DLC Circuit Troubleshooting (2016 2017)

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 checking for communication problems.

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 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	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 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 IMMOBI (immobilizer) system, go to step 8.

   NO 

   If the HDS does not communicate with the keyless access system, go to step 9.

   NO 

   Mexico model: If the HDS does not communicate with the TPMS, 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 DRIVING SUPPORT system, go to step 12.

   NO 

   If the HDS does not communicate with the P-AWS 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.

   -3. Disconnect the following connectors.

   CAN gateway 24P connector

   PCM connector A (51P)

   -4. Check for continuity between test points 1 and 2.

   Test condition	Vehicle OFF (LOCK) mode
   	CAN gateway 24P connector: disconnected
   	PCM connector A (51P): disconnected
   Test circuit	F-CAN A_H
   Test point 1	CAN gateway 24P connector No. 14 (BLU)
   Test point 2	PCM connector A (51P) No. 9 (BLU)

   Courtesy of HONDA, U.S.A., INC.

   Is there continuity?

   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 (A9) and the CAN gateway.

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

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

   Test condition	Vehicle OFF (LOCK) mode
   	CAN gateway 24P connector: disconnected
   	PCM connector A (51P): disconnected
   Test circuit	F-CAN A_L
   Test point 1	CAN gateway 24P connector No. 15 (PNK)
   Test point 2	PCM connector A (51P) No. 10 (PNK)

   Courtesy of HONDA, U.S.A., INC.

   Is there continuity?

   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 (A10) 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 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 EPS symptom troubleshooting for EPS indicator does not go off, and no DTCs are stored .

8. Immobilizer system check

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

   -2. Turn the vehicle to 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 14.

9. 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.

   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 14.

10. TPMS check

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

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

    Does the TPMS indicator stay on?

    YES 

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

    NO 

    The TPMS system is OK. 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 

    The body electrical system is OK. Go to step 14.

12. 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 LKAS indicator, the LDW indicator, and/or the FCW indicator.

    Does the ACC indicator, the LKAS indicator, the LDW indicator, and/or the FCW indicator come on and go off?

    YES 

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

    NO 

    Go to the driving support general troubleshooting information or the adaptive cruise control (ACC) general troubleshooting information .

13. Precision all wheel steer system check

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

    -2. Turn the vehicle to the ON mode, and watch the precision all wheel steer system indicator.

    Does the precision all wheel steer system indicator come on and go off?

    YES 

    The precision all wheel steer system is OK. Go to step 14.

    NO 

    Go to the precision all wheel steer system symptom troubleshooting for precision all wheel steer system indicator does not go off, and no DTCs are stored .

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 DLC.

    -3. Disconnect the control unit (s) on the K LINE or L-LINE that does not communicate.

    NOTE:  Before disconnecting front passenger's weight sensor unit A (6P) or SRS unit connector A (39P), do the battery terminal disconnection procedure and wait for at least 3 minutes.

    K LINE 

    • VSA modulator-control unit 38P connector
    • Audio-navigation unit connector A (24P)
    • ANC/active sound control unit 20P connector
    • Keyless access/TPMS control unit C (20P) (USA and Canada models)
    • Keyless access control unit connector B (28P) (Mexico model)
    • TPMS control unit 20P connector (Mexico model)
    • Front passenger's weight sensor unit A (6P) (USA and Canada models)
    • Driver's under-dash fuse/relay box connector G (16P)

    L-LINE 

    • Keyless access/TPMS control unit C (20P) (USA and Canada models)
    • Keyless access control unit connector C (24P) (Mexico model)
    • SRS unit connector A (39P)

    -4. Check for continuity between DLC (16P) No. 7 (LT BLU) and these connector terminals (K LINE line), or DLC (16P) No. 15 (YEL) and these connector terminals (L-LINE line):

    K LINE 

    Connector	Terminal
    VSA modulator-control unit 21P connector	No. 11 (LT BLU)
    Audio-navigation unit connector A (24P)	No. 13 (LT BLU)
    ANC/active sound control unit 20P connector	No. 14 (LT BLU)
    Keyless access/TPMS control unit C (20P) (USA and Canada models)	No. 4 (LT BLU)
    Keyless access control unit connector B (28P) (Mexico model)	No. 20 (LT BLU)
    TPMS control unit 20P connector (Mexico model)	No. 4 (LT BLU)
    Front passenger's weight sensor unit A (6P) (USA and Canada models)	No. 2 (BLK)
    Driver's under-dash fuse/relay box connector G (16P)	No. 11 (LT BLU)

    L-LINE 

    Connector	Terminal
    Keyless access/TPMS control unit C (20P) (USA and Canada models)	No. 6 (YEL)
    Keyless access control unit connector C (24P) (Mexico model)	No. 3 (YEL)
    SRS unit connector A (39P)	No. 19 (YEL)

    Is there continuity between the DLC and the terminals in the chart?

    YES 

    Go to step 15.

    NO 

    Repair an open in the wire between the DLC (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 battery negative terminal is disconnected in step 14, do the 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 circuit	K LINE
    Test point 1	DLC (16P) No. 7 (LT BLU)
    Test point 2	Body ground

    Test circuit	L-LINE
    Test point 1	DLC (16P) No. 15 (YEL)
    Test point 2	Body ground

    Courtesy 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)

    -1. Continue to measure the voltage between DLC (16P) No. 7 (LT BLU) and body ground (K LINE line), or DLC (16P) No. 15 (YEL) and body ground (L-LINE line) 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 

    • VSA modulator-control unit 38P connector
    • Audio-navigation unit connector A (24P)
    • ANC/active sound control unit 20P connector
    • Keyless access/TPMS control unit C (20P) (USA and Canada models)
    • Keyless access control unit connector B (28P) (Mexico model)
    • TPMS control unit 20P connector (Mexico model)
    • Front passenger's weight sensor unit A (6P) (USA and Canada models)

      NOTE:  Before disconnecting front passenger's weight sensor unit A (6P), do the battery terminal disconnection procedure and wait for at least 3 minutes, and do the battery terminal reconnection procedure before turning the vehicle to the ON mode.

    • Driver's under-dash fuse/relay box connector G (16P)

    L-LINE 

    • Keyless access/TPMS control unit C (20P) (USA and Canada models)
    • Keyless access control unit connector C (24P) (Mexico model)
    • SRS unit connector A (39P)

      NOTE:  Before disconnecting SRS unit connector A (39P), do the battery terminal disconnection procedure and wait for at least 3 minutes, and do the battery terminal reconnection procedure before turning the vehicle to the ON mode.

    Does voltage come back when one of the above components is disconnected?

    YES 

    Replace the part that any voltage was detected when it was disconnected.

    NO 

    Repair a short in the wire between DLC terminal No. 7 (K LINE) and the VSA modulator-control unit, the audio-navigation unit, the ANC/active sound control unit, the keyless access/TPMS control unit, the keyless access control unit, the TPMS control unit, the front passenger's weight sensor unit, or the driver's under-dash fuse/relay box (MICU), the DLC terminal No. 15 (L-LINE) and the keyless access/TPMS control unit, the keyless access control unit, 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 

    Do 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 DLC.

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

    Test condition	Vehicle OFF (LOCK) mode
    Test circuit	+B BACK UP
    Test point 1	DLC (16P) No. 16 (PNK)
    Test point 2	Body ground

    Courtesy of HONDA, U.S.A., INC.

    Is there battery voltage?

    YES 

    The +B BACK UP wire is OK. Go to step 19.

    NO 

    Repair an open in the +B BACK UP wire between DLC terminal No. 16 and the No. C16 (10 A) fuse in the under-hood fuse/relay box.

19. Open wire check (GND line)

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

    Test condition	Vehicle OFF (LOCK) mode
    Test circuit	GND, +B BACK UP
    Test point 1	DLC (16P) No. 4 (BLK)
    Test point 2	DLC (16P) No. 16 (PNK)

    Courtesy of HONDA, U.S.A., INC.

    Is there battery voltage?

    YES 

    The GND wire is OK. Go to step 20.

    NO 

    Repair an open in the GND wire between DLC terminal No. 4 and G503.

20. Open wire check (IG1 DR2 line)

    -1. Disconnect the following connector.

    CAN gateway 24P connector

    -2. Turn the vehicle to the ON mode.

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

    Test condition	Vehicle ON mode
    	CAN gateway 24P connector: disconnected
    Test circuit	IG1 DR2
    Test point 1	CAN gateway 24P connector No. 21 (WHT)
    Test point 2	Body ground

    Courtesy of HONDA, U.S.A., INC.

    Is there battery voltage?

    YES 

    The IG1 DR2 wire is OK. Go to step 21.

    NO 

    Repair an open in the IG1 DR2 wire between the CAN gateway and the No. D24 (7.5 A) fuse in the driver's under-dash fuse/relay box.

21. Open wire check (GND lines)

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

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

    Test condition	Vehicle OFF (LOCK) mode
    	CAN gateway 24P connector: disconnected
    Test circuit	GND
    Test point 1	CAN gateway 24P connector No. 18 (BLK)
    Test point 2	Body ground

    Test circuit	GND
    Test point 1	CAN gateway 24P connector No. 19 (BLK)
    Test point 2	Body ground

    Courtesy of HONDA, U.S.A., INC.

    Is there continuity?

    YES 

    The GND wires are OK. Go to step 22.

    NO 

    Repair an open in the GND wire between the CAN gateway and G501.

22. Open wire check (DIAG-CAN_H line)

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

    Test condition	Vehicle OFF (LOCK) mode
    	CAN gateway 24P connector: disconnected
    Test circuit	DIAG-CAN_H
    Test point 1	CAN gateway 24P connector No. 3 (WHT)
    Test point 2	DLC (16P) No. 6 (WHT)

    Courtesy of HONDA, U.S.A., INC.

    Is there continuity?

    YES 

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

    NO 

    Repair an open in the DIAG-CAN_H wire between the CAN gateway and the DLC.

23. Open wire check (DIAG-CAN_L line)

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

    Test condition	Vehicle OFF (LOCK) mode
    	CAN gateway 24P connector: disconnected
    Test circuit	DIAG-CAN_L
    Test point 1	CAN gateway 24P connector No. 2 (TAN)
    Test point 2	DLC (16P) No. 14 (TAN)

    Courtesy of HONDA, U.S.A., INC.

    Is there continuity?

    YES 

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

    NO 

    Repair an open in the DIAG-CAN_L wire between the CAN gateway and the DLC.

24. Shorted wire check (DIAG-CAN_H line)

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

    Test condition	Vehicle OFF (LOCK) mode
    	CAN gateway 24P connector: disconnected
    Test circuit	DIAG-CAN_H
    Test point 1	DLC (16P) No. 6 (WHT)
    Test point 2	Body ground

    Courtesy of HONDA, U.S.A., INC.

    Is there continuity?

    YES 

    Repair a short in the DIAG-CAN_H wire between the CAN gateway and the DLC.

    NO 

    The DIAG-CAN_H wire is not short to ground. Go to step 25.

25. Shorted wire check (DIAG-CAN_L line)

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

    Test condition	Vehicle OFF (LOCK) mode
    	CAN gateway 24P connector: disconnected
    Test circuit	DIAG-CAN_L
    Test point 1	DLC (16P) No. 14 (TAN)
    Test point 2	Body ground

    Courtesy of HONDA, U.S.A., INC.

    Is there continuity?

    YES 

    Repair a short in the DIAG-CAN_L wire between the CAN gateway and the DLC.

    NO 

    The DIAG-CAN_L wire is not short to ground. Go to step 26.

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

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

    Test condition	Vehicle OFF (LOCK) mode
    	CAN gateway 24P connector: disconnected
    Test circuit	DIAG-CAN_H, DIAG-CAN_L
    Test point 1	DLC (16P) No. 6 (WHT)
    Test point 2	DLC (16P) No. 14 (TAN)

    Courtesy of HONDA, U.S.A., INC.

    Is there continuity?

    YES 

    Repair a short in the DIAG-CAN_H wire to the DIAG-CAN_L wire between DLC terminals No. 6 and No. 14.

    NO 

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