Inspection Procedure 5: One of the headlamp(s) does not illuminate.


caution If the discharge type headlamps do not illuminate, fully understand the precautions in "Service precautions for discharge headlamp" before proceeding with the troubleshooting. Refer to .

COMMENTS ON TROUBLE SYMPTOM


When one of the headlamps does not illuminate, the wiring harness, connector(s), or the bulb may have a problem, or the fuse may be burned out.

PROBABLE CAUSES



DIAGNOSIS PROCEDURE


STEP 1. Bulb check


Check the bulb(s) of headlamp that does not illuminate.
note If discharge-type low-beam headlamps do not illuminate, their bulbs cannot be inspected. In this case, assume the bulbs to be normal and proceed with steps.

Q. Is the check result normal?

Go to Step 2.

Replace the bulb(s) of the lamp that does not illuminate.

STEP 2. Resistance measurement at the headlamp assembly (LH) or (RH) connector (earth terminals).


(1)Disconnect the connector, and measure at the wiring harness side.
(2)Measure the resistance between the connector of lamp which does not illuminate and the body earth.

  • Measure the resistance between the headlamp assembly (LH) or (RH) connector (earth terminals) and body earth.
OK: Continuity exists (2 Ω or less)

Q. Is the check result normal?

Go to Step 4.

Go to Step 3.

STEP 3. Check of open circuit in earth lines between the headlamp assembly (LH) or (RH) connector and body earth.


Q. Is the check result normal?

The trouble can be an intermittent malfunction (Refer to GROUP 00 - How to use Troubleshooting/inspection Service Points - How to Cope with Intermittent Malfunction ).

Repair the connector(s) or wiring harness.

STEP 4. Check of open circuit in power supply lines between the headlamp assembly (LH) or (RH) connector and headlamp relay (LO) or (HI) connector.


Q. Is the check result normal?

Replace the headlamp assembly that does not illuminate.

Repair the connector(s) or wiring harness.