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DTC B1390: Power Tailgate Closer Motor Function Error

WARNING: This page is about a different car, the 2011 Honda Pilot, 2010 Honda Pilot, and 2009 Honda Pilot. However, it is still accessible from the selected car via links, so may be relevant.
NOTE: If you are troubleshooting multiple DTCs, be to follow the instructions in B-CAN System Diagnosis Test Mode A (see TROUBLESHOOTING - B-CAN SYSTEM DIAGNOSIS TEST MODE A ).
  1. With the tailgate closed, pull the tailgate outer handle and wait for 10 seconds.
  2. Turn the ignition switch to LOCK (0), and then back to ON (II).
  3. Clear the DTCs with the HDS.
  4. Listen for the sound of the latch releasing.

    Is there sound? 

    YES  - Go to step  5.

    NO  - Go to Step  7.

  5. Check for DTCs with the HDS.

    Is DTC B1390 indicated? 

    YES  - Go to step  6.

    NO  - Intermittent failure, the system is OK at this time. Check for loose or poor connections between the power tailgate control unit and the closer motor. ■

  6. Check for DTCs with the HDS.

    Are DTCs B1380, B1381, B1382, B1383 and/or B1384 also indicated? 

    YES  - Troubleshoot the indicated DTCs. ■

    NO  - Replace the power tailgate control unit (see CONTROL UNIT INPUT TEST/REPLACEMENT  ), and recheck the system. ■

  7. Turn the ignition switch to LOCK (0).
  8. Open the tailgate.
  9. Disconnect the 2P connector from the power tailgate closer motor.
  10. Disconnect power tailgate control unit connector B (20P).
  11. Check for continuity between power tailgate control unit connector B (20P) terminals No. 9 and No. 20 and the power tailgate closer motor 2P connector terminals No. 2 and No. 1 respectively.

    12. Is there continuity? 

    YES  - Go to step  12.

    NO  - Repair an open or high resistance in the wire. ■

    Fig 1: Checking Continuity Between Power Tailgate Control Unit Connector B (20P) Terminals No. 9 & No. 20
    G05966769Courtesy of AMERICAN HONDA MOTOR CO., INC.
  12. Measure voltage between power tailgate control unit connector B (20P) terminal No. 12 and body ground.

    Is there battery voltage? 

    YES  - Go to step  14.

    NO  - Check for No. 8 (20 A) fuse in the auxiliary under-hood fuse/relay box. If the fuse is OK, check for an open or high resistance in the wire between the auxiliary under-hood fuse/relay box and power tailgate control unit. ■

    Fig 2: Measuring Voltage Between Power Tailgate Control Unit Connector B (20P) Terminal 12 & Body Ground
    G05966770Courtesy of AMERICAN HONDA MOTOR CO., INC.
  13. Disconnect power tailgate control unit connector A (5P).
  14. Check for continuity between power tailgate control unit connector A (5P) terminal No. 4 and body ground.

    Is there continuity? 

    YES  - Go to step  15.

    NO  - Repair an open or high resistance in the wire or poor ground (G701). ■

    Fig 3: Checking Continuity Between Power Tailgate Control Unit Connector A (5P) Terminal 4 & Body Ground
    G05966771Courtesy of AMERICAN HONDA MOTOR CO., INC.
  15. Turn the tailgate lock latch to the fully-closed position using a screwdriver.
  16. Reconnect the power tailgate closer motor 2P connector.
  17. Connect battery power to power tailgate control unit connector B (20P) terminal No. 20 (or No. 9) and ground terminal No. 9 (or No. 20) momentarily.
    Fig 4: Checking Connect Battery Power To Power Tailgate Control Unit Connector B (20P) Terminal 20 (Or 9) & Ground Terminal
    G05966772Courtesy of AMERICAN HONDA MOTOR CO., INC.

    18. Does the motor run smoothly? 

    YES  - Replace the power tailgate control unit (see CONTROL UNIT INPUT TEST/REPLACEMENT  ). ■

    NO  - Go to step  18.

  18. Reconnect the 6P connector to the power tailgate closer unit.
  19. Check for continuity between power tailgate control unit connector B (20P) terminals No. 2 and No. 20 and body ground individually.

    Is there continuity? 

    YES  - Go to step  20.

    NO  - Go to step  22.

    Fig 5: Checking Continuity Between Power Tailgate Control Unit Connector B (20P) Terminals 2, 20 & Body Ground
    G05966773Courtesy of AMERICAN HONDA MOTOR CO., INC.
  20. Disconnect the 6P connector from the power tailgate closer unit.
  21. Check for continuity between power tailgate control unit connector B (20P) terminals No. 9 and No. 20 and body ground individually.

    Is there continuity? 

    YES  - Repair a short to ground in the wire. ■

    NO  - Replace the power tailgate latch assembly (see TAILGATE LATCH REPLACEMENT ). ■

    Fig 6: Checking Continuity Between Power Tailgate Control Unit Connector B (20P) Terminals 9, 20 & Body Ground
    G05966774Courtesy of AMERICAN HONDA MOTOR CO., INC.
  22. Check for continuity between power tailgate control unit connector B (20P) terminal No. 2 and body ground.

    Is there continuity? 

    YES  - Repair short to ground in the wire. ■

    NO  - Check for No. 8 (20 A) fuse in the auxiliary under-hood fuse/relay box. If the fuse is OK, check for an open or high resistance in the wire between the auxiliary under-hood fuse/relay box and power tailgate control unit. ■

    Fig 7: Checking Continuity Between Power Tailgate Control Unit Connector B (20P) Terminal 2 & Body Ground
    G05966775Courtesy of AMERICAN HONDA MOTOR CO., INC.
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