PDC not working, light flashes

[adrian.b]

Last weekend my reversing/parking sensors stopped working. I had just had a tracker fitted the day before and wonder if the installer has knocked something.

When I go in to reverse, the PDC light flashes and I hear a long tone (about 3 seconds). The tone stops, the light keeps flashing and the sensors dont make any noise when something is in the way.

Anybody got any experience like this?

If I take it to the garage under warranty work and they find out it`s to do with the tracker installation they wont be happy and neither will I but will the tracker installer have to pay for the repair?