E36 M50 Coupe 1993 Rear Parking Sensor/s

[gphillips]

Hi

I have recently purchased a 1993 E36 325i coupe. I was suprised to find it fitted whith what I assume is a factory fitted set of rear parking sensors (perhaps somebody can confirm factory fitted)

Basically they dont work. I have an Auto box and frequently when I shift to reverse after having been driving, they beep constantly for around 4 seconds then stop. other times when I shift to reverse they dont make a sound. In either case when I approach a wall, they never make a sound regardless of how close I get.

I have had the car 2 weeks, and on ONE occasion they worked PERFECTLY. I moved away from the wall and back again a dozen times to test and it was sweet! - but only this once.

This suggests to me the curcuit has power so it cant be fatal? - Also the fact that there is frequently a tone when I shift to reverse gear must be a good sign?

Is there a control unit for this system hidden away somewhere? - Is there anything obvious to check?

Any help would be very much appreciated.

[bad man working]

Yes it sounds like factory PDC (park distance control) the long tone tells you it’s got a fault then it turns its self off it’s probably a faulty sensor get the fault memories check and that’ll tell you which one

[gphillips]

Originally posted by bad man working@Apr 21 2005, 12:31 PM
Yes it sounds like factory PDC (park distance control) the long tone tells you it’s got a fault then it turns its self off it’s probably a faulty sensor get the fault memories check and that’ll tell you which one

[snapback]335930[/snapback]

Thanks for your reply. What do you mean by "get the fault memories check" ?

Is there an easy way to isolate or by-pass a faulty sensor, or identify it? Last night it worked again, but then again stopped working. Clearly a fault, but sometimes is OK.

Thanks