Inspection Procedure 3: One of the Automatic Levellings does not Work.



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 headlamp assembly (headlamp levelling unit)
  • Damaged harness wires and connectors

DIAGNOSIS PROCEDURE


STEP 1. Headlamp levelling unit check



Q. Is the check result normal?







STEP 2. Connector check: C-14 Headlamp automatic levelling-ECU connector, A-36 Headlamp levelling unit (LH) connector


Q. Is the check result normal?





STEP 3. Wiring harness check between the C-14 headlamp automatic levelling-ECU connector terminal No. 2/3/4 and the A-36 headlamp levelling unit (LH) connector terminal No. 2/6/3



  • Check the power supply lines, earth lines and communication lines for open circuit or short circuit.

Q. Is the check result normal?


    Go to Step 4.



STEP 4. Retest the system



Q. Is the check result normal?





STEP 5. Connector check: C-14 Headlamp automatic levelling-ECU connector, A-52 Headlamp levelling unit (RH) connector


Q. Is the check result normal?





STEP 6. Wiring harness check between the C-14 headlamp automatic levelling-ECU connector terminal No. 11/12/13 and the A-52 headlamp levelling unit (RH) connector terminal No. 2/6/3



  • Check the power supply lines, earth lines and communication lines for open circuit or short circuit.

Q. Is the check result normal?


    Go to Step 7.



STEP 7. Retest the system



Q. Is the check result normal?