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Home >> Acura >> 2011 >> TL Base >> Repair and Diagnosis >> Brakes >> Traction Control >> VSA (Vehicle Stability Assist) System Components >> DTC Troubleshooting >> DTC 54: Fail-safe Relay

DTC 54: Fail-safe Relay

  1. Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode.
  2. Clear the DTC with the HDS.
  3. Test-drive the vehicle at 19 mph (30 km/h) or more.
    NOTE: Drive the vehicle on the road, not on a lift.
  4. Check for DTCs with the HDS.

    Is DTC 54 indicated? 

    YES  -Go to step 5.

    NO  -Intermittent failure, the system is OK at this time.

  5. Turn the ignition switch to LOCK (0), or press the engine start/stop button to select the OFF mode.
  6. Check the No. 2-3 (30 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 47P connector (see step  5 ).
  8. Check for continuity between VSA modulator-control unit 47P connector terminal No. 32 and body ground.
    Fig 1: Checking Continuity Between VSA Modulator-Control Unit 47P Connector Terminal No. 32 And Body Ground
    G06680208Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there continuity? 

    YES  -Repair a short to body ground in the wire between the No. 2-3 (30 A) fuse in the under-hood fuse/relay box and the VSA modulator-control unit.

    NO  -Install a new No. 2-3 (30 A) fuse in the under-hood fuse/relay box, then go to step 9.

  9. Reconnect the VSA modulator-control unit 47P connector.
  10. Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode.
  11. Clear the DTC with the HDS.
  12. Test-drive the vehicle at 19 mph (30 km/h) or more.
    NOTE: Drive the vehicle on the road, not on a lift.
  13. Check for DTCs with the HDS.

    Is DTC 54 indicated? 

    YES  -Replace the VSA modulator-control unit (see VSA MODULATOR-CONTROL UNIT REMOVAL AND INSTALLATION  ).

    NO  -Troubleshooting is complete.

  14. Disconnect the VSA modulator-control unit 47P connector (see step  5 on ).
  15. Measure the voltage between VSA modulator-control unit 47P connector terminal No. 32 and body ground.
    Fig 2: Measuring Voltage Between VSA Modulator-Control Unit 47P Connector Terminal No. 32 And Body Ground
    G06680209Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there battery voltage? 

    YES  -Go to step 16.

    NO  -Repair an open in the wire between the No. 2-3 (30 A) fuse in the under-hood fuse/relay box and the VSA modulator-control unit.

  16. Reconnect the VSA modulator-control unit 47P connector.
  17. Update the VSA modulator-control unit if it does not have the latest software (see VSA MODULATOR-CONTROL UNIT UPDATE  ). If the unit already has the latest software, substitute a known-good VSA modulator-control unit (see VSA MODULATOR-CONTROL UNIT REMOVAL AND INSTALLATION  ).
  18. Test-drive the vehicle at 19 mph (30 km/h) or more.
    NOTE: Drive the vehicle on the road, not on a lift.
  19. Check for DTCs with the HDS.

    Is DTC 54 indicated? 

    YES  -Check for loose terminals in the VSA modulator-control unit 47P connector. If the VSA modulator-control unit was updated, substitute a known-good VSA modulator-control unit (see VSA MODULATOR-CONTROL UNIT REMOVAL AND INSTALLATION  ), 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 (see VSA MODULATOR-CONTROL UNIT REMOVAL AND INSTALLATION  ). If any other DTCs are indicated, go to the INDICATED DTCS TROUBLESHOOTING .

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