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 | 1. Loosened Actuator fixing bolt 2. Faulty height sensor |
Detecting mode |
•
IG KEY ON, ENGINE ON, HEAD LAMP ON | |
Threshold Value |
•
Angle >± 45° | |
Detecting time |
•
1.5s ± 0.5s | |
Fail Safe |
•
Error detected during power-up : Switch to safe mode (the 85% are from IG ON)
•
Error detected during normal operation : maintain the current status |
