Inspection Procedure 16: One of the Bending Lamps does not Illuminate.
| caution | Before replacing the ECU, ensure that the power supply circuit, the earth circuit and the communication circuit are normal. |
COMMENTS ON TROUBLE SYMPTOM
PROBABLE CAUSES
- Malfunction of the bending lamp bulbs
- Malfunction of the AFS-ECU
- Damaged harness wires and connectors
DIAGNOSIS PROCEDURE
STEP 1. Connector check: A-35 (LH), A-53 (RH) headlamp assembly connector and A-28X headlamp relay (LO) connector
Q.
Is the check result normal?
STEP 2. Bulb check
Q.
Is the check result normal?
STEP 3. Voltage measurement at the A-35 (LH) or A-53 (RH) headlamp assembly connector
| (1)Remove the headlamp assembly (LH) or (RH), and measure at the relay box side. |
| (2)Illuminate the headlamps. |
| (3)Measure the voltage between A-35 headlamp assembly (LH) connector terminal No. 7 and the body earth. OK: System voltage |
| (4)Measure the voltage between A-53 headlamp assembly (RH) connector terminal No. 7 and the body earth. OK: System voltage |
Q.
Is the check result normal?
STEP 4. Wiring harnesses check between A-35 (LH) or A-53 (RH) headlamp assembly connector terminal No. 7 and the A-28X headlamp relay (LO) connector terminal No. 3
- Check the power supply line for open circuit and short circuit.
Q.
Is the check result normal?
STEP 5. Connector check: C-12 AFS-ECU connector
Q.
Is the check result normal?
STEP 6. Wiring harnesses check between A-35 (LH) or A-53 (RH) headlamp assembly connector terminal No. 8 and the C-12 AFS-ECU connector terminal No. 4 (LH) or 3 (RH)
Q.
Is the check result normal?
STEP 7. Retest the system
Q.
Is the check result normal?