BMW 740iL Reparaturanleitung PDF herunterladen (Seite 17)

Level Control Systems

Air Springs

The air spring is made from a flexible rubber material. It

forms an air tight cavity which provides the calculated

spring rate required for the sport wagon.

As the spring compresses downward the bottom edge

of the rubber material rolls along the vertical surface of

the base mount cylinder.

Air is added or removed from the air spring through its

top port. The top port of each spring is connected to a

reservoir and the air supply pipes. The reservoirs are

required to hold additional air due to the compact design

of the springs.

Rear Axle Level Sensors

Hall effect sensors are mounted on the left

and right sides of the rear suspension for

ride height detection. They are pivoted by a

coupling rod through the rear axle swing

arms.

The hall sensors produce a varying voltage

input to the control module as the suspen-

sion height changes.

If the vehicle is equipped with Xenon head-

lights the right side sensor contains an

additional sensor for the automatic head-

light level adjustment system.

Warning Displays

If the system is faulted and off-line or set in the transport mode, the following is displayed:

Basic Cluster: A warning lamp indicator is illuminated used on the basic cluster.

High Cluster: A message is posted in the high cluster matrix display.

E39 Features 07

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BMW 740iL Reparaturanleitung Seite 17