BMW - Park Distance Control (PDC)

[brucemillar]

Friends

On my 4.8is which is a 2006 model. The PDC is not working correctly. So when I select reverse I get a single long tone with the light going green. Which (I believe) indicates a fault in the system?

I connected the car up to my BMW icarsoft which can/should read the e53 PDC.

It cannot communicate with the PDC ECU? This gives me a communication failure on the icarsoft that asks that I retry etc.

I can see all the other ECU's in the car and interrogate them without issue using the same icarsoft tool.

Can I assume from this that the PDC ECU in the trunk is broken?

My Radio (that sits in front of this ECU) was broken (no sound output) and had to be repaired (not with water damage) so I am thinking that the PDC ECU may have gone the same way.

I hear no ticking at the sensors with the car in reverse and from the ones I can see? all four rears and the two outer fronts, they are all connected OK.

Any thoughts? I can get a replacement ECU fairly cheaply from ebay.