DLC Circuit Troubleshooting (V6, With SH-AWD) (2018-19)

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.

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 15.

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.

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

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

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

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

If the HDS does not communicate with the IMMOBI (immobilizer) system, go to step 8.

If the HDS does not communicate with the ONE PUSH START system, go to step 9.

If the HDS does not communicate with the BODY ELECTRICAL system, go to step 10.

If the HDS does not communicate with the DRIVING SUPPORT system, go to step 11.

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 (51P)

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

Test condition	Vehicle OFF (LOCK) mode
	CAN gateway 16P connector: disconnected
	PCM connector A (51P): disconnected
Test point 1	CAN gateway 16P connector (female terminals) No. 3:
Test point 2	PCM connector A (51P) No. 9 - Refer to: PCM Connector for Inputs and Outputs (V6) (2018-19)

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

Is there continuity?

YES

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

Repair an open in the F-CAN A_H wire between the PCM (A9) and the CAN gateway.

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 16P connector: disconnected
	PCM connector A (51P): disconnected
Test point 1	CAN gateway 16P connector (female terminals) No. 11:
Test point 2	PCM connector A (51P) No. 10 - Refer to: PCM Connector for Inputs and Outputs (V6) (2018-19)

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 - Refer to: PCM Power and Ground Circuit Troubleshooting (V6) .

Repair an open in the F-CAN A_L wire between the PCM (A10) and the CAN gateway.

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 12.

NO

Go to the symptom troubleshooting for SRS indicator stays on, but no DTCs are stored, or cannot be read - Refer to: SRS indicator stays on, but no DTCs are stored, or cannot be read (2018-19) .
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 12.

NO

Go to the symptom troubleshooting for ABS indicator, brake system indicator (red), VSA indicator, and brake system indicator (amber) do not go off - Refer to: ABS/brake system indicator (red), VSA indicator, and brake system indicator (amber) do not go off (With Auto Idle Stop System) (2018-19) .
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 12.

NO

Go to the EPS symptom troubleshooting for EPS indicator does not go off, and no DTCs are stored - Refer to: EPS indicator does not go off, and no DTCs are stored (With Auto Idle Stop System) (2018-19) .
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 12.
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 12.
Body electrical system check
- 1. Perform 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 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 12.

NO

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

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 the SRS unit connector, perform the 12 volt battery terminal disconnection procedure and wait at least 3 minutes - Refer to: 12 Volt Battery Duct Removal and Installation (2017-19) .

K LINE

EPS control unit connector A (11P)
Audio-navigation unit connector A (24P)
ANC/active sound control unit 20P connector
Keyless access/TPMS control unit connector C (20P)
Front passenger's weight sensor unit A (6P)
Under-dash fuse/relay box connector R (16P)

L LINE

Keyless access/TPMS control unit connector C (20P)
SRS unit connector A (39P)

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

K LINE

Connector	Terminal
EPS control unit connector A (11P)	No. 7
Audio-navigation unit connector A (24P)	No. 13
ANC/active sound control unit 20P connector	No. 14
Keyless access/TPMS control unit connector C (20P)	No. 4

L LINE

Connector	Terminal
Keyless access/TPMS control unit connector C (20P)	No. 6
SRS unit connector A (39P)	No. 33

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

YES

Go to step 13.

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

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

- 1. Reconnect all connectors.

- 2. Turn the vehicle to the ON mode.

- 3. 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

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

Is there any voltage?

YES

Go to step 15.

Go to step 14.

Shorted wire check (K LINE line, L LINE line)
- 1. Continue to measure the voltage between DLC (16P) No. 7 and body ground (K LINE line), or DLC (16P) No. 15 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.
- Before disconnecting the SRS unit connector, perform the 12 volt battery terminal disconnection procedure and wait at least 3 minutes - Refer to: 12 Volt Battery Duct Removal and Installation .
K LINE
- EPS control unit connector A (11P)
- Audio-navigation unit connector A (24P)
- ANC/active sound control unit 20P connector
- Keyless access/TPMS control unit connector C (20P)
L LINE
- Keyless access/TPMS control unit connector C (20P)
- SRS unit connector A (39P)
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 (16P) No. 7 (K LINE) and the EPS control unit, the audio-navigation unit, the ANC/active sound control unit, the keyless access/TPMS control unit, or the under-dash fuse/relay box (MICU), or DLC (16P) No. 15 (L LINE) and the keyless access/TPMS control unit, or SRS unit.
Body electrical system (B-CAN) check
- 1. Perform 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

Go to the PCM power and ground circuit troubleshooting - Refer to: PCM Power and Ground Circuit Troubleshooting (V6) .

NO

Go to step 16.

Open wire check (+B BACK UP line)

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

- 2. Disconnect the HDS from the DLC.

- 3. Disconnect the following connector.

CAN gateway 16P connector

- 4. 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
Test point 1	CAN gateway 16P connector (female terminals) No. 1:
Test point 2	Body ground

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

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

Is there battery voltage?

YES

The +B BACK UP wire is OK. Go to step 17.

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

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:

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

Is there battery voltage?

YES

The GND wire is OK. Go to step 18.

Repair an open in the GND wire between DLC (16P) No. 4 and G306.

Open wire check (IG1 MICU (DC) 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

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

Is there battery voltage?

YES

The IG1 MICU (DC) wire is OK. Go to step 19.

Repair an open in the IG1 MICU (DC) wire between the CAN gateway and the No. GB (7.5 A) fuse in under-dash sub fuse/relay box B.

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 16P connector: disconnected
Test point 1	CAN gateway 16P connector (female terminals) No. 12:
Test point 2	Body ground

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

Is there continuity?

YES

The GND wires are OK. Go to step 20.

Repair an open in the GND wire (s) between the CAN gateway and G304.

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 16P connector: disconnected
Test point 1	CAN gateway 16P connector (female terminals) No. 2:
Test point 2	DLC (16P) (female terminals) No. 6:

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

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

Is there continuity?

YES

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

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

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 16P connector: disconnected
Test point 1	CAN gateway 16P connector (female terminals) No. 10:
Test point 2	DLC (16P) (female terminals) No. 14:

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

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

Is there continuity?

YES

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

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

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 16P connector: disconnected
Test point 1	DLC (16P) (female terminals) No. 6:
Test point 2	Body ground

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

Is there continuity?

YES

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

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

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 16P connector: disconnected
Test point 1	DLC (16P) (female terminals) No. 14:
Test point 2	Body ground

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

Is there continuity?

YES

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

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

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 16P connector: disconnected
Test point 1	DLC (16P) (female terminals) No. 6:
Test point 2	DLC (16P) (female terminals) No. 14:

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 (16P) No. 6 and No. 14.

The DIAG-CAN_H wire to 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 .