Inspection Procedure 3

Inspection Procedure 3: Either automatic leveling does not operate.

CAUTION: Before replacing the ECU, ensure that the power supply circuit, the ground circuit and the communication circuit are normal.

Headlight Leveling Unit Circuit Part 1:

Headlight Leveling Unit Circuit Part 2:

TECHNICAL DESCRIPTION (COMMENT)
If either automatic leveling does not operate, the wiring harness and connector(s) between the headlight automatic leveling-ECU and the headlight leveling unit, or the headlight assembly (headlight leveling unit) may have a problem.

TROUBLESHOOTING HINTS
- Malfunction of headlight assembly (headlight leveling unit)
- The wiring harness or connectors may have loose, corroded,or damaged terminals, or terminals pushed back in the connector

DIAGNOSIS

STEP 1. Check headlight leveling unit.

Perform a leveling motor drive test of the headlight leveling unit to check that the motor is driven.

Q: Do Headlight leveling unit work normal?

YES: The trouble can be an intermittent malfunction (Refer to How to use Troubleshooting/ inspection Service Points - How to Cope with Intermittent Malfunction).

NO (The left leveling motor is not driven.): Go to Step 2.

NO (The right leveling motor is not driven.): Go to Step 5.

STEP 2. Check headlight automatic leveling-ECU connector C-110, Headlight leveling unit (LH) connector A-37 for loose, corroded or damaged terminals, or terminals pushed back in the connector.

Q: Is headlight automatic leveling-ECU connector C-110, Headlight leveling unit (LH) connector A-37 in good condition?

YES: Go to Step 3.

NO: Repair the damaged parts.

STEP 3. Check wiring harness between headlight automatic leveling-ECU connector C-110 (terminal No. 2/3/4) and headlight leveling-unit (LH) connector A-37 (terminal No. 11/10/12).

Q: Is headlight automatic leveling-ECU connector C-110 (terminal No. 2/3/4) and headlight leveling-unit (LH) connector A-37 (terminal No. 11/10/12) in good condition?

YES: Go to Step 4.

NO: Repair the wiring harness.

STEP 4. Retest the system.

Check that the automatic leveling of the left headlight operates normally.

Q: Is the check result normal?

YES: The trouble can be an intermittent malfunction (Refer to How to use Troubleshooting/ inspection Service Points - How to Cope with Intermittent Malfunction).

NO: Replace the headlight assembly (LH).

STEP 5. Check headlight automatic leveling-ECU connector C-110,Headlight leveling unit (RH) connector A-56 for loose, corroded or damaged terminals, or terminals pushed back in the connector.

Q: Is headlight automatic leveling-ECU connector C-110,Headlight leveling unit (RH) connector A-56 in good condition?

YES: Go to Step 6.

NO: Repair the damaged parts.

STEP 6. Check wiring harness between headlight automatic leveling-ECU connector C-110 (terminal No. 11/12/13) and headlight leveling-unit (LH) connector A-37 (terminal No. 11/10/12).

Q: Is headlight automatic leveling-ECU connector C-110 (terminal No. 11/12/13) and headlight leveling-unit (LH) connector A-37 (terminal No. 11/10/12) in good condition?

YES: Go to Step 7.

NO: Repair the wiring harness.

STEP 7. Retest the system.

Check that the automatic leveling of the right headlight operates normally.

Q: Is the check result normal?

YES: The trouble can be an intermittent malfunction (Refer to How to use Troubleshooting/ inspection Service Points - How to Cope with Intermittent Malfunction).

NO: Replace headlight assembly (RH)