DISCHARGE HEADLIGHT SYSTEM INSPECTION

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Discharge headlight inoperative

Warning
•  Incorrect servicing of the discharge headlights could result in electrical shock. Before servicing the discharge headlights, always refer to the discharge headlight service warnings. (See DISCHARGE HEADLIGHT SERVICE WARNINGS.)

Terminal layout

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Inspection procedure

STEP

INSPECTION

ACTION
1
INSPECT POWER SUPPLY CIRCUIT OF DISCHARGE HEADLIGHT CONTROL MODULE
•  Disconnect the discharge headlight control module connector.
•  Turn the light switch to the HEADLIGHT (LO) position.
•  Measure the voltage at discharge headlight control module connector (harness-side) terminal A.
•  Is the voltage approx. 12 V?
Yes
Go to Step 6.
No
Go to the next step.
2
INSPECT FUSE
•  Turn the light switch to the OFF position.
•  Remove the HEAD LOW R 15 A fuse (RH) or HEAD LOW L 15 A fuse (LH).
•  Inspect the fuses.
•  Are the fuses normal?
Yes
Go to the next step.
No
Replace the fuse.
3
INSPECT HEADLIGHT RELAY
•  Remove the headlight low relay. (See RELAY LOCATION.)
•  Inspect the headlight low relay. (See RELAY INSPECTION.)
•  Is the headlight low relay normal?
Yes
Go to the next step.
No
Replace the headlight low relay. (See RELAY LOCATION.)
4
INSPECT LIGHT SWITCH
•  Inspect the light switch. (See LIGHT SWITCH INSPECTION.)
•  Is the light switch normal?
Yes
Go to the next step.
No
Replace the light switch. (See LIGHT SWITCH REMOVAL/INSTALLATION.)
5
INSPECT WIRING HARNESS BETWEEN BATTERY AND DISCHARGE HEADLIGHT CONTROL MODULE
•  Disconnect the negative battery cable.
•  Inspect for continuity between the following terminals:
―  Positive battery—headlight low relay terminal D
―  H/L LO 15 A fuse (RH)—discharge headlight control module terminal A
―  H/L LO 15 A fuse (LH)—discharge headlight control module terminal A
•  Are the wiring harnesses normal?
Yes
Go to the next step.
No
Replace the related wiring harness.
6
INSPECT WIRING HARNESS BETWEEN DISCHARGE HEADLIGHT CONTROL MODULE AND GROUND
•  Inspect wiring harness between discharge headlight control module terminal B and ground for following:
―  Short to power supply
―  Open circuit
•  Is the wiring harness normal?
Yes
Go to the next step.
No
Replace the related wiring harness.
7
VERIFY WHETHER MALFUNCTION IS IN DISCHARGE HEADLIGHT OR DISCHARGE HEADLIGHT CONTROL MODULE
•  Install any other discharge headlight. (See HEADLIGHT BULB REMOVAL/INSTALLATION.)
•  Connect the discharge headlight control module connector.
•  Turn the headlight switch to the HEADLIGHT (LO) position.
•  Does the headlight (low-beam) illuminate?
Yes
Replace the discharge headlight. (See HEADLIGHT BULB REMOVAL/INSTALLATION.)
No
Replace the discharge headlight control module. (See DISCHARGE HEADLIGHT CONTROL MODULE REMOVAL/INSTALLATION.)