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.)
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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 HEAD (LO) position.
•  Measure the voltage at discharge headlight control module terminal A (wiring harness-side).
•  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 H/L LOW R 15 A fuse or H/L LOW L 15 A fuse.
•  Inspect the fuses.
•  Are the fuses normal?
Yes
Go to the next step.
No
Replace the fuse.
3
INSPECT H/L LOW RELAY
•  Inspect the headlight relay (LO). (See RELAY INSPECTION.)
•  Is the headlight relay (LO) normal?
Yes
Go to the next step.
No
Replace the headlight relay (LO). (See RELAY INSPECTION.)
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:
―  Battery (positive terminal) and headlight relay (LO) terminal E.
―  H/L LOW R 15 A fuse and discharge headlight control module terminal A
―  H/L LOW L 15 A fuse and 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 the wiring harness between discharge headlight control module terminal B and ground for the 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 BULB OR DISCHARGE HEADLIGHT CONTROL MODULE
•  Install the discharge headlight bulb (previously verified as illuminating normally). (See HEADLIGHT BULB REMOVAL/INSTALLATION.)
•  Connect the discharge headlight control module connector.
•  Turn the light switch to the HEAD (LO) position.
•  Does the headlight (low-beam) illuminate?
Yes
Replace the discharge headlight bulb.
(See HEADLIGHT BULB REMOVAL/INSTALLATION.)
No
Replace the discharge headlight control module.
(See DISCHARGE HEADLIGHT CONTROL MODULE REMOVAL/INSTALLATION.)