E60, E61, E63, E64, E65, E66, E90 - Ride-Height Sensors

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NOTE: This enclosure describes the ride-height sensors on the E60, E61, E63, E64, E65, E66. The contents are valid accordingly for the ride-height sensors on the E90. Differences are described in the relevant section.

The ride-height sensors on the front and rear axles supply the signals for the automatic headlight-range adjustment. The automatic headlight-range adjustment adjusts the vertical setting of the headlights in order to compensate for variations in the vehicle tilt angle, e.g. due to payload, braking or acceleration in dynamic driving situations). The illustration shows the ride-height sensors on the E60, E61, E65, E66 up to 03/2005. See Fig 1 .

Fig 1: Ride-Height Sensor Circuit Diagram (E60, E61, E65, E66 Up To 03/2005)

Courtesy of BMW OF NORTH AMERICA, INC.

The AHL control unit controls the automatic headlight-range adjustment as follows:

The AHL control unit evaluates the signals from the ride-height sensors. The ride-height sensors are connected by a direct wire to the AHL control unit. The signals from the ride-height sensors are not sent via the K-CAN data bus.

The AHL control unit transmits the nominal values for the stepper motors to the stepper motor controllers (SMC) via the LIN bus. The stepper motor controllers actuate the stepper motors for the automatic headlight-range adjustment.

Fig 2: Ride-Height Sensor Circuit Diagram (E60, E61, E63, E64, E65, E66 From 03/2005)

Courtesy of BMW OF NORTH AMERICA, INC.

The illustration shows the ride-height sensors on the E60, E61, E63, E64, E65, E66 from 03/2005. See Fig 2 .

The ride-height sensors are directly connected to the light module (LM).

The LM actuates the stepper motor controllers (SMC) via the LIN bus.

The light module is connected to the K-CAN and the PT-CAN.

Fig 3: Ride-Height Sensors Circuit Diagram (E90)

Courtesy of BMW OF NORTH AMERICA, INC.

The illustration shows the ride-height sensors on the E90. See Fig 3 .

The ride-height sensors are directly connected to the footwell module (FRM).

The footwell module actuates the stepper motor controllers (SMC) via the LIN bus.

The footwell module is connected to the K-CAN and the PT-CAN.