General Information

Auto Headlamp Leveling
C1604 ECU Fault - General Information

Component Location





General Description

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.

DTC Description

The AHLS ECU sets DTC C1604 if one of component self-test result is negative.

DTC Detecting Condition





Diagnostic Circuit Diagram