AHLS provides driver with the best visibility by adjusting vertical direction of the headlamp.To ensure an optimum operation of the system, The AHLS(Auto Head Lamp Levelling System) has to be adjusted at end-of line procedure.The mechanical basic setting of the headlamps is to be performed with ignition being switched ON. It is important to adjust the system electronically and mechanically at the same place. Only by this way it is quaranteed that the car is in the same suspension condition.
The AHLS ECU sets DTC C1620 if the headlamp leveling system has not been adjusted since installation.
Item | Detecting Condition | Possible Cause |
DTC Strategy |
•
First Setup result monitoring | 1. Faulty ACTUATOR ADJUSTING 2. Faulty AHLS ECU |
Detecting mode |
•
Engine "ON" and Head lamp "ON" | |
Threshold Value |
•
When being not aware of the origin setting code input right after downloading parameter | |
Detecting time |
•
Fault immediately | |
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 |
