC 54-11 or 54-12 indicated?

YES -

Check for loose terminals in the VSA modulator-control unit 36P connector. If the VSA modulator-control unit was updated, substitute a known-good VSA modulator-control unit Service and Repair, then retest. If the VSA modulator-control unit was substituted, go to step 1.

NO -

If the VSA modulator-control unit was updated, troubleshooting is complete. If the VSA modulator-control unit was substituted, replace the original VSA modulator-control unit Service and Repair. If any other DTCs are indicated, go to the indicated DTCs troubleshooting.�