Body Electrical System

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 ECM ( A/D , EEPROM, ROM, RAM ) are checked internally during every start-up sequence.

DTC Description

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

DTC Detecting Condition






Component Inspection

Check ECU(AHLS)
1. Connect scantool to Data Link Connector(DLC).
2. Engine "ON" and Head lamp"ON".
3. Erase the DTC with scantool.
4. Is it possible to erase the DTC with Scantool ?






CAUTION:
Perform Vehicle Selection and Level Initialization with scantool if AHLS ECM is replace. (Auto Levelling Sensor)






Verification of Vehicle Repair

After a repair, it is essential to verifying that the fault has been corrected.
1. Connect scan tool and select "Diagnostic Trouble Codes(DTCs)" mode.
2. Using scantool, Clear DTC.
3. Operate the vehicle within DTC Enable conditions in General information.
4. Are any DTCs present ?