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DLC Circuit (R20A5) (2013 2014 2015)

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. HDS communication check

    -1. Press the engine start/stop button to select the OFF mode.

    -2. Connect the HDS to the DLC.

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

    -3. Press the engine start/stop button to select the ON mode, and turn on the HDS.

    Does the HDS identify the vehicle?

    YES 

    Go to step 2.

    NO 

    Go to step 12.

  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 Freeze Frame
           

    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 3.

    NO 

    If the HDS does not communicate with the VSA system, go to step 4.

    NO 

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

    NO 

    If the HDS does not communicate with the IMMOBI (immobilizer) system, go to step 6.

    NO 

    If the HDS does not communicate with the ONE PUSH START system, go to step 7.

    NO 

    If the HDS does not communicate with the BODY ELECTRICAL system, go to step 8.

  3. SRS check

    -1. Press the engine start/stop button to select the OFF mode.

    -2. Press the engine start/stop button to select 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 9.

    NO 

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

  4. VSA system check

    -1. Press the engine start/stop button to select the OFF mode.

    -2. Press the engine start/stop button to select 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 9.

    NO 

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

  5. EPS system check

    -1. Press the engine start/stop button to select the OFF 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 9.

    NO 

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

  6. Immobilizer system check

    -1. Press the engine start/stop button to select the OFF mode.

    -2. Press the engine start/stop button to select the ON mode, and watch the immobilizer indicator.

    Does the immobilizer indicator stay on or flash?

    YES 

    Go to the immobilizer system troubleshooting .

    NO 

    The immobilizer system is OK. Go to step 9.

  7. Keyless access system check

    -1. Press the engine start/stop button to select the OFF mode.

    -2. Press the engine start/stop button to select the ON mode, and watch the keyless access indicator.

    Does the keyless access indicator stay on?

    YES 

    Go to the keyless access system general troubleshooting information .

    NO 

    The keyless access system is OK. Go to step 9.

  8. 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 

    The body electrical system is OK. Go to step 9.

  9. Determine possible failure area (K LINE or DIAG-H line, others)

    -1. Press the engine start/stop button to select the OFF mode.

    -2. Disconnect the HDS from the DLC.

    -3. Check for continuity between test points 1 and 2.

    Test condition OFF mode
    Test circuit K LINE
    Test point 1 DLC (16P) No. 7 (LT BLU)
    Test point 2 Body ground
    Test circuit DIAG-H (with keyless access system)
    Test point 1 DLC (16P) No. 1 (RED)
    Test point 2 Body ground
    GHH473485Courtesy of HONDA, U.S.A., INC.

    Is there continuity?

    YES 

    Go to step 10.

    NO 

    Go to step 11.

  10. Shorted wire check (K LINE, DIAG-H line):

    Continue to check for continuity between DLC terminal No. 7 or No. 1 and body ground, while disconnecting these parts, one at a time:

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

    YES 

    Replace the part that caused an open when it was disconnected.

    NO 

    Repair a short in the wire between DLC terminal No. 7 (K LINE) and the SRS unit, the VSA modulator-control unit, the EPS control unit, the keyless access control unit, the audio unit, the driver's under-dash fuse/relay box, or the ANC unit, the DLC terminal No. 1 (DIAG-H line) and the power control unit.

  11. Open wire check (K LINE, DIAG-H line)

    -1. Connect terminals A and B with a jumper wire.

    Terminal A DLC (16P) No. 7 (LT BLU)
    Terminal B Body ground
    Terminal A DLC (16P) No. 1 (RED)
    Terminal B Body ground
    GHH473486Courtesy of HONDA, U.S.A., INC.

    -2. Check for continuity between body ground and these connector terminals:

    K LINE 

    Connector Terminal
    SRS unit connector A (39P) No. 5 (LT BLU)
    VSA modulator-control unit 22P connector No. 16 (LT BLU)
    EPS control unit connector A (11P) No. 7 (LT BLU)
    TPMS control unit 36P connector (USA and Mexico models) No. 4 (LT BLU)
    Audio unit connector A (24P) No. 13 (LT BLU)
    Under-dash fuse/relay box connector Q (16P) No. 14 (LT BLU)
    ANC/Active sound control unit 20P connector (with ANC/Active sound control) No. 14 (LT BLU)
    Keyless access control unit connector B (32P) No. 13 (LT BLU)
    Back-up control unit 36P connector No. 27 (LT BLU)
    Audio-navigation unit connector A (24P) (with navigation) No. 13 (LT BLU)

    DIAG-H line 

    Connector Terminal
    Power control unit connector C (36P) No. 16 (RED)

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

    YES 

    The K LINE wire and DIAG-H wire are OK. Replace the part that does not communicate with the HDS.

    NO 

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

  12. 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 

    Do the PCM power and ground circuit troubleshooting .

    NO 

    Go to step 13.

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

    -1. Press the engine start/stop button to select the OFF mode.

    -2. Disconnect the HDS from the DLC.

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

    Test condition OFF mode
    Test circuit +B BACK UP
    Test point 1 DLC (16P) No. 16 (WHT)
    Test point 2 Body ground
    GHH473487Courtesy of HONDA, U.S.A., INC.

    Is there battery voltage?

    YES 

    The +B BACK UP wire is OK. Go to step 14.

    NO 

    Repair an open in the +B BACK UP wire between DLC terminal No. 16 and the No. A29 (10 A) fuse in the under-hood fuse/relay box.

  14. Open wire check (GND line)

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

    Test condition OFF mode
    Test circuit GND, +B BACK UP
    Test point 1 DLC (16P) No. 4 (BLK)
    Test point 2 DLC (16P) No. 16 (WHT)
    GHH473488Courtesy of HONDA, U.S.A., INC.

    Is there battery voltage?

    YES 

    The GND wire is OK. Go to step 15.

    NO 

    Repair an open in the GND wire between DLC terminal No. 4 and G501.

  15. Open wire check (F CAN-H line)

    -1. Connect the HDS to the DLC.

    -2. Jump the SCS line with the HDS.

    -3. Disconnect the following connector.

    PCM connector A (49P)

    -4. Disconnect the HDS from the DLC.

    -5. Check for continuity between test points 1 and 2.

    Test condition OFF mode
      PCM connector A (49P): disconnected
    Test circuit F CAN-H
    Test point 1 DLC (16P) No. 6 (WHT)
    Test point 2 PCM connector A (49P) No. 3 (WHT)
    GHH473489Courtesy of HONDA, U.S.A., INC.

    Is there continuity?

    YES 

    The F CAN-H wire is OK. Go to step 16.

    NO 

    Repair an open in the F CAN-H wire between the PCM (A3) and DLC terminal No. 6.

  16. Open wire check (F CAN-L line)

    -1. Check for continuity between test points 1 and 2.

    Test condition OFF mode
      PCM connector A (49P): disconnected
    Test circuit F CAN-L
    Test point 1 DLC (16P) No. 14 (RED)
    Test point 2 PCM connector A (49P) No. 4 (RED)
    GHH473490Courtesy of HONDA, U.S.A., INC.

    Is there continuity?

    YES 

    The F CAN-L wire is OK. Update the PCM if it does not have the latest software, or substitute a known-good PCM , then recheck. If the symptom/indication goes away and the PCM was updated, troubleshooting is complete. If the symptom/indication goes away and the PCM was substituted, replace the original PCM .

    NO 

    Repair an open in the F CAN-L wire between the PCM (A4) and DLC terminal No. 14.

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