Component Location
General Description

AHLS provides driver with the best visibility by adjusting vertical direction of the headlamp. It consists of ECM, Linkage and actuator. The ECM detects the vehicle speed to use it a compensation factor for the actuator control. In other words, when the vehicle speed is low the acutator needs to repond slowly though the linkage of height sensor moves quickly ( reponse filter value is high ) .But when the vehicle speed is high, ECM operates the actuator quickly in proportion to the height sensor variation.

DTC Description

The ECM sets DTC C1212 if the speed signal line carries a higher frequency than defined maximum value( approx. 300Hz) for 2 seconds

DTC Detecting Condition

Item

Detecting Condition

Possible Cause

DTC Strategy

● Frequency check

● Poor connection

● Vehicle speed sensor

Detecting mode

● every 20ms

Threshold value

● Frequency >300Hz

Detecting time

● 2 Sec

Signal Waveform
Schematic Diagram
Яндекс.Метрика