ON-BOARD DIAGNOSTIC [MULTIPLEX COMMUNICATION SYSTEM],
ON-BOARD DIAGNOSTIC [DISCHARGE HEADLIGHT]
T–146
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FOREWORD
A6E818867000W01
Outline
• The OBD (on-board diagnostic) test inspects the integrity and function of the discharge headlight and output
the results when requested by the specific tests.
• OBD test also:
— Provides a quick inspection of the discharge headlight.
— Is usually performed at the start of each diagnostic procedure.
— Provides verification after repairs to ensure that no other faults occurred during service.
• Diagnostic DTC can be read/cleared, using the SST (WDS or equivalent)
Read/clear diagnostic results
• This function allows you to read or clear DTCs in the discharge headlight control unit (LH) memory.
Reading DTCs Procedure Using WDS or equivalent
1. Connect SST (WDS or equivalent) to the vehicle
DLC-2 16-pin connector.
2. Turn the ignition switch to ON (Engine OFF) or
start engine.
3. Retrieve DTC by SST (WDS or equivalent).
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14 INSPECT WIRING HARNESS BETWEEN PCM
AND DSC HU/CM
• Disconnect negative battery cable.
• Disconnect DSC HU/CM connector.
• Inspect following wiring harness between
PCM and DSC HU/CM terminals for short to
ground, short power supply, and open circuit:
— 2R—AF (CAN_L)
— 2U—AG (CAN_H)
• Is wiring harness okay?
Yes Replace PCM, then go to Step 16.
No Replace wiring harness.
15 INSPECT WIRING HARNESS BETWEEN PCM
AND ABS (ABS/TCS) HU/CM
• Disconnect negative battery cable.
• Disconnect ABS (ABS/TCS) HU/CM
connector.
• Inspect following wiring harness between
PCM and ABS (ABS/TCS) HU/CM terminals
for short to ground, short power supply, and
open circuit:
— 2R—R (CAN_L)
— 2U—O (CAN_H)
• Is wiring harness okay?
Yes Replace PCM, then go to next step.
No Replace wiring harness.
16 CHECK DTC INDICATE
• Connect PCM connector.
• Connect ABS (ABS/TCS) HU/CM or DSC
HU/CM connector.
• Connect instrument cluster connector.
• Clear DTC from module memory using SST
(WDS or equivalent).
• Perform KOEO/KOER self-test.
• Are DTCs U0073, U1900 and/or U2516
indicated?
Yes Repeat from Step 1.
No Troubleshooting completed.
STEP INSPECTION ACTION
ON-BOARD DIAGNOSTIC [DISCHARGE HEADLIGHT]
DLC-2
A6E3970W002
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