DLC Circuit Troubleshooting (K20C2: With CAN gateway)

1.

HDS communication check:

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):

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.?


	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 ONE-PUSH START system, go to step 9.


	NO

If the HDS does not communicate with the TPMS, go to step 10.


	NO

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


	NO

If the HDS does not communicate with the BODY ELECTRICAL 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):

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.

Check for continuity 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. 3:
Test point 2	PCM connector A (50P) No. 37

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 (A37) and the CAN gateway.?

4.

Open wire check (F-CAN A_L line):

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 (50P): disconnected
Test point 1	CAN gateway 16P connector (female terminals) No. 11:
Test point 2	PCM connector A (50P) No. 36

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 (A36) and the CAN gateway.?

5.

SRS check:

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:

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:

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:

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 symptom troubleshooting information.?


	NO

The immobilizer system is OK. Go to step 14.

9.

Keyless access system check:

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

The keyless access system is OK. Go to step 14.

10.

TPMS check:

TPMS check

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

?2.	Turn the vehicle to the ON mode, and watch the low tire pressure/TPMS indicator.

Does the low tire pressure/TPMS indicator blink?


	YES

Go to the TPMS symptom troubleshooting.?


	NO

The TPMS system is OK. Go to step 14.

11.

A/T system check:

A/T system check

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

?2.	Turn the vehicle to the ON mode, and watch the shift position indicator.

Does the shift position indicator come on and go off?


	YES

The A/T system is OK. Go to step 14.


	NO

Go to the A/T system symptom troubleshooting.?

12.

Body electrical system check:

Body electrical system check

?1.	Do the gauge control module self-diagnostic function.

?2.	Check the gauge display.

Is Error 2 (without multi-information display) or B-CAN???ERROR (with multi-information display) indicated?


	YES

Go to the indicated DTC's troubleshooting.?


	NO

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

13.

Driving support system check:

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 CMBS indicator, the LKAS indicator, and the RDM indicator.

Does the ACC indicator, the CMBS indicator, the LKAS indicator, and/or the RDM indicator come on and go off?


	YES

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


	NO

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

14.

Open wire check (K LINE line or L-LINE line):

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, do the 12 volt battery terminal disconnection procedure and wait for at least 3 minutes.

K LINE

	Immobilizer-keyless control unit 7P connector (without keyless access system)
	Audio unit connector A (24P)
	Body control module connector D (40P)

L-LINE

	Body control module connector F (36P) (with keyless access system)
	SRS unit connector A (39P)

?4.

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

K LINE

Connector	Terminal
Immobilizer-keyless control unit 7P connector (without keyless access system)	No. 3
Audio unit connector A (24P)	No. 12
Body control module connector D (40P)	No. 36

L-LINE

Connector	Terminal
Body control module connector F (36P) (with keyless access system)	No. 21
SRS unit connector A (39P)	No. 33

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):

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	DLC (16P) (female terminals) No. 7 and No. 15:
Test point 2	Body ground

Is there any voltage?


	YES

Go to step 17.


	NO

Go to step 16.

16.

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

Shorted wire check (K LINE line, L-LINE line)

?1.

Continue to measure the voltage between DLC (16P) No. 7 (K LINE line) and body ground, or DLC (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

	Immobilizer-keyless control unit 7P connector (without keyless access system)
	Audio unit connector A (24P)
	Body control module connector D (40P)

L-LINE

	Body control module connector F (36P) (with keyless access system)
	SRS unit connector A (39P) NOTE: Before disconnecting the SRS unit connector, do the 12 volt battery terminal disconnection procedure and wait for at least 3 minutes.

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 DLC (16P) No. 7 (K LINE) and the immobilizer-keyless control unit, the audio unit, the body control module, or DLC (16P) No. 15 (L-LINE) and the body control module, the SRS unit.?

17.

Body electrical system check:

Body electrical system check

?1.	Do 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

Do the PCM power and ground circuit troubleshooting.?


	NO

Go to step 18.

18.

Open wire check (+B BACK UP line):

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) (female terminals) No. 16:
Test point 2	Body ground

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 (16P) No. 16 and the No. A18 fuse.?

19.

Open wire check (GND line):

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) No. (female terminals) No. 16:

Is there battery voltage?


	YES

The GND wire is OK. Go to step 20.


	NO

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

20.

Open wire check (IG1 METER line):

Open wire check (IG1 METER line)

?1.

Disconnect the following connector.

CAN gateway 16P 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 16P connector: disconnected
Test point 1	CAN gateway 16P connector (female terminals) No. 9:
Test point 2	Body ground

Is there battery voltage?


	YES

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


	NO

Repair an open in the IG1 METER wire between the CAN gateway and the No. B7 fuse.?

21.

Open wire check (GND line):

Open wire check (GND line)

?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

Is there continuity?


	YES

The GND wire is OK. Go to step 22.


	NO

Repair an open in the GND wire between the CAN gateway and G502.?

22.

Open wire check (DIAG-CAN_H line):

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:

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 DLC (16P) No. 6.?

23.

Open wire check (DIAG-CAN_L line):

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:

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 DLC (16P) No. 14.?

24.

Shorted wire check (DIAG-CAN_H line):

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

Is there continuity?


	YES

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


	NO

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

25.

Shorted wire check (DIAG-CAN_L line):

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

Is there continuity?


	YES

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


	NO

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

26.

Shorted wire check (DIAG-CAN_H line to DIAG-CAN_L line):

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:

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.?


	NO

The DIAG-CAN_H wire and 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, then recheck. If the symptom/indication goes away and the CAN gateway was substituted, replace the original CAN gateway.?