Left High Beam Headlamp Inoperative

LEFT HIGH BEAM HEADLAMP INOPERATIVE

Left High Beam Headlamp Inoperative:

POSSIBLE CAUSES
- Fused B(+) circuit open
- Ground circuit open
- Left high beam headlamp bulb

DIAGNOSTIC TEST

1. INSPECT THE LEFT HIGH BEAM HEADLAMP BULB

NOTE: Inspect Fuse 5 located in the Illumination Control Module/IP Fuse Block. If the fuse is open, repair the cause of the open fuse before continuing.

Turn the ignition off.
Remove the Left High Beam Headlamp bulb and inspect for an open filament.

Q: Is the Bulb filament open?

YES: Replace the Left High Beam Headlamp bulb. Perform BODY VERIFICATION TEST. Body Verification Test
NO: Go to 2

2. MEASURE FUSED B(+) CIRCUIT RESISTANCE




Disconnect the Left Front Lamp Assembly harness connector.
Disconnect the Illumination Control Module harness connector.

NOTE: Check connectors - Clean/repair as necessary.

Measure the resistance between the Left Front Lamp Assembly harness connector cavity 4 and the Illumination Control Module harness connector.

Q: Is the resistance below 5.0 ohms?

YES: Go to 3
NO: Repair the Fused B(+) circuit for an open between the Left Front Lamp Assembly and the Illumination Control Module. Perform BODY VERIFICATION TEST. Body Verification Test

3. MEASURE LEFT HIGH BEAM HEADLAMP VOLTAGE




Connect the Illumination Control Module harness connector.
Turn the ignition on.
Turn the high beam headlamps on.
Measure the voltage between the Left Front Lamp Assembly harness connector cavity 4 and ground.

Q: Is the voltage above 10 volts?

YES: Go to 4
NO: Replace the Illumination Control Module. Perform BODY VERIFICATION TEST. Body Verification Test

4. MEASURE LEFT HIGH BEAM HEADLAMP GROUND CIRCUIT RESISTANCE




Turn the ignition off.
Turn the high beam headlamps off.
Measure the resistance between the Left Front Lamp Assembly harness connector cavity 2 and ground.

Q: Is the resistance below 5.0 ohms?

YES: Ensure that the Left High Beam Headlamp bulb is installed properly and replace the bulb socket if necessary. Perform BODY VERIFICATION TEST. Body Verification Test
NO: Repair the Left Front Lamp Assembly ground circuit for an open. Perform BODY VERIFICATION TEST. Body Verification Test