Manual Steering-Column Adjustment

WARNING: This page is about a different car, the 2007 BMW 550i and 2006 BMW 550i. However, it is still accessible from the selected car via links, so may be relevant.

The driver is able to adjust the steering column with a switch. When the switch is operated, the signal is transmitted cyclically from terminal 30 (cycle time: 100 milliseconds). The steering-column adjustment is actuated for as long as the signal is being received.

Once the switch is no longer actuated, the message "Stop" is transmitted 3 times.

The steering-column adjustment is stopped when this signal is received, or if the cyclic message is not received twice.

To enable a failure of the steering column switch cluster to be detected, a further a cyclic message is transmitted when the data bus is active (cycle time: 1 second).

When changing the direction of adjustment, the centre console switch cluster first actuates the switching motor.

The actuation of this motor is time-dependent. The adjustment motor is not actuated until the direction of adjustment is correctly set. The total adjustment movement is no more than 36 millimetres for tilt adjustment and 40 millimetres for reach adjustment.