AHLS provides driver with the best visibility by adjusting vertical direction of the headlamp. It consists of AHLS ECU, Linkage and actuator. The height sensor measures the angular displacement of lever by measuring the magnetic field of stator parts formed by rotation of rotor.
The AHLS ECU sets DTC C1255 if the useable range of ±45° is overridden caused by separation of actuator clamping bolt or lifting of vehicle.
Item
Detecting Condition
Possible Cause
DTC Strategy
Leveling road angle check(20ms)
Loosened Actuator fixing bolt
Faulty height sensor
Enable Conditions
IG KEY ON, ENGINE ON, HEAD LAMP ON
Threshold Value
Angle >±45°
Detecting time
More than 1.5s±0.5s