DLC Circuit Troubleshooting
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, then check for communication problems.

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 12.
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 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 TPMS, 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:

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 9.
     
NO
     
     
     
4.
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 9.
     
NO
     
     
     
5.
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 9.
     
NO
     
     
     
6.
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
     
     
     
     
NO
     
     
     
The TPMS system is OK. Go to step 9.
7.
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
     
     
     
     
NO
     
     
     
The keyless access system is OK. Go to step 9.
8.
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 indicated?

     
YES
     
     
     
Go to the indicated DTC's troubleshooting.?
     
NO
     
     
     
The body electrical system is OK. Go to step 9.
9.
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
Body control module connector D (40P)
Audio unit connector A (24P)
Active sound control unit 20P connector

L-LINE
Body control module connector F (36P)
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:

L-LINE
Connector
Terminal
Body control module connector F (36P)
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 10.
     
NO
     
     
     
Repair an open in the wire between the DLC (K LINE wire or L-LINE wire) and the appropriate connector.?
10.
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 9-3, 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 12.
     
NO
     
     
     
Go to step 11.
11.
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
Body control module connector D (40P)
Audio unit connector A (24P)
Active sound control unit 20P connector

L-LINE
Body control module connector F (36P)
SRS unit connector A (39P)

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 body control module, the audio unit, the active sound control unit, or DLC (16P) No. 15 (L-LINE) and the body control module, the SRS unit.?
12.
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
     
     
     
     
NO
     
     
     
Go to step 13.
13.
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 14.
     
NO
     
     
     
Repair an open in the +B BACK UP wire between DLC (16P) No. 16 and the No. A18 fuse.?
14.
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) (female terminals) No. 16:


Is there battery voltage?

     
YES
     
     
     
The GND wire is OK. Go to step 15.
     
NO
     
     
     
Repair an open in the GND wire between DLC (16P) No. 4 and G501.?
15.
Open wire check (F-CAN_H line):

Open wire check (F-CAN_H line)
?1.
Jump the SCS line with the HDS, and wait more than 1 minute.


?2.
Disconnect the following connector.
PCM connector No. 2 (58P)

?3.
Check for continuity between test points 1 and 2.
Test condition
Vehicle OFF (LOCK) mode
 
PCM connector No. 2 (58P): disconnected
Test point 1
DLC (16P) (female terminals) No. 6:
Test point 2
PCM connector No. 2 (58P) No. 15


Is there 1.0 ? or less?

     
YES
     
     
     
The F-CAN_H wire is not open. Go to step 16.
     
NO
     
     
     
Repair an open in the F-CAN_H wire between PCM connector No. 2 terminal No. 15 and DLC (16P) No. 6.?
16.
Open wire check (F-CAN_L line):

Open wire check (F-CAN_L line)
?1.
Check for continuity between test points 1 and 2.
Test condition
Vehicle OFF (LOCK) mode
 
PCM connector No. 2 (58P): disconnected
Test point 1
DLC (16P) (female terminals) No. 14:
Test point 2
PCM connector No. 2 (58P) No. 27


Is there 1.0 ? or less?

     
YES
     
     
     
The F-CAN_L wire is not open. Check for any authorized service information related to the DTCs or symptoms you are troubleshooting, or substitute a known-good PCM, then recheck. If the HDS identifies the vehicle and the PCM was substituted, replace the original PCM.?
     
NO
     
     
     
Repair an open in the F-CAN_L wire between PCM connector No. 2 terminal No. 27 and DLC (16P) No. 14.?