DISCHARGE HEADLIGHT SYSTEM INSPECTION

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

Terminal layout

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Inspection procedure

Step

Inspection

Action
1
INSPECT RELAY
•  Disconnect the negative battery cable.
•  Remove the following relays:
―  Headlight LO relay (LH)
―  Headlight LO relay (RH)
•  Inspect the relays.
•  Are all relays normal?
Yes
Install the relays, then go to the next step.
(See RELAY LOCATION.)
No
Replace the malfunctioning relay.
(See RELAY LOCATION.)
2
INSPECT LIGHT SWITCH
•  Inspect the light switch.
•  Is the light switch normal?
Yes
Go to the next step.
No
Replace the light switch.
(See LIGHT SWITCH REMOVAL/INSTALLATION.)
3
INSPECT DISCHARGE HEADLIGHT CONTROL MODULE CONNECTOR
•  Disconnect the discharge headlight control module connector.
•  Inspect the connector engagement and connection condition and inspect the terminals for damage, deformation, corrosion, or disconnection.
•  Is the connector normal?
Yes
Go to the next step.
No
Repair or replace the connector.
4
INSPECT FOR OPEN CIRCUIT IN DISCHARGE HEADLIGHT CONTROL MODULE GROUND CIRCUIT
•  Verify that the discharge headlight control module is disconnected.
•  Inspect for continuity between discharge headlight control module terminal C (wiring harness-side) and body ground.
•  Is there continuity?
Yes
Go to the next step.
No
Refer to the wiring diagram and verify whether or not there is a common connector between discharge headlight control module terminal C and body ground.
If there is a common connector:
•  Determine the malfunctioning part by inspecting the common connector and the terminal for corrosion, damage, or pin disconnection, and the common wiring harness for an open circuit.
•  Repair or replace the malfunctioning part.
If there is no common connector:
•  Repair or replace the wiring harness which has an open circuit.
5
INSPECT DISCHARGE HEADLIGHT CONTROL MODULE POWER SUPPLY CIRCUIT
•  Verify that the discharge headlight control module connector is disconnected.
•  Reconnect the negative battery cable.
•  Turn the light switch to the HEAD position.
•  Measure the voltage at discharge headlight control module terminal B (wiring harness-side).
•  Is the voltage B+?
Yes
Turn the light switch to the OFF position, then go to the next step.
No
Inspect the HID L 15 A fuse and HID R 15 A fuse.
•  If the fuse is burnt out:
―  Refer to the wiring diagram and verify whether or not there is a common connector between HID L 15 A fuse or HID R 15 A fuse and discharge headlight control module terminal B.
If there is a common connector:
•  Determine the malfunctioning part by inspecting the common connector and the terminal for corrosion, damage, or pin disconnection, and the common wiring harness for a short to ground.
•  Repair or replace the malfunctioning part.
If there is no common connector:
•  Repair or replace the wiring harness which has a short to ground.
•  Replace the fuse.
•  If the fuse is damaged:
―  Replace the fuse.
•  If the fuse is normal:
―  Refer to the wiring diagram and verify whether or not there is a common connector between battery positive terminal and discharge headlight control module terminal B.
If there is a common connector:
•  Determine the malfunctioning part by inspecting the common connector and the terminal for corrosion, damage, or pin disconnection, and the common wiring harness for an open circuit.
•  Repair or replace the malfunctioning part.
If there is no common connector:
•  Repair or replace the wiring harness which has an open circuit.
6
VERIFY IF MALFUNCTION CAUSE IS HEADLIGHT HI/LO BULB OR DISCHARGE HEADLIGHT CONTROL MODULE
•  Disconnect the negative battery cable.
•  Install a normal headlight HI/LO bulb.
•  Make sure to reconnect all disconnected connectors.
•  Reconnect the negative battery cable.
•  Turn the light switch to the HEAD position.
•  Do the headlights LO illuminate?
Yes
Replace the headlight HI/LO bulb.
(See HEADLIGHT BULB REMOVAL/INSTALLATION.)
No
Replace the discharge headlight control module.
(See DISCHARGE HEADLIGHT CONTROL MODULE REMOVAL/INSTALLATION.)