Inspection Procedure 5: The Headlamp(s) do 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


If any 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. Connector check: A-54 <LO (RH)>, A-37 <LO (LH)> headlamp assembly connector, A-55 <HI (RH)>, A-38 <HI (LH)> headlamp (HI) connector


Q. Is the check result normal?

Go to Step 2.

Repair the defective connector.

STEP 2. Bulb check


Check the bulb(s) of headlamp that does not illuminate.
note If discharge-type lower 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 3.

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

STEP 3. Resistance measurement at the A-54 <LO (RH)>, A-37 <LO (LH)> headlamp assembly connector or A-55 <HI (RH)>, A-38 <HI (LH)> headlamp (HI) 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 A-37 (LH), A-54 (RH) headlamp assembly connector terminal No. 8 and the body earth. <Halogen headlamp LO>
  • Measure the resistance between the A-37 (LH), A-54 (RH) headlamp assembly connector terminal No. 9 and the body earth. <Discharge headlamp LO>
  • Measure the resistance between the A-38 (LH), A-55 (RH) headlamp assembly connector terminal No. 2 and the body earth. <HI>
OK: Continuity exists (2 Ω or less)

Q. Is the check result normal?

Go to Step 5.

Go to Step 4.

STEP 4. Wiring harnesses check between the A-54 <LO (RH)>, A-37 <LO (LH)> headlamp assembly connector terminal No. 8 <Halogen headlamp> / terminal No. 9 <Discharge headlamp>, or A-55 <HI (RH)>, A-38 <HI (LH)> headlamp connector terminal No. 2 and the 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 wiring harness.

STEP 5. Wiring harnesses check between A-54 <LO (RH)>, A-37 <LO (LH)> headlamp assembly connector terminal No. 2 <Halogen headlamp> / terminal No. 3 <Discharge headlamp>, or A-55 <HI (RH)>, A-38 <HI (LH)> headlamp connector terminal No. 1 and the A-28X <LO> or A-20X <HI> headlamp relay connector terminal No. 3



Q. Is the check result normal?

Replace the headlamp assembly that does not illuminate.

Repair the wiring harness.