DTC 54-04

DTC 54-03: Fail-safe Relay 1 Stuck ON
DTC 54-04: Fail-safe Relay 1 Stuck OFF 1
DTC 54-21: Fail-safe Relay 1 Stuck OFF 2
1. Turn the ignition switch ON (II).
2. Clear the DTC with the HDS. Turn the ignition switch OFF, then ON (II) again.
3. 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. If DTCs are not indicated, replace the VSA modulator-control unit.
NO - Intermittent failure, system is OK at this time. Check for poor connections or loose terminals at the VSA modulator-control unit. Refer to intermittent failure.