Fig. 8: DLC Circuit Troubleshooting Flow Chart (2 Of 2)
Courtesy of AMERICAN HONDA MOTOR CO., INC.
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, like vehicle and system, and checking for
communication problems.
1. HDS communication check:
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1. Turn the ignition switch to LOCK (0).
2. Connect the HDS to the DLC.
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NOTE:
Make sure the HDS is properly connected to the DLC.
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3. Turn the ignition switch to ON (II), 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):
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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 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 TPMS, go to step 5.
NO : If the HDS does not communicate with the EPS system, go to step 6.
NO : If the HDS does not communicate with the IMMOBI (immobilizer) system, go to step 7.
NO : If the HDS does not communicate with the BODY ELECTRICAL system, go to step 8.
3. SRS check:
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1. Turn the ignition switch to LOCK (0).
2. Turn the ignition switch to ON (II), and watch the SRS indicator.
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Does the SRS indicator come on and go off?
YES : The SRS is OK. Go to step 9.
NO : Go to the symptom troubleshooting for SRS indicator stays on, but no DTCs are stored, or
cannot be read
4. VSA system check:
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1. Turn the ignition switch to LOCK (0).
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2. Turn the ignition switch to ON (II), 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 : Go to the SYMPTOM TROUBLESHOOTING FOR ABS INDICATOR, BRAKE
SYSTEM INDICATOR, AND VSA INDICATOR DO NOT GO OFF .
5. TPMS check:
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1. Turn the ignition switch to LOCK (0).
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2. Turn the ignition switch to ON (II), and watch the TPMS indicator.
Does the TPMS indicator come on and go off?
YES : The TPMS is OK. Go to step 9.
NO : Go to the symptom troubleshooting for TPMS indicator does not go off, and no DTCs are
stored
6. EPS system check:
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1. Turn the ignition switch to LOCK (0).
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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 : Go to the EPS SYMPTOM TROUBLESHOOTING FOR EPS INDICATOR DOES
NOT GO OFF, AND NO DTCS ARE STORED .
7. Immobilizer system check:
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1. Turn the ignition switch to LOCK (0).
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2. Turn the ignition switch to ON (II), 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 9.
8. Body electrical system check:
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1. DO THE GAUGE SELF-DIAGNOSTIC FUNCTION .
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2. Check the gauge display.
Is Error 2 or Error 12 indicated?
YES : GO TO THE BODY ELECTRICAL SYSTEM DTC'S TROUBLESHOOTING .
NO : The body electrical system is OK. Go to step 9.
9. Determine possible failure area (K LINE, others):
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1. Turn the ignition switch to LOCK (0).
2. Disconnect the HDS from the DLC.
3. Check for continuity between test points 1 and 2.
Test condition IG LOCK (0)
Test circuit K LINE
Test point 1 DLC (16P) No. 7 (LT BLU)
Test point 2 Body ground
Fig. 9: Checking For Continuity Between Test Points 1 And 2
Courtesy of AMERICAN HONDA MOTOR CO., INC.
Is there continuity?
YES : Go to step 10.
NO : Go to step 11.
10. Shorted wire check (K LINE):
1. Continue to check for continuity between DLC terminal No. 7 and body ground, while
disconnecting these parts, one at a time:
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SRS unit connector A (39P)
VSA modulator-control unit 38P connector
TPMS control unit 20P connector
EPS control unit connector A (11P)
Immobilizer-keyless control unit 7P connector
Audio unit (audio-navigation unit) connector A (24P)
Under-dash fuse/relay box connector Q (16P)
Does continuity go away when one of the above components is disconnected?
YES : Replace the part that caused an open when it was disconnected.
NO : Repair a short in the K LINE wire between the DLC terminal No. 7 and the SRS unit,
the VSA modulator-control unit, the TPMS control unit, the EPS control unit, the
immobilizer-keyless control unit, the audio unit, the audio-navigation unit, or the driver's
under-dash fuse/relay box.
11. Open wire check (K LINE):
1. Connect terminals A and B with a jumper wire.
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Terminal A DLC (16P) No. (LT BLU)
Terminal B Body ground
Fig. 10: Checking For Continuity Between Body Ground And Connector Terminals No. 7
Courtesy of AMERICAN HONDA MOTOR CO., INC.
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2. Check for continuity between body ground and these connector terminals:
Connector
SRS unit connector A (39P)
Terminal
No. 19 (LT BLU)
VSA modulator-control unit 38P connector
TPMS control unit 20P connector
EPS control unit connector A (11P)
No. 11 (LT BLU)
No. 4 (LT BLU)
No. 5 (LT BLU)
No. 3 (LT BLU)
Immobilizer-keyless control unit 7P connector
Audio unit (audio-navigation unit) connector A (24P) No. 13 (LT BLU)
Under-dash fuse/relay box connector Q (16P) No. 14 (LT BLU)
Is there continuity between the body ground and each of the terminals in the chart?
YES : The K LINE wire is OK. Replace the control unit that does not communicate with the HDS.
NO : Repair an open in the K LINE wire between the DLC and the appropriate control unit
connector.
12. Body electrical system (B-CAN) check:
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1. DO THE GAUGE SELF-DIAGNOSTIC FUNCTION .
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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 13.
13. Open wire check (+B BACK UP line):
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1. Turn the ignition switch to LOCK (0).
2. Disconnect the HDS from the DLC.
3. Measure the voltage between test points 1 and 2.
Test condition IG LOCK (0)
Test circuit +B BACK UP
Test point 1 DLC (16P) No. 16 (WHT)
Terminal B Body ground
Fig. 11: Measuring Voltage Between Test Points 1 And 2
Courtesy of AMERICAN HONDA MOTOR CO., INC.
YES : The +B BACK UP wire is OK. Go to step 14.
NO : Repair an open in the +B BACK UP wire between DLC terminal No. 16 and the No. A29 (10
A) fuse in the under-hood fuse/relay box.
14. Open wire check (GND line):
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1. Measure the voltage between test points 1 and 2.
Test condition IG LOCK (0)
Test circuit GND, +B BACK UP
Test point 1 DLC (16P) No. 4 (BLK)
Terminal B DLC (16P) No. 16 (WHT)
Fig. 12: Measuring Voltage Between Test Points 1 And 2
Courtesy of AMERICAN HONDA MOTOR CO., INC.
Is there battery voltage?
YES : The GND wire is OK. Go to step 15.
NO : Repair an open in the GND wire between DLC terminal No. 4 and G502.
15. Open wire check (F CAN-H line):
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1. Connect the HDS to the DLC.
2. Jump the SCS line with the HDS.
3. Disconnect the following connector. PCM connector A (49P)
4. Disconnect the HDS from the DLC.
5. Check for continuity between test points 1 and 2.
Test condition IG LOCK (0)
PCM connector A (49P): disconnected
Test circuit F CAN-H
Test point 1 PCM connector A (49P) No. 3 (WHT)
Test point 2 DLC (16P) No. 6 (WHT)
Fig. 13: Checking For Continuity Between Test Points 1 And 2
Courtesy of AMERICAN HONDA MOTOR CO., INC.
Is there continuity?
YES : The F CAN-H wire is OK. Go to step 16.
NO : Repair an open in the F CAN-H wire between the PCM (A3) and DLC terminal No. 6.
16. Open wire check (F CAN-L line):
1. Check for continuity between test points 1 and 2.
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Test condition IG LOCK (0)
PCM connector A (49P): disconnected
Test circuit F CAN-L
Test point 1 PCM connector A (49P) No. 4 (RED)
Test point 2 DLC (16P) No. 14 (RED)
Fig. 14: Checking For Continuity Between Test Points 1 And 2
Courtesy of AMERICAN HONDA MOTOR CO., INC.
Is there continuity?
YES : The F CAN-L wire is OK. Update the PCM See PCM REMOVAL AND
INSTALLATION or PCM UPDATE if it does not have the latest software, or substitute a
known-good PCM See PCM REMOVAL AND INSTALLATION or PCM UPDATE, then
recheck. If the symptom/indication goes away and the PCM was updated, troubleshooting is
complete. If the symptom/indication goes away and the PCM was substituted, replace the original
PCM See PCM REMOVAL AND INSTALLATION or PCM UPDATE.
NO : Repair an open in the F CAN-L wire between the PCM (A4) and the DLC terminal No. 14.
CKP PATTERN CLEAR/CKP PATTERN LEARN PROCEDURE
PROCEDURE
1. HDS DLC - Connection
1. Connect the HDS to the data link connector (DLC) (A) located under the driver's side of the
dashboard.
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