AHLS provides driver with the best visibility by adjusting vertical direction of the headlamp. It consists of AHLS ECU, Linkage and Headlamp actuator. AHLS ECU is composed of many IC components, such as A/D(AD converter), EEPROM, ROM, RAM and others.It also contains several different parameter-sets which defines the behavior in different car types and respect different mounting places. For efficient operation of system, The internal components of AHLS ECU(A/D, EEPROM, ROM, RAM) are checked internally during every start-up sequence.
The AHLS ECU sets DTC C1604 if one of component self-test result is negative.
Item | Detecting Condition | Possible Cause |
DTC Strategy |
•
ECM internal component monitoring. | 1. Faulty AHLS ECU |
Detecting mode |
•
Engine "ON" and Head lamp "ON" | |
Threshold Value |
•
ECU Hardware error (A/D converter Fail)
•
ECU Software error (EEPROM/ROM Fail) | |
Detecting time |
•
Fault immediately | |
Fail Safe |
•
Inability to operation system |
