Notes for Service department

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After replacement of the PMA control unit or one of the ultrasonic sensors, no initial start-up is required. However, the control unit checks every time the engine starts if the sensor software is compatible with the control unit software. If they are not compatible, a corresponding fault code is set in the PMA control unit. In this case, the service function Updating Software for Ultrasonic Sensors needs to be run.

The PMA control unit monitors itself for faults and, if needed, makes appropriate fault entries. This is not always possible in exceptional cases. This means that the control unit is not able to detect if the ultrasonic sensors (including sealing ring) is correctly installed or clipped into position. Or if the bumper is damaged near the ultrasonic sensors. This can give rise to the following customer complaints without supporting fault entries:

Small parking spots are only occasionally detected
When parking, the vehicle passes either very closely or very wide of the vehicle in front
After the parking operation, the vehicle is either very far from, or very close to, the curb.
The vehicle is parked at a sharp angle in the parking space.

In these cases, check to ensure that the ultrasonic sensors are correctly installed, and that the bumper near the ultrasonic sensors is undamaged (see FAULT PATTERNS ).

We can assume no liability for printing errors or inaccuracies in this information and reserve the right to introduce technical modifications at any time.