DTC Troubleshooting: 54-03, 54-04, 54-21

DTC 54-03:  Fail-safe Relay 1 Stuck ON
  
  
DTC 54-21:  Fail-safe Relay 1 Stuck OFF (Main)

1.Turn the ignition switch ON (II).

2.Clear the DTC with the HDS.

3.Turn the ignition switch OFF, then turn it ON (II) again.

4.Check for DTCs with the HDS.

Is DTC 54-03, 54-04, or 54-21 indicated?


YES - Check for loose terminals in the VSA modulator-control unit 37P connector. If necessary, substitute a known-good VSA modulator-control unit and retest.n


NO - Intermittent failure, the system is OK at this time. Check for loose terminals at the VSA modulator-control unit 37P connector. Refer to intermittent failures troubleshooting.n