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Home >> Honda >> 2013 >> CR-Z Base, Automatic CVT Trans >> Repair and Diagnosis >> Accessories & Equipment >> Communication Devices >> Communication Systems (F-Can, IMA-Can, K-Line) >> DLC Circuit Troubleshooting

DLC Circuit Troubleshooting

NOTE: If you suspect the HDS or the HDS DLC cable may be the source of the communication problem, verify that they are working properly by connecting them to a known-good, like vehicle and system, and checking for communication problems.
  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  5.

    NO  -Go to step  4.

  4. Try to start the engine.

    Does the engine start and idle smoothly? 

    YES  -Go to step  24.

    NO  -Go to the ECM/PCM power and ground circuit troubleshooting (see ECM/PCM POWER AND GROUND CIRCUIT TROUBLESHOOTING ).

  5. Check for Pending or Confirmed DTCs in the PGM-FI system with the HDS.

    Are any Pending or Confirmed DTCs indicated? 

    YES  -Go to the INDICATED DTC'S TROUBLESHOOTING .

    NO  -

    • If the HDS does not communicate with the SRS, go to step  6.
    • If the HDS does not communicate with the VSA system, go to step  8.
    • If the HDS does not communicate with the EPS system, go to step  10.
    • If the HDS does not communicate with the TPMS, go to step  12.
    • If the HDS does not communicate with the IMMOBI (immobilizer) system, go to step  14.
    • If the HDS does not communicate with the BODY ELECTRICAL system, go to step  16.
  6. Turn the ignition switch to LOCK (0).
  7. Turn the ignition switch to ON (II), and watch the SRS indicator.

    Does the SRS indicator come on and go off? 

    YES  -Go to step  18.

    NO  -Go to the SRS general troubleshooting information (see GENERAL TROUBLESHOOTING INFORMATION ).

  8. Turn the ignition switch to LOCK (0).
  9. Turn the ignition switch to ON (II), and watch the VSA indicator.

    Does the VSA indicator come on and go off? 

    YES  -Go to step  18.

    NO  -Go to the VSA symptom troubleshooting for ABS indicator, brake system indicator, and VSA indicator do not go off (see SYMPTOM TROUBLESHOOTING ).

  10. Turn the ignition switch to LOCK (0).
  11. Start the engine, and watch the EPS indicator.

    Does the EPS indicator come on and go off? 

    YES  -Go to step  18.

    NO  -Go to the EPS symptom troubleshooting for EPS indicator does not go off, and no DTCs are stored (see SYMPTOM TROUBLESHOOTING ).

  12. Turn the ignition switch to LOCK (0).
  13. Start the engine, and watch the TPMS indicator.

    Does the TPMS indicator come on and go off? 

    YES  -Go to step  18.

    NO  -Go to the TPMS symptom troubleshooting for TPMS indicator does not go off, and no DTCs are stored (see DTC 91, 93, 95, 97: TIRE PRESSURE SENSOR INTERNAL ERROR ).

  14. Turn the ignition switch to LOCK (0).
  15. Turn the ignition switch to ON (II), and watch the immobilizer indicator.

    Does the immobilizer indicator stay on or flash? 

    YES  -Go to the immobilizer system's troubleshooting (see SYMPTOM TROUBLESHOOTING INFORMATION ).

    NO  -Go to step  18.

  16. Do the gauge self-diagnostic function (see SELF-DIAGNOSTIC FUNCTION ).
  17. Check the gauge display.

    Is Error 2 indicated? 

    YES  -Check for B-CAN system DTCs.

    NO  -Go to step  18.

  18. Turn the ignition switch to LOCK (0), then do the 12 volt battery terminal disconnection procedure (see 12 VOLT BATTERY TERMINAL DISCONNECTION AND RECONNECTION ), and wait at least 3 minutes before continuing.
  19. Disconnect the HDS from the DLC.
  20. Check for continuity between DLC terminal No. 7 and body ground.
    Fig 1: Checking Continuity Between DLC Terminal No. 7 And Body Ground
    G06950215Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there continuity? 

    YES  -Go to step  21.

    NO  -Go to step  22.

  21. Continue to check for continuity between DLC terminal No. 7 and body ground, while disconnecting these connectors, one at a time:
    • SRS unit connector A (39P)
    • VSA modulator-control unit 32P connector
    • EPS control unit connector A (11P)
    • TPMS control unit 20P connector
    • Immobilizer-keyless control unit 7P connector
    • Audio-navigation unit connector A (24P) (with navigation)
    • Audio unit connector A (24P) (without navigation)
    • Under-dash fuse/relay box connector Y (16P)

    Does continuity go away when one of the above connectors is disconnected? 

    YES  -Replace the part that caused continuity go away when it was disconnected.

    NO  -Repair a short in the wire between the DLC (K-line) and the VSA modulator-control unit, the SRS unit, the EPS control unit, the TPMS control unit, the immobilizer-keyless control unit, the audio-navigation unit (with navigation), the audio unit (without navigation), or the under-dash fuse/relay box.

  22. Connect DLC terminal No. 7 to body ground with a jumper wire.
    Fig 2: Connecting DLC Terminal No. 7 To Body Ground With Jumper Wire
    G06950216Courtesy of AMERICAN HONDA MOTOR CO., INC.
  23. Check for continuity between body ground and these connector terminals:
    CONNECTOR TERMINAL REFERENCE CHART

    Connector Terminal
    SRS unit A (39P) No. 5 (BLU)
    VSA modulator-control unit 32P No. 8 (BLU)
    EPS control unit A (11P) No. 5 (BLU)
    TPMS control unit 20P No. 4 (BLU)
    Immobilizer-keyless control unit 7P No. 3 (BLU)
    Audio-navigation unit A (24P) (with navigation) No. 13 (BLU)
    Audio unit A (24P) (without navigation) No. 13 (BLU)
    Under-dash fuse/relay box Y (16P) No. 7 (BLU)

    Is there continuity between body ground and each of the terminals in the chart? 

    YES  -Replace the part that does not communicate with the HDS.

    NO  -Repair an open in the wire between the DLC (K-line) and the appropriate connector.

  24. Check for B-CAN system DTCs without the HDS (see GENERAL TROUBLESHOOTING INFORMATION ).

    Is DTC U0029 and/or U0100 indicated? 

    YES  -Go to the F-CAN CIRCUIT TROUBLESHOOTING  .

    NO  -Go to step  25.

  25. Turn the ignition switch to LOCK (0).
  26. Disconnect the HDS from the DLC.
  27. Measure the voltage between DLC terminal No. 16 and body ground.
    Fig 3: Measuring Voltage Between DLC Terminal No. 16 And Body Ground
    G06950217Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there battery voltage? 

    YES  -Go to step  28.

    NO  -Repair an open in the wire between DLC terminal No. 16 and the No. B1 BACK UP (15 A) fuse in the under-dash fuse/relay box.

  28. Measure the voltage between DLC terminals No. 4 and No. 16.
    Fig 4: Measuring Voltage Between DLC Terminals No. 4 And 16
    G06950218Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there battery voltage? 

    YES  -Go to step  29.

    NO  -Repair an open in the wire between DLC terminal No. 4 and body ground (G502 (see DASHBOARD WIRE HARNESS (VIEW OF MIDDLE SECTION) (BD) )).

  29. Connect the HDS to the DLC (see GENERAL TROUBLESHOOTING INFORMATION ).
  30. Jump the SCS line with the HDS.
  31. Disconnect ECM/PCM connector A (44P).
  32. Disconnect the HDS from the DLC.
  33. Check for continuity between ECM/PCM connector terminal A36 and DLC terminal No. 6.
    Fig 5: Checking Continuity Between ECM/PCM Connector Terminal A36 And DLC Terminal No. 6
    G06950219Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there continuity? 

    YES  -Go to step  34.

    NO  -Repair an open in the wire between the ECM/PCM (A36) and DLC terminal No. 6.

  34. Check for continuity between ECM/PCM connector terminal A37 and DLC terminal No. 14.
    Fig 6: Checking Continuity Between ECM/PCM Connector Terminal A37 And DLC Terminal No. 14
    G06950220Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there continuity? 

    YES  -Update the ECM/PCM if it does not have the latest software (see ELD REPLACEMENT ), or substitute a known-good ECM/PCM (see SUBSTITUTING THE ECM/PCM ), then recheck. If the symptom/indication goes away and the ECM/PCM was updated, troubleshooting is complete. If the symptom/indication goes away and the ECM/PCM was substituted, replace the original ECM/PCM (see ECM/PCM REPLACEMENT ).

    NO  -Repair an open in the wire between the ECM/PCM (A37) and DLC terminal No. 14.

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