Whenever the ECU is replaced, ensure that
the communication circuit is normal.
TROUBLE JUDGMENT
The headlamp automatic levelling-ECU
receives a vehicle height signal from the front and rear height sensors
and calculates the headlamp levelling pitch angle. If an abnormal pitch
angle is calculated, diagnosis code No.24 is set.
COMMENTS ON TROUBLE SYMPTOM
The front height sensor, the
rear height sensor or the headlamp automatic levelling-ECU may be
defective.
PROBABLE CAUSES
Malfunction of the front height sensor
Malfunction of the rear height sensor
Malfunction of the headlamp automatic levelling-ECU
Damaged wiring harness and connectors
DIAGNOSIS PROCEDURE
STEP 1. Connector check: A-22 Front height sensor
connector
Q.
Is the check result normal?
Go to Step
2.
Repair the defective
connector.
STEP 2. Check the front height
sensor.
Check that the front height sensor works normally
(Refer to ).