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
Malfunction of ETACS-ECU initialization
Malfunction of headlamp assembly (headlamp levelling unit)
Malfunction of front height sensor
Malfunction of rear height sensor
Malfunction of ETACS-ECU
Malfunction of CAN bus line
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 ).