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DLC Circuit Troubleshooting (CAN Gateway (KA/KC)) (2020 2021)

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, similar vehicle and system, then 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 data link connector .

    NOTE:  Make sure the HDS is properly connected to the data link connector.

    -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  17.

  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
         

    DTC (PGM-FI)

    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 ELECTRIC BRAKE BOOSTER system, go to step  8.

    NO 

    If the HDS does not communicate with the IMMOBI (immobilizer) system, go to step  9.

    NO 

    If the HDS does not communicate with the ONE PUSH START system, go to step  10.

    NO 

    If the HDS does not communicate with the BODY ELECTRICAL system, go to step  11.

    NO 

    If the HDS does not communicate with the Real Time AWD System, go to step  12.

    NO 

    If the HDS does not communicate with the DRIVING SUPPORT system, go to step  13.

  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 terminal) No. 3:
    Test point 2 PCM connector A (50P) No. 37
    GHH429767Courtesy of HONDA, U.S.A., INC.

    Is there 1.0 Ω or less?

    YES 

    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
    GHH429769Courtesy 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 

    Go to step  14.

    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  14.

    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. 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  14.

    NO 

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

  8. Electric brake booster system check

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

    -2. Turn the vehicle to the ON mode, and watch the brake system indicator (amber).

    Does the brake system indicator (amber) come on and go off?

    YES 

    The electric brake booster system is OK. Go to step  14.

    NO 

    Go to the electric brake booster symptom troubleshooting for brake system indicator (red) and brake system indicator (amber) do not go off .

  9. Immobilizer 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 flash?

    YES 

    Go to the immobilizer system troubleshooting .

    NO 

    The immobilizer system is OK. Go to step  14.

  10. Keyless access system check

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

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

    Does the keyless access indicator stay on or the security indicator stay on or flash?

    YES 

    Go to the keyless access system symptom troubleshooting information .

    NO 

    Go to step  14.

  11. Body electrical system check

    -1. Do the gauge self-diagnostic function .

    -2. Check the gauge display.

    Is Error 2 indicated?

    YES 

    Go to the indicated DTC's troubleshooting.

    NO 

    Go to step  14.

  12. Real time AWD System check

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

    -2. Turn the vehicle to the ON mode, and watch the AWD system indicator on the multi-information display (MID).

    Is the AWD system indicator indicated?

    YES 

    Go to the real time AWD system symptom troubleshooting .

    NO 

    The real time AWD system is OK. Go to step  14.

  13. 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 and the LKAS indicator on the multi-information display (MID).

    Are the ACC indicator and/or the LKAS indicator indicated?

    YES 

    Go to the driving support system symptom troubleshooting; ACC , LKAS .

    NO 

    The driving support system is OK. Go to step 14.

  14. 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 data link connector.

    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
    • Body control module connector D (40P)
    • ANC/active sound control unit 20P connector
    • Immobilizer-keyless control unit 7P connector

    L-LINE 

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

    -4. Measure the resistance between data link connector (16P: ) No. 7 (K LINE line) and these connector terminals, or data link connector (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
    Body control module connector D (40P) No. 36
    ANC/active sound control unit 20P connector No. 14
    Immobilizer-keyless control unit 7P connector No. 3

    L-LINE 

    Connector Terminal
    Body control module connector F (36P) No. 21
    SRS unit connector A (39P) No. 33
    GHH429772Courtesy of HONDA, U.S.A., INC.

    Is there 1.0 Ω or less between the data link connector and the terminals in the chart?

    YES 

    Go to step 15.

    NO 

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

  15. 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 14-3, 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 Data link connector (16P) (female terminal) No. 7 and No. 15:
    Test point 2 Body ground
    GHH429774Courtesy of HONDA, U.S.A., INC.

    Is there any voltage?

    YES 

    Go to step  17.

    NO 

    Go to step 16.

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

    Continue to measure the voltage between data link connector (16P) No. 7 (K LINE line) and body ground, or data link connector (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
    • Body control module connector D (40P)
    • ANC/active sound control unit 20P connector
    • Immobilizer-keyless control unit 7P connector

    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 data link connector (16P) No. 7 (K LINE) and the audio-navigation unit *1 audio unit *2, the ANC/active sound control unit, immobilizer-keyless control unit, or the body control module, or data link connector (16P) No. 15 (L-LINE) and the body control module or the SRS unit.

  17. Body electrical system (B-CAN) check

    -1. Do the gauge self-diagnostic function .

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

    Is DTC U0029 and/or U0100 indicated?

    YES 

    Go to the PCM power and ground circuit troubleshooting .

    NO 

    Go to step 18.

  18. Open wire check (+B BACK UP line)

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

    -2. Disconnect the HDS from the data link connector.

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

    Test condition Vehicle OFF (LOCK) mode
    Test point 1 Data link connector (16P) (female terminal) No. 16:
    Test point 2 Body ground
    GHH429776Courtesy of HONDA, U.S.A., INC.

    Is there battery voltage?

    YES 

    Go to step 19.

    NO 

    Repair an open in the +B BACK UP wire between data link connector (16P) No. 16 and the No. A18 .

  19. Open wire check (GND line)

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

    Test condition Vehicle OFF (LOCK) mode
    Test point 1 Data link connector (16P) (female terminal) No. 4:
    Test point 2 Data link connector (16P) (female terminal) No. 16:
    GHH429779Courtesy of HONDA, U.S.A., INC.

    Is there battery voltage?

    YES 

    Go to step 20.

    NO 

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

  20. 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
      CAN gateway 16P connector: disconnected
    Test point 1 CAN gateway 16P connector (female terminals) No. 1:
    Test point 2 Body ground
    GHH429781Courtesy of HONDA, U.S.A., INC.

    Is there battery voltage?

    YES 

    Go to step 21.

    NO 

    Repair an open in the +B BACK UP wire between the CAN gateway and the No. A18 .

  21. 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
    GHH429783Courtesy of HONDA, U.S.A., INC.

    Is there battery voltage?

    YES 

    Go to step 22.

    NO 

    Repair an open in the IG1 METER wire between the CAN gateway and the No. D7 .

  22. Open wire check (GND lines)

    -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
    GHH429785Courtesy of HONDA, U.S.A., INC.

    Is there 1.0 Ω or less?

    YES 

    Go to step 23.

    NO 

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

  23. 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 Data link connector (16P) (female terminal) No. 6:
    GHH429788Courtesy of HONDA, U.S.A., INC.
    GHH429789Courtesy of HONDA, U.S.A., INC.

    Is there 1.0 Ω or less?

    YES 

    Go to step 24.

    NO 

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

  24. 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 Data link connector (16P) (female terminal) No. 14:
    GHH429792Courtesy of HONDA, U.S.A., INC.
    GHH429793Courtesy of HONDA, U.S.A., INC.

    Is there 1.0 Ω or less?

    YES 

    Go to step 25.

    NO 

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

  25. 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 Data link connector (16P) (female terminal) No. 6:
    Test point 2 Body ground
    GHH429795Courtesy of HONDA, U.S.A., INC.

    Is there 1 MΩ or more?

    YES 

    Go to step 26.

    NO 

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

  26. 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 Data link connector (16P) (female terminal) No. 14:
    Test point 2 Body ground
    GHH429797Courtesy of HONDA, U.S.A., INC.

    Is there 1 MΩ or more?

    YES 

    Go to step 27.

    NO 

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

  27. 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 Data link connector (16P) (female terminal) No. 6:
    Test point 2 Data link connector (16P) (female terminal) No. 14:
    GHH429800Courtesy of HONDA, U.S.A., INC.

    Is there 1 MΩ or more?

    YES 

    The DIAG-CAN_H wire and 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 data link connector (16P) No. 6 and No. 14.

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