Inspection Procedure 1: The both headlamp automatic levelling systems (right and left) do not work normally.



caution
  • Before replacing the ECU, ensure that the power supply circuit, the earth circuit and the communication circuit are normal.
  • When the ETACS-ECU of vehicles without KOS is replaced, the encrypted code of the ignition key needs to be registered to the ETACS-ECU. (If the encrypted code is not registered, the engine cannot be started. Register the encrypted code as described in Immobilizer System - How to Register Key ID .)

COMMENTS ON TROUBLE SYMPTOM


If the both headlamp automatic levelling systems (right and left) do not work normally, ETACS-ECU initialization, each height sensor or ETACS-ECU may be defective.

PROBABLE CAUSES




DIAGNOSIS PROCEDURE


STEP 1. M.U.T.-III CAN bus diagnostics


Use the M.U.T.-III to diagnose the CAN bus lines.

Q. Is the check result normal?

Go to Step 2.

Repair the CAN bus line (Refer to GROUP 54C - Troubleshooting ).

STEP 2. M.U.T.-III other system diagnosis code


Check if diagnosis code is set to the engine-ECU.

Q. Is the diagnosis code set?

Troubleshoot the engine (Refer to GROUP 13A - Diagnosis Code Chart .)

Go to Step 3.

STEP 3. M.U.T.-III diagnosis code


Check if diagnosis code No. B2513 is set.

Q. Is the diagnosis code set?

Perform the troubleshooting of the diagnosis code No. B2513.

Go to Step 4.

STEP 4. Height sensor installation status check


Check that the front and rear height sensor is installed properly.

Q. Is the check result normal?

Go to Step 5.

Install the height sensor properly.

STEP 5. Retest the system


After the ETCAS-ECU initialization (refer to ), check that the headlamp automatic levelling system operates normally.

Q. Is the check result normal?

This diagnosis is complete.

Go to Step 6.

STEP 6. Front height sensor check


Check the front height sensor with the rear height sensor removed.
(1)Disconnect the rear height sensor connector.
(2)Check that the front height sensor is normal (Refer to ).

Q. Is the check result normal?

Go to Step 7.

Replace the front height sensor.

STEP 7. Rear height sensor check


Check that the rear height sensor is normal (Refer to ).

Q. Is the check result normal?

Go to Step 8.

Replace the rear height sensor.

STEP 8. Retest the system


Check that the automatic levelling operates 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 ETACS-ECU.