DLC Circuit Troubleshooting (2016, With CAN Gateway)

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, 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 13.

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.

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

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

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

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

If the HDS does not communicate with the DRIVING SUPPORT system, go to step 8.

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

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 point 1	CAN gateway 24P connector No. 14
Test point 2	PCM connector A (51P) No. 9 - Refer to: PCM Connector for Inputs and Outputs (2016), .

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 24P connector: disconnected
	PCM connector A (51P): disconnected
Test point 1	CAN gateway 24P connector No. 15
Test point 2	PCM connector A (51P) No. 10 - Refer to: PCM Connector for Inputs and Outputs (2016)

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 (2016), .

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

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 10.

NO

Go to the symptom troubleshooting for ABS indicator (red), brake system indicator, VSA indicator, and brake system indicator (amber) do not go off - Refer to: VSA System Symptom Troubleshooting - ABS indicator, brake system indicator (red), VSA indicator, and brake system indicator (amber) do not go off (With CAN Gateway) (2016), .
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 10.

NO

Go to the EPS symptom troubleshooting for EPS indicator does not go off, and no DTCs are stored - Refer to: EPS Symptom Troubleshooting - EPS indicator does not go off, and no DTCs are stored (Without CAN Gateway) (2016), .
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 - Refer to: Keyless Access System Symptom Troubleshooting Information (2016) .

NO

The keyless access system is OK. Go to step 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 multi-information display.

Does the E-pretensioner indicator stays on?

YES

Go to the driving support general troubleshooting information .

NO

The driving support system is OK. Go to step 10.
Body electrical system check
-1. Do the gauge self-diagnostic function.

- 2. Check the gauge display.

Is B-CAN------ERROR indicated?

YES

Go to the indicated DTC's troubleshooting.

NO

The body electrical system is OK. Go to step 10.

Open wire check (K LINE line or P 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 P LINE that does not communicate.

K LINE

VSA modulator-control unit 38P connector
Audio-navigation unit connector A (24P)
EPS control unit connector A (11P)
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 G (16P)

P LINE

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

- 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 (P LINE line):

K LINE

Connector	Terminal
VSA modulator-control unit 38P connector	No. 11
ANC/active sound control unit 20P connector	No. 14
EPS control unit connector A (11P)	No. 7
Audio-navigation unit connector A (24P)	No. 13
Keyless access/TPMS control unit connector C (20P)	No. 4
Front passenger's weight sensor unit A (6P)	No. 2
Driver's under-dash fuse/relay box connector G (16P)	No. 13

P LINE

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

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

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

YES

Go to step 11.

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

Determine possible failure area (short in K LINE line or P 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) 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 13.

Go to step 12.

Shorted wire check (K LINE line, P 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 (P 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)
- EPS control unit connector A (11P)
- 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 G (16P)
P LINE
- Keyless access/TPMS control unit connector C (20P)
Does continuity go away 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 VSA modulator-control unit, the ANC/active sound control unit, the EPS control unit, the audio-navigation unit, the keyless access/TPMS control unit, the front passenger's weight sensor unit, the driver's under-dash fuse/relay box (MICU), or DLC (16P) No. 15 (P LINE) and the keyless access/TPMS control unit.
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 - Refer to: PCM Power and Ground Circuit Troubleshooting (2016) .

NO

Go to step 14.

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) No. 16
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 15.

Repair an open in the +B BACK UP wire between DLC (16P) No. 16 and the No. C16 (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) No. 4
Test point 2	DLC (16P) No. 16

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

Is there battery voltage?

YES

The GND wire is OK. Go to step 16.

Repair an open in the GND wire between DLC (16P) No. 4 and G501.

Open wire check (IG1 MICU (DC/DC) 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 point 1	CAN gateway 24P connector No. 21
Test point 2	Body ground

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

Is there battery voltage?

YES

The IG1 MICU (DC/DC) wire is OK. Go to step 17.

Repair an open in the IG1 MICU (DC/DC) wire between the CAN gateway and DC-DC converter IG1 relay 2 in the auxiliary under-dash fuse/relay box.

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 point 1	CAN gateway 24P connector No. 18 and No. 19
Test point 2	Body ground

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

Is there continuity?

YES

The GND wires are OK. Go to step 18.

Repair an open in the GND wire (s) between the CAN gateway and G504.

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 point 1	CAN gateway 24P connector No. 3
Test point 2	DLC (16P) No. 6

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

Is there continuity?

YES

The DIAG-CAN_H wire is not open. Go to step 19.

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 24P connector: disconnected
Test point 1	CAN gateway 24P connector No. 2
Test point 2	DLC (16P) No. 14

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

Is there continuity?

YES

The DIAG-CAN_L wire is not open. Go to step 20.

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 24P connector: disconnected
Test point 1	DLC (16P) 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 21.

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 24P connector: disconnected
Test point 1	DLC (16P) 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 22.

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 24P connector: disconnected
Test point 1	DLC (16P) No. 6
Test point 2	DLC (16P) 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 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 .