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DLC Circuit Troubleshooting

NOTE: Make sure the HDS and its DLC cable are working properly.
  1. Turn the ignition switch to LOCK (0).
  2. Connect the HDS to the DLC (see GENERAL TROUBLESHOOTING INFORMATION  ).
  3. Turn the ignition switch to ON (II), and read the HDS.

    Does the HDS identify the vehicle? 

    YES  -Go to step  4.

    NO  -Do the DLC circuit troubleshooting (see DLC CIRCUIT TROUBLESHOOTING ).

  4. Check the No. B42 + B IMA 1 (7.5 A) fuse in the under-dash fuse/relay box.

    Is the fuse OK? 

    YES  -Go to step  5.

    NO  -Repair a short in the wire between the No. B42 + B IMA 1 (7.5 A) fuse and the MCM (A9). Also replace the No. B42 + B IMA 1 (7.5 A) fuse.

  5. Turn the ignition switch to LOCK (0).
  6. Turn the battery module switch OFF (see TURNING OFF AND ON POWER TO THE HIGH VOLTAGE CIRCUIT  ).
  7. Remove the IPU cover (see IPU COVER REMOVAL/INSTALLATION  ).
  8. Turn the battery module switch ON (see TURNING OFF AND ON POWER TO THE HIGH VOLTAGE CIRCUIT  ).
  9. Turn the ignition switch to ON (II), and listen for a clicking sound from MCM relay 1 (A).
    Fig 1: Identifying MCM Relay 1 Components Location
    G06950505Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there a clicking sound? 

    YES  -Go to step  10.

    NO  -Go to step  25.

  10. Turn the ignition switch to LOCK (0).
  11. Remove MCM relay 1 (A).
    Fig 2: Identifying MCM Relay 1 Components Location
    G06950506Courtesy of AMERICAN HONDA MOTOR CO., INC.
  12. Test MCM relay 1 (see POWER RELAY TEST ).

    Is the relay OK? 

    YES  -Go to step  13.

    NO  -Replace MCM relay 1.

  13. Turn the ignition switch to ON (II).
  14. Measure the voltage between IPU relay holder (MCM relay 1) 8P connector terminal No. 6 and body ground.
    Fig 3: Measuring Voltage Between IPU Relay Holder (Mcm Relay 1) 8P Connector Terminal No. 6 And Body Ground
    G06950507Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there battery voltage? 

    YES  -Go to step  15.

    NO  -Repair an open in the wire between the No. No.B42 + B IMA 1 (7.5 A) fuse and MCM relay 1.

  15. Turn the ignition switch to LOCK (0).
  16. Reinstall MCM relay 1 (A).
    Fig 4: Identifying MCM Relay 1 Components Location
    G06950508Courtesy of AMERICAN HONDA MOTOR CO., INC.
  17. Remove the PCU lid, the PCU busplate, and the PCU cover (see IPU CASE REMOVAL/INSTALLATION  ).
  18. Turn the ignition switch to ON (II).
  19. Measure the voltage between MCM connector terminals A6 and A9.
    Fig 5: Measuring Voltage Between MCM Connector Terminals A6 And A9
    G06950509Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there battery voltage? 

    YES  -Go to step  20.

    NO  -Go to step  24.

  20. Turn the ignition switch to LOCK (0).
  21. Disconnect MCM connector A (31P).
  22. Check for continuity between MCM connector terminal A23 and DLC terminal No. 6.
    Fig 6: Checking Continuity Between MCM Connector Terminal A23 And DLC Terminal No. 6
    G06950510Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there continuity? 

    YES  -Go to step  23.

    NO  -Repair an open in the wire between DLC terminal No. 6 and the MCM (A23).

  23. Check for continuity between MCM connector terminal A22 and DLC terminal No. 14.
    Fig 7: Checking Continuity Between MCM Connector Terminal A22 And DLC Terminal No. 14
    G06950511Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there continuity? 

    YES  -Update the MCM if it does not have the latest software (see MOTOR CONTROL MODULE (MCM) UPDATE  ), or substitute a known-good MCM (see SUBSTITUTING THE MCM  ), then recheck. If the symptom goes away with a known-good MCM, replace the original MCM (see IPU CASE REMOVAL/INSTALLATION  ).

    NO  -Repair an open in the wire between DLC terminal No. 14 and the MCM (A22).

  24. Measure the voltage between MCM connector terminal No. 9 and body ground.
    Fig 8: Measuring Voltage Between MCM Connector Terminal No. 9 And Body Ground
    G06950512Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there battery voltage? 

    YES  -Repair an open in the wire between the MCM (A6) and G901 (see IMA MOTOR POWER CABLE (CARGO AREA BRANCH) (IA) ).

    NO  -Repair an open in the wire between the MCM (A9) and MCM relay 1.

  25. Turn the ignition switch to LOCK (0).
  26. Remove MCM relay 1 (A).
    Fig 9: Identifying MCM Relay 1 Components Location
    G06950513Courtesy of AMERICAN HONDA MOTOR CO., INC.
  27. Test MCM relay 1 (see POWER RELAY TEST ).

    Is the relay OK? 

    YES  -Go to step  28.

    NO  -Replace MCM relay 1.

  28. Turn the ignition switch to ON (II).
  29. Measure the voltage between IPU relay holder (MCM relay 1) 8P connector terminal No. 7 and body ground.
    Fig 10: Measuring Voltage Between IPU Relay Holder (MCM Relay 1) 8P Connector Terminal No. 7 And Body Ground
    G06950514Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there battery voltage? 

    YES  -Go to step  30.

    NO  -Repair an open in the wire between the No. B42 + B IMA 1 (7.5 A) fuse and MCM relay 1.

  30. Turn the ignition switch to LOCK (0).
  31. Reinstall MCM relay 1 (A).
    Fig 11: Identifying MCM Relay 1 Components Location
    G06950515Courtesy of AMERICAN HONDA MOTOR CO., INC.
  32. Remove the PCU lid, the PCU busplate, and the PCU cover (see IPU CASE REMOVAL/INSTALLATION  ).
  33. Turn the ignition switch to ON (II).
  34. Measure the voltage between MCM connector terminal A3 and body ground.
    Fig 12: Measuring Voltage Between MCM Connector Terminal A3 And Body Ground
    G06950516Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there battery voltage? 

    YES  -Go to step  35.

    NO  -Repair an open in the wire between MCM relay 1 and the MCM (A3).

  35. Turn the ignition switch to LOCK (0).
  36. Disconnect MCM connector A (31P).
  37. Check for continuity between MCM connector terminal A6 and body ground.
    Fig 13: Checking Continuity Between MCM Connector Terminal A6 And Body Ground
    G06950517Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there continuity? 

    YES  -Go to step  38.

    NO  -Repair an open in the wire between the MCM (A6) and G901 (see IMA MOTOR POWER CABLE (CARGO AREA BRANCH) (IA) ).

  38. Turn the ignition switch to ON (II).
  39. Measure the voltage between MCM connector terminal A7 and body ground.
    Fig 14: Measuring Voltage Between MCM Connector Terminal A7 And Body Ground
    G06950518Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there battery voltage? 

    YES  -Go to step  40.

    NO  -Repair an open in the wire between the No. B22 METER (7.5 A) fuse and the MCM(A7).

  40. Measure the voltage between MCM connector terminal A8 and body ground.
    Fig 15: Measuring Voltage Between MCM Connector Terminal A8 And Body Ground
    G06950519Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there battery voltage? 

    YES  -Replace the original MCM (see IPU CASE REMOVAL/INSTALLATION  ).

    NO  -Repair an open in the wire between the No. B1 + B BACK UP (15 A) fuse and the MCM (A8).

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