General Information

Adaptive Front Lighting System
B1909 Rear sensor signal fault - General Information

Component Location





General Description

AFLS (Adaptive Front-Lighting System) provides driver with the best visibility by adjusting vertical direction of the headlamp. AFLS (Adaptive Front-Lighting System) drive Leveling Actuator-Intelligent Stepper Motor for adjusting up and down, and Swivel Actuator for adjusting right and left side. It consists of AFLS ECU, Leveling Actuator-Intelligent Stepper Motor, Swivel Actuator, Head lamp switch, Height sensor (not applied to ECS). Height sensor input information of vehicle's altitude to AFLS ECU. Height sensor consists of rotor, stator, PCB coil, sensor lever. The height sensor is not-contact point type sensor use lever's movements angle that measure formed the magnetic field at around stator by rotator's revolution.

DTC Description

AFLS ECU set this code If rear height sensor signal wiring harness open or short to battery or input value is out of available range. and also incorrect information input for suspension's type can be caused B1909 thus perform the diagnostic procedure after checking suspension's type.

DTC Detecting Condition





Diagnostic Circuit Diagram