Automatic Headlamp Leveling Land Rover Range Rover III

General

Automatic headlamp levelling is only fitted to vehicles with bi-xenon headlamps. The system adjusts the vertical positioning of the headlamps to provide optimum headlamp beam position for maximum driving visibility and preventing glare to oncoming drivers.

The system is controlled by the headlamp levelling ECU, which is located at the base of the LH 'A' post. The ECU receives information from the front and rear height sensors and the ABS ECU to maintain the headlamps in the optimum vertical position.

For more information on automatic headlamp levelling, refer to LIGHTING .

Power Distribution

Feed from the positive battery terminal (C0192) is supplied to fusible link 4 and fuse 53 of the passenger compartment fuse box (C0632) on an R wire. Fusible link 4 (C0590) provides a constant battery feed to the Light Check Module (LCM) (C2039) on an R wire.

Fuse 53 (C0583) provides a constant battery feed to the ignition switch (C0099 on Td6 vehicles, C0028 on V8 vehicles) on an R wire. When the ignition switch is turned to the 'auxiliary' position, current flows across the switch (C0099 on Td6 vehicles, C0028 on V8 vehicles) to fuse 9 of the passenger compartment fuse box (C0585) on a PB wire. Fuse 9 (C0587) provides an auxiliary ignition feed to the LCM (C2040) on a PY wire.

Light Check Module

When the engine is running, the Light Check Module (LCM) (C2040) provides a feed to the headlamp levelling ECU (C1543) on a YR wire to initiate the automatic headlamp levelling function.

The LCM (C2040) also monitors the condition of the brake pedal switch (C0075) by providing a feed on a UR wire. This feed allows the headlamp levelling ECU to register when the vehicle is about to decelerate and adjust the vertical position of the headlamps accordingly.

For more information on the brake pedal switch, refer to 86.40.90 BULB -- REVERSE LAMP .

See also:
• LIGHTING
• 86.40.90 BULB -- REVERSE LAMP