DISCHARGE HEADLIGHT SYSTEM INSPECTION


BHE091851030W04

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

Inspection procedure

STEP

INSPECTION

ACTION

1

INSPECT POWER SUPPLY CIRCUIT OF DISCHARGE HEADLIGHT CONTROL UNIT

• Disconnect the discharge headlight control unit connector.
• Turn the headlight switch to the HEADLIGHT (LO) position.
• Measure the voltage at discharge headlight control unit connector (harness-side) terminal C.
• Is the voltage approx. 12 V?
Yes
Go to Step 6.
No
Go to the next step.
2

INSPECT FUSE

• Turn the headlight 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 relay. (See RELAY LOCATION.)
• Inspect the headlight relay. (See RELAY INSPECTION.)
• Is the headlight relay normal?
Yes
Go to the next step.
No
Replace the headlight 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 UNIT

• Disconnect the negative battery cable.
• Inspect for continuity between the following terminals:
– Battery (positive terminal) and headlight relay (main fuse block terminal A)
– Headlight relay terminal 3A and HEAD LOW R 15 A fuse (RH) terminal G
– Headlight relay terminal 3A and HEAD LOW L 15 A fuse (LH) terminal G
– HEAD LOW R 15 A fuse (RH) terminal H and discharge headlight control unit terminal C
– HEAD LOW L 15 A fuse (LH) terminal F and discharge headlight control unit terminal C
• 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 UNIT AND GROUND

• Inspect wiring harness between discharge headlight control unit terminal D and ground for following:
– Short to power supply
– Open circuit
• Inspect the headlight relay. (See RELAY INSPECTION.)
• 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 UNIT

• Install any other discharge headlight bulb (low-beam). (See HEADLIGHT BULB REMOVAL/INSTALLATION.)
• Connect the discharge headlight control unit connector.
• Turn the headlight switch to the HEADLIGHT (LO) position.
• Does the headlight (low-beam) illuminate?
Yes
System inspection completed.
No
Replace the discharge headlight control unit.