AHLS provides driver with the best visibility by adjusting vertical direction of the headlamp. It consists of AHLS ECU, Linkage and actuator. AHLS ECU detects the signal of headlamp switch which is operated by multi-function switch to diagnose the Headlamp light singal line.
AHLS ECM sets DTC C1522 if AHLS ECU detects HEAD Lamp signal circuit is open.
Item | Detecting Condition | Possible Cause |
DTC Strategy |
•
Voltage check | 1. Poor connection 2. Open circuit in Head Lamp switch signal. 3. Faulty AHLS ECU |
Detecting mode |
•
IG KEY ON, ENGINE ON, HEAD LAMP ON. | |
Threshold Value |
•
2V < Signal Voltage＜ 6V | |
Detecting time |
•
1.5s±0.5s | |
Fail Safe |
•
Retry IG1 status, it sets the lower level of safe position than actuator starting point. (output : approx. 66.7%)
•
In case of driving, it fixes current position. |
