A3 Mk1
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Acoustic Parking System (APS) self-diagnosis
General information
On reversing, the parking aid system uses the echo-sounding principle to measure the distance between the back end of the vehicle and an obstacle. Four ultrasonic sensors are fitted for this purpose in the non-painted area of the rear bumper. The sensors are deactivated if a trailer is hitched up and the trailer socket connected. Proximity warning distance on reversing (parking aid system active):
The 4-channel parking aid system comprises:
Function: A self-test lasting less than one second is performed after switching on the ignition. The control unit is then permanently in operation, however the distance sensing function is only activated on engaging reverse gear. A brief signal tone sounds to indicate that parking aid is ready for operation (time lag of one second on vehicles with automatic gearbox on account of P-D shift). A continuous tone sounds for 5 seconds if the control unit detects a system fault during the self-test. The intervals between the acoustic pulses become shorter as a function of the decreasing gap. When the gap is less than 30 cm the pulses become a continuous tone. Adaption of volume and pitch (audio frequency) =>Page 01-475. |
