Inspection Procedure 5: One of the headlamps does not illuminate. <2-bulb type>

COMMENTS ON TROUBLE SYMPTOM



PROBABLE CAUSES



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

DIAGNOSIS PROCEDURE

STEP 1. Connector check: A-116 headlamp (LH) connector or A-126 headlamp (RH) connector


Q. Is the check result normal?

YES <Either of LH side and RH side does not illuminate> : Go to Step 2.

YES <Low-beam of LH side or RH side does not illuminate> : Go to Step 5.

YES <High-beam of LH side or RH side does not illuminate> : Go to Step 9.

NO <The connectors are not in good condition> : Repair the defective connector.

STEP 2. Resistance measurement at the A-116 headlamp (LH) connector or the A-126 headlamp (RH) connector.


(1)Disconnect the connector, and measure at the wiring harness side.

(2)Check the resistance between the lamp connector and body earth.

  • Resistance between A-116 headlamp (LH) connector terminal No.2 and body earth
  • Resistance between A-126 headlamp (RH) connector terminal No.2 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 the wiring harness from A-116 headlamp (LH) connector terminal No.2 or A-126 headlamp (RH) connector terminal No.2 to body earth.



  • Check the earth wires for open circuit.

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 4. Retest the system.
(1)Replace the socket of the defective headlamp.
(2)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.

STEP 5. Check the bulb(s) of the headlamps.
Check the bulb(s) of the defective lamp.

Q. Is the check result normal?
Go to Step 6.
Replace the bulb(s) of the defective lamp.

STEP 6. Connector check: A-22X headlamp relay (LO) connector

Q. Is the check result normal?

Go to Step 7.

Repair the defective connector.

STEP 7. Check the wiring harness from A-116 headlamp (LH) connector terminal No.1 or A-126 headlamp (RH) connector terminal No.1 to A-22X headlamp relay (LO) connector terminal No.3.




  • Check the output lines for open circuit.

Q. Is the check result normal?

Go to Step 8.

Repair the wiring harness.

STEP 8. Retest the system.
(1)Replace the socket of the defective headlamp.
(2)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.

STEP 9. Check the bulb(s) of the headlamps.
Check the bulb(s) of the defective lamp.

Q. Is the check result normal?
Go to Step 10.
Replace the bulb(s) of the defective lamp.

STEP 10. Connector check: A-23X headlamp relay (HI) connector

Q. Is the check result normal?

Go to Step 11.

Repair the defective connector.

STEP 11. Check the wiring harness from A-116 headlamp (LH) connector terminal No.3 or A-126 headlamp (RH) connector terminal No.3 to A-23X headlamp relay (HI) connector terminal No.3.




  • Check the output lines for open circuit.

Q. Is the check result normal?

Go to Step 12.

Repair the wiring harness.

STEP 12. Retest the system.
(1)Replace the socket of the defective headlamp.
(2)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.