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




PROBABLE CAUSES



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

DIAGNOSIS PROCEDURE


STEP 1. Bulb check



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?





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?





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?





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?