Inspection Procedure 4: One of the headlamps does not illuminate. <Discharge type>


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 headlamp assembly may have a problem, or the fuse may be burned out.

PROBABLE CAUSES



DIAGNOSIS PROCEDURE

STEP 1. Resistance measurement at the headlamp (LH) connector, headlamp (RH) connector.
(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 (LH) connector (earth terminal) and the body earth.
  • Measure the resistance between the headlamp (RH) connector (earth terminal) and the body earth.
OK: Continuity exists (2 Ω or less)

Q. Is the check result normal?
Go to Step 3.
Go to Step 2.

STEP 2. Check of open circuit in body earth line between headlamp (LH) connector terminal or headlamp (RH) connector terminal 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 3. Check of short to power supply, and open circuit in power supply line between headlamp (LH) connector or headlamp (RH) connector and headlamp relay (LO) or headlamp relay (HI) connector.

Q. Is the check result normal?
Go to Step 4.
Repair the connector(s) or wiring harness.

STEP 4. Retest the system.
Check that the headlamps illuminate normally.

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).
Replace the headlamp assembly.