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DLC Circuit Troubleshooting

WARNING: This page is about a different variant/trim than selected.

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, similar vehicle and system, and check for communication problems.

*1: With navigation
*2: Without navigation
  1. HDS communication check

    -1. Turn the vehicle to the OFF (LOCK) mode.

    -2. Connect the HDS to the DLC .

    NOTE:  Make sure the HDS is properly connected to the DLC.

    -3. Turn the vehicle to the ON mode, and turn on the HDS.

    Does the HDS identify the vehicle?

    YES 

    Go to step 2.

    NO 

    Go to step 14.

  2. Determine possible failure area (PGM-FI system, other systems)

    -1. Check for Pending or Confirmed DTCs in the PGM-FI system with the HDS.

    DTC Description Confirmed DTC Pending DTC
         

    Are any Pending or Confirmed DTCs indicated?

    YES 

    Go to the indicated DTC's troubleshooting.

    NO 

    If the HDS does not communicate with the PCM, go to step 3.

    NO 

    If the HDS does not communicate with the SRS, go to step 5.

    NO 

    If the HDS does not communicate with the VSA system, go to step 6.

    NO 

    If the HDS does not communicate with the EPS system, go to step 7.

    NO 

    If the HDS does not communicate with the ONE-PUSH START system, go to step 8.

    NO 

    If the HDS does not communicate with the BODY ELECTRICAL system, go to step 9.

    NO 

    If the HDS does not communicate with the DRIVING SUPPORT system, go to step 10.

  3. Open wire check (F-CAN A_H line)

    -1. Turn the vehicle to the OFF (LOCK) mode.

    -2. Jump the SCS line with the HDS, and wait more than 1 minute.

    -3. Disconnect the following connectors.

    CAN gateway 16P connector
    PCM connector A (50P)

    -4. Measure the resistance between test points 1 and 2.

    Test condition Vehicle OFF (LOCK) mode
      CAN gateway 16P connector: disconnected
      PCM connector A (50P): disconnected
    Test point 1 CAN gateway 16P connector (female terminals) No. 3:
    Test point 2 PCM connector A (50P) No. 37
    GHH380116Courtesy of HONDA, U.S.A., INC.

    Is there 1.0 Ω or less?

    YES 

    The F-CAN A_H wire is OK. Go to step 4.

    NO 

    Repair an open in the F-CAN A_H wire between the PCM (A37) and the CAN gateway.

  4. Open wire check (F-CAN A_L line)

    -1. Measure the resistance between test points 1 and 2.

    Test condition Vehicle OFF (LOCK) mode
      CAN gateway 16P connector: disconnected
      PCM connector A (50P): disconnected
    Test point 1 CAN gateway 16P connector (female terminals) No. 11:
    Test point 2 PCM connector A (50P) No. 36
    GHH380118Courtesy of HONDA, U.S.A., INC.

    Is there 1.0 Ω or less?

    YES 

    The F-CAN A_L wire is OK. Check for poor connections or loose terminals at the CAN gateway and the PCM. Go to the PCM power and ground circuit troubleshooting .

    NO 

    Repair an open in the F-CAN A_L wire between the PCM (A36) and the CAN gateway.

  5. SRS check

    -1. Turn the vehicle to the OFF (LOCK) mode.

    -2. Turn the vehicle to the ON mode, and watch the SRS indicator.

    Does the SRS indicator come on and go off?

    YES 

    The SRS is OK. Go to step 11.

    NO 

    Go to the symptom troubleshooting for SRS indicator stays on, but no DTCs are stored, or cannot be read .

  6. VSA system check

    -1. Turn the vehicle to the OFF (LOCK) mode.

    -2. Turn the vehicle to the ON mode, and watch the VSA indicator.

    Does the VSA indicator come on and go off?

    YES 

    The VSA system is OK. Go to step 11.

    NO 

    Go to the symptom troubleshooting for ABS indicator, brake system indicator (red), VSA indicator, and brake system indicator (amber) do not go off .

  7. EPS system check

    -1. Turn the vehicle to the OFF (LOCK) mode.

    -2. Enter the maintenance mode , then start the engine, and watch the EPS indicator.

    Does the EPS indicator come on and go off?

    YES 

    The EPS system is OK. Go to step 11.

    NO 

    Go to the EPS symptom troubleshooting for EPS indicator does not go off, and no DTCs are stored .

  8. Keyless access system check

    -1. Turn the vehicle to the OFF (LOCK) mode.

    -2. Turn the vehicle to the ON mode, and watch the security indicator.

    Does the security indicator stay on or blinkΩ

    YES 

    Go to the keyless access system symptom troubleshooting information .

    NO 

    The keyless access system is OK. Go to step 11.

  9. Body electrical system check

    -1. Do the gauge control module self-diagnostic function .

    -2. Check the gauge display.

    Is Error 2 indicated?

    YES 

    Go to the indicated DTC's troubleshooting.

    NO 

    The body electrical system is OK. Go to step 11.

  10. Driving support system check

    -1. Turn the vehicle to the OFF (LOCK) mode.

    -2. Turn the vehicle to the ON mode, and watch the ACC indicator, the CMBS indicator, the LKAS indicator, the RDM indicator, and the auto high-beam activation indicator.

    Does the ACC indicator, the CMBS indicator, the LKAS indicator, the RDM indicator, and/or the auto high-beam activation indicator come on and go off?

    YES 

    The driving support system is OK. Go to step 11.

    NO 

    Go to the driving support system symptom troubleshooting; ACC , CMBS , LKAS , RDM , Auto High-Beam .

  11. Open wire check (K-LINE line or L-LINE line)

    -1. Turn the vehicle to the OFF (LOCK) mode.

    -2. Disconnect the HDS from the DLC.

    Disconnect the control unit(s) on the K-LINE or L-LINE that does not communicate.

    NOTE:  Before disconnecting the SRS unit connector, do the 12 volt battery terminal disconnection procedure and wait for at least 3 minutes.

    K-LINE 

    • Audio-navigation unit connector A (24P) *1
    • Audio unit connector A (24P) *2
    • ANC/active sound control unit 20P connector
    • Body control module connector D (40P)

    L-LINE 

    • Body control module connector F (36P)
    • SRS unit connector A (39P)

    -4. Measure the resistance between DLC (16P) No. 7 (K-LINE line) and these connector terminals, or DLC (16P) No. 15 (L-LINE line) and these connector terminals:

    K-LINE 

    Connector Terminal
    Audio-navigation unit connector A (24P)*1 No. 12
    Audio unit connector A (24P)*2 No. 12
    ANC/active sound control unit 20P connector No. 14
    Body control module connector D (40P) No. 36

    L-LINE 

    Connector Terminal
    Body control module connector F (36P) No. 21
    SRS unit connector A (39P) No. 33

    Is there 1.0 Ω or less between the DLC and the terminals in the chart?

    YES 

    Go to step 12.

    NO 

    Repair an open in the wire between the DLC (K-LINE wire or L-LINE wire) and the appropriate connector.

  12. Determine possible failure area (short in K-LINE line or L-LINE line, others)

    -1. Reconnect all connectors.

    -2. If the 12 volt battery negative terminal is disconnected in step 11-3, do the 12 volt battery terminal reconnection procedure .

    -3. Turn the vehicle to the ON mode.

    -4. Measure the voltage between test points 1 and 2.

    Test condition Vehicle ON mode
    Test point 1 DLC (16P) (female terminals) No. 7 and No. 15:
    Test point 2 Body ground
    GHH380120Courtesy of HONDA, U.S.A., INC.

    Is there any voltage?

    YES 

    Go to step 14.

    NO 

    Go to step 13.

  13. Shorted wire check (K-LINE line, L-LINE line):

    Continue to measure the voltage between DLC (16P) No. 7 (K-LINE line) and body ground, or DLC (16P) No. 15 (L-LINE line) and body ground while disconnecting these parts, one at a time:

    NOTE:  Turn the vehicle to the OFF (LOCK) mode before disconnecting the connector, and turn the vehicle to the ON mode before measuring the voltage.

    K-LINE 

    • Audio-navigation unit connector A (24P) *1
    • Audio unit connector A (24P) *2
    • ANC/active sound control unit 20P connector
    • Body control module connector D (40P)

    L-LINE 

    Is there battery voltage when the one of the above components is disconnected?

    YES 

    Replace the component that caused the battery voltage to return when it was disconnected.

    NO 

    Repair a short in the wire between the DLC (16P) No. 7 (K-LINE) and the audio-navigation unit *1, audio unit *2, the ANC/active sound control unit, the body control module, or the DLC (16P) No. 15 (L-LINE) and the body control module, the SRS unit.

  14. Body electrical system (B-CAN) check

    -1. Do the gauge control module self-diagnostic function .

    -2. Check for gauge control module DTCs without the HDS.

    Is DTC U0029 and/or U0100 indicated?

    YES 

    Do the PCM power and ground circuit troubleshooting .

    NO 

    Go to step 15.

  15. Open wire check (+B_BACK_UP line)

    -1. Turn the vehicle to the OFF (LOCK) mode.

    -2. Disconnect the HDS from the DLC.

    -3. Measure the voltage between test points 1 and 2.

    Test condition Vehicle OFF (LOCK) mode
    Test point 1 DLC (16P) (female terminals) No. 16:
    Test point 2 Body ground
    GHH380122Courtesy of HONDA, U.S.A., INC.

    Is there battery voltage?

    YES 

    The +B_BACK_UP wire is OK. Go to step 16.

    NO 

    Repair an open in the +B_BACK_UP wire between data link connector (16P) No. 16 and the No. A18 fuse .

  16. Open wire check (GND line)

    -1. Measure the voltage between test points 1 and 2.

    Test condition Vehicle OFF (LOCK) mode
    Test point 1 DLC (16P) (female terminals) No. 4:
    Test point 2 DLC (16P) (female terminals) No. 16:
    GHH380125Courtesy of HONDA, U.S.A., INC.

    Is there battery voltage?

    YES 

    The GND wire is OK. Go to step 17.

    NO 

    Repair an open in the GND wire between DLC (16P) No. 4 and G401.

  17. Open wire check (+B_BACK_UP line)

    -1. Disconnect the following connector.

    CAN gateway 16P connector

    -2. Measure the voltage between test points 1 and 2.

    Test condition Vehicle OFF (LOCK) mode
    Test point 1 CAN gateway 16P connector (female terminals) No. 1:
    Test point 2 Body ground
    GHH380127Courtesy of HONDA, U.S.A., INC.

    Is there battery voltage?

    YES 

    The +B_BACK_UP wire is OK. Go to step 18.

    NO 

    Repair an open in the +B_BACK_UP wire between CAN gateway (16P) No. 1 and the No. A18 fuse .

  18. Open wire check (IG1_METER line)

    -1. Turn the vehicle to the ON mode.

    -2. Measure the voltage between test points 1 and 2.

    Test condition Vehicle ON mode
      CAN gateway 16P connector: disconnected
    Test point 1 CAN gateway 16P connector (female terminals) No. 9:
    Test point 2 Body ground
    GHH380129Courtesy of HONDA, U.S.A., INC.

    Is there battery voltage?

    YES 

    The IG1_METER wire is OK. Go to step 19.

    NO 

    Repair an open in the IG1_METER wire between the CAN gateway and the No. D7 fuse .

  19. Open wire check (GND line)

    -1. Turn the vehicle to the OFF (LOCK) mode.

    -2. Measure the resistance between test points 1 and 2.

    Test condition Vehicle OFF (LOCK) mode
      CAN gateway 16P connector: disconnected
    Test point 1 CAN gateway 16P connector (female terminals) No. 12:
    Test point 2 Body ground
    GHH380131Courtesy of HONDA, U.S.A., INC.

    Is there 1.0 Ω or less?

    YES 

    The GND wire is OK. Go to step 20.

    NO 

    Repair an open in the GND wire between the CAN gateway and G401.

  20. Open wire check (DIAG-CAN_H line)

    -1. Measure the resistance between test points 1 and 2.

    Test condition Vehicle OFF (LOCK) mode
      CAN gateway 16P connector: disconnected
    Test point 1 CAN gateway 16P connector (female terminals) No. 2:
    Test point 2 DLC (16P) (female terminals) No. 6:
    GHH380134Courtesy of HONDA, U.S.A., INC.
    GHH380135Courtesy of HONDA, U.S.A., INC.

    Is there 1.0 Ω or less?

    YES 

    The DIAG-CAN_H wire is not open. Go to step 21.

    NO 

    Repair an open in the DIAG-CAN_H wire between the CAN gateway and the DLC (16P) No. 6.

  21. Open wire check (DIAG-CAN_L line)

    -1. Measure the resistance between test points 1 and 2.

    Test condition Vehicle OFF (LOCK) mode
      CAN gateway 16P connector: disconnected
    Test point 1 CAN gateway 16P connector (female terminals) No. 10:
    Test point 2 DLC (16P) (female terminals) No. 14:
    GHH380138Courtesy of HONDA, U.S.A., INC.
    GHH380139Courtesy of HONDA, U.S.A., INC.

    Is there 1.0 Ω or less?

    YES 

    The DIAG-CAN_L wire is not open. Go to step 22.

    NO 

    Repair an open in the DIAG-CAN_L wire between the CAN gateway and the DLC (16P) No. 14.

  22. Shorted wire check (DIAG-CAN_H line)

    -1. Measure the resistance between test points 1 and 2.

    Test condition Vehicle OFF (LOCK) mode
      CAN gateway 16P connector: disconnected
    Test point 1 DLC (16P) (female terminals) No. 6:
    Test point 2 Body ground
    GHH380141Courtesy of HONDA, U.S.A., INC.

    Is there 1 MΩ or more?

    YES 

    The DIAG-CAN_H wire is not shorted to ground. Go to step 23.

    NO 

    Repair a short in the DIAG-CAN_H wire between the CAN gateway and the DLC (16P) No. 6.

  23. Shorted wire check (DIAG-CAN_L line)

    -1. Measure the resistance between test points 1 and 2.

    Test condition Vehicle OFF (LOCK) mode
      CAN gateway 16P connector: disconnected
    Test point 1 DLC (16P) (female terminals) No. 14:
    Test point 2 Body ground
    GHH380143Courtesy of HONDA, U.S.A., INC.

    Is there 1 MΩ or more?

    YES 

    The DIAG-CAN_L wire is not shorted to ground. Go to step 24.

    NO 

    Repair a short in the DIAG-CAN_L wire between the CAN gateway and the DLC (16P) No. 14.

  24. Shorted wire check (DIAG-CAN_H line to DIAG-CAN_L line)

    -1. Measure the resistance between test points 1 and 2.

    Test condition Vehicle OFF (LOCK) mode
      CAN gateway 16P connector: disconnected
    Test point 1 DLC (16P) (female terminals) No. 6:
    Test point 2 DLC (16P) (female terminals) No. 14:
    GHH380146Courtesy of HONDA, U.S.A., INC.

    Is there 1 MΩ or more?

    YES 

    The DIAG-CAN_H wire and the DIAG-CAN_L wire are OK. Check for any authorized service information related to the DTCs or symptoms you are troubleshooting, or substitute a known-good CAN gateway .

    NO 

    Repair a short in the DIAG-CAN_H wire to the DIAG-CAN_L wire between DLC (16P) No. 6 and No. 14.

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