If there is any problem in the CAN bus lines, an incorrect diagnosis code may be set. Prior to this diagnosis, always diagnose the CAN bus lines.
Before replacing the ECU, ensure that the power supply circuit, the earth circuit and the communication circuit are normal.
DIAGNOSTIC FUNCTION
When the headlamp automatic levelling system initialization * is not implemented, the headlamp automatic levelling system warning is displayed on the multi information display and the code No. B2510 is stored. When the headlamp automatic levelling system initialization is completed, the code No. B2510 is cleared automatically.
note
*: When the height sensor related diagnosis code (B2514, B2515 or B2516) or headlamp automatic levelling-ECU related diagnosis code (B2511 or B2512) is set, initialization of the headlamp automatic levelling system is impossible, therefore perform the troubleshooting for the diagnosis code that has been set previously.
JUDGEMENT CRITERIA
Initialization of the headlamp automatic levelling system is not completed.
PROBABLE CAUSES
Headlamp automatic levelling system initialization not completed
Malfunction of the headlamp automatic levelling-ECU
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 diagnosis code
Check if the height sensor related diagnosis code (B2514, B2515 or B2516) or the headlamp automatic levelling-ECU related diagnosis code (B2511 or B2512) is set.
Q.
Is the diagnosis code set?
Perform the troubleshooting of the diagnosis code that has been set previously.
Go to Step 3.
STEP 3. Check whether the diagnosis code is reset.
Initialize the headlamp automatic levelling system and check the diagnosis code of the headlamp automatic levelling-ECU.
(1)Initialize the headlamp automatic levelling system. Refer to .
(2)Turn the ignition switch from "LOCK" (OFF) position to "ON" position.
(3)Check if diagnosis code is set.
Q.
Is the diagnosis code set?
Replace the headlamp automatic levelling-ECU.
The trouble can be an intermittent malfunction (Refer to GROUP 00 - How to use Troubleshooting/inspection Service Points - How to Cope with Intermittent Malfunction ).
Repair the CAN bus line (Refer to GROUP 54C - Troubleshooting 
).