Inspection Procedure F-6: The headlamp(s) do not illuminate.
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Whenever the ECU is replaced, ensure that the input and output signal circuits are normal.
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COMMENTS ON TROUBLE SYMPTOM
If the headlamps does not illuminate, the wiring harness connector(s), the bulb or the fuse may be defective or burned out.
PROBABLE CAUSES
- Malfunction of the headlamp bulbs
- Damaged harness wires and connectors
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STEP 1. Connector check: A-11 front combination lamp (LH) connector or A-25 front combination lamp (RH) connector
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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.
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STEP 2. Resistance measurement at the A-11 front combination lamp (LH) connector or the A-25 front combination lamp (RH) connector.
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(1)Disconnect the connector, and measure at the wiring harness side.
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(2)Check the resistance between the lamp connector and body earth.
- Resistance between A-11 front combination lamp (LH) connector terminal No.3 and body earth
- Resistance between A-25 front combination lamp (RH) connector terminal No.3 and body earth
OK: Continuity exists (2 Ω or less)
Q.
Is the check result normal?
 Go to Step 4.
 Go to Step 3.
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STEP 3. Check the wiring harness from A-11 front combination lamp (LH) connector terminal No.3 or A-25 front combination lamp (RH) connector terminal No.3 to body earth.
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- 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.
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STEP 4. Retest the system.
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(1)Replace the socket of the defective headlamp.
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(2)Check that the headlamps illuminate normally.
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Q.
Is the check result normal?
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The trouble can be an intermittent malfunction (Refer to GROUP 00 - How to use Troubleshooting/inspection Service Points - How to Cope with Intermittent Malfunction ).
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Replace the front combination lamp.
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STEP 5. Check the bulb(s) of the headlamps.
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Check the bulb(s) of the defective lamp.
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Q.
Is the check result normal?
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Go to Step 6.
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Replace the bulb(s) of the defective lamp.
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STEP 6. Connector check: B-223 headlamp relay (LO) connector
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Q.
Is the check result normal?
Go to Step 7.
Repair the defective connector.
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STEP 7. Check the wiring harness from A-11 front combination lamp (LH) connector terminal No.6 or A-25 front combination lamp (RH) connector terminal No.6 to B-223 headlamp relay (LO) connector terminal No.4.
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Prior to the wiring harness inspection, check junction block connector B-212, and repair if necessary.
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- Check the output lines for open circuit.
Q.
Is the check result normal?
Go to Step 8.
Repair the wiring harness.
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STEP 8. Retest the system.
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(1)Replace the socket of the defective headlamp.
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(2)Check that the headlamps illuminate normally.
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Q.
Is the check result normal?
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The trouble can be an intermittent malfunction (Refer to GROUP 00 - How to use Troubleshooting/inspection Service Points - How to Cope with Intermittent Malfunction ).
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Replace the front combination lamp.
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STEP 9. Check the bulb(s) of the headlamps.
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Check the bulb(s) of the defective lamp.
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Q.
Is the check result normal?
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Go to Step 10.
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Replace the bulb(s) of the defective lamp.
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STEP 10. Connector check: B-222 headlamp relay (HI) connector
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Q.
Is the check result normal?
Go to Step 11.
Repair the defective connector.
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STEP 11. Check the wiring harness from A-11 front combination lamp (LH) connector terminal No.2 or A-25 front combination lamp (RH) connector terminal No.2 to B-222 headlamp relay (HI) connector terminal No.4.
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| note |
Prior to the wiring harness inspection, check junction block connector B-212, and repair if necessary.
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- Check the output lines for open circuit.
Q.
Is the check result normal?
Go to Step 12.
Repair the wiring harness.
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STEP 12. Retest the system.
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(1)Replace the socket of the defective headlamp.
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(2)Check that the headlamps illuminate normally.
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Q.
Is the check result normal?
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The trouble can be an intermittent malfunction (Refer to GROUP 00 - How to use Troubleshooting/inspection Service Points - How to Cope with Intermittent Malfunction ).
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Replace the front combination lamp.
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