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 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 LO RH 15 A fuse or H/L LO LH 15 A fuse.
•  Inspect the fuses.
•  Are the fuses normal?
Yes
Go to the next step.
No
Replace the fuse.
3
INSPECT HEADLIGHT RELAY
•  Inspect the headlight relay. (See RELAY INSPECTION.)
•  Is the headlight relay normal?
Yes
Go to the next step.
No
Replace the headlight relay.
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 terminal C.
―  H/L LO RH 15 A fuse and discharge headlight control module terminal A
―  H/L LO LH 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 low bulb (previously verified as illuminating normally). (See HEADLIGHT BULB REMOVAL/INSTALLATION.)
•  Connect the discharge headlight control module connector.
•  Turn the light switch to the HEADLIGHT (LO) position.
•  Does the headlight (low-beam) illuminate?
Yes
System inspection completed.
No
Replace the discharge headlight control module. (See DISCHARGE HEADLIGHT CONTROL MODULE REMOVAL/INSTALLATION.)