Inspection Procedure 5: Any of 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




PROBABLE CAUSES



  • Malfunction of the headlamp bulbs
  • Malfunction of the headlamp assembly
  • Damaged harness wires and connectors

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?





STEP 2. Bulb check



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?





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?





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



  • Check the earth wires for open circuit.

Q. Is the check result normal?





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



  • Check the power supply line for open circuit.

Q. Is the check result normal?