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Calibration

Calibration


The stepping motors need no feedback to the control module (position sensor). By sending a known number of pulses, the control module always knows how far a flap has moved. This is possible on condition that the control module has calibrated itself by turning the flaps to their respective end positions so that it knows the position of the flaps.

Manual calibration can be performed by starting the motor and simultaneously pressing the AUTO and REC buttons.

Calibration is confirmed by SID and the message "ACC: CALIBR. STARTED" is shown on the main instrument unit display. This takes approximately 20 seconds.

Manual calibration must be performed if the stepping motor is replaced, removed or if the position of the flaps is changed. Calibration must also be performed when the battery has been disconnected.

An automatic calibration takes place:



• after 5 operating cycles and when the ignition has been off for more than 120 minutes. This takes place for the fifth time in the 119th minute before the ACC control module enters rest position.


Diagnostics

During calibration any diagnostic trouble codes for the flaps are stored in the ACC unit and can be read using the diagnostic tool.