LIN (Local Interconnect Network) is direct communication system to low-cost for electric system of vehicle. AFLS ECU controls the position of headlamp by using LIN which calculates input signals of height sensor, vehicle speed and steering wheel position.
Swivel Actuator controls left / right position of Headlamp.
ISM(Intelligent Stepper Motor) controls up/down position of headlamp.
If this LIN communication error of left Swivel Actuator occurs, this B1639 code is set. And that AFLS warning lamp is turned on in the cluster.
Item | Detecting Condition | Possible Cause |
DTC Strategy |
•
Signal monitoring | 1. LIN Communication circuit is opened/shorted 2. Left Swivel Motor connection is opened 3. Faulty ISM of left side headlamp |
Enable Conditions |
•
IG ON | |
Threshold Value |
•
Left Swivel Actuator LIN communication error | |
Detecting time |
•
1 sec. | |
Fail Safe |
•
Swivelling : stop at present status
•
Levelling : stop at present status | |
Check Lamp |
•
AFLS warning lamp on |
Fig.1) LIN communication Signal Waveform
