W251 R class Parking sensor control module location?

[The Rev Dr Syn]

Hi, can anyone tell me where the PCU is located in the R class?

I picked this car up yesterday and I'm getting two red dots in the front distance indicators and a beep before the system shuts itself off. Turning the system back on has the same result. I have not yet seen any lights/noise from the rear indicators.

The front sensors did work briefly yesterday but entered a fault state again when we next dropped below 15mph.

I realise I could do with getting it on a diagnostic machine, but I would like to do some visual checks before I do that incase it is simply a bad connection somewhere.

TIA for your help

 

[mioba]

Unless you are an electronics circuit guru i doubt you could spot a loose connection on the PCU.

Best to get on diags as its probably a sensor out / loose connection in the bumper.

 

[The Rev Dr Syn]

I decided to do a visual check as far as I could and I'm glad I did, I managed to find the problem by fluke when chasing the looms through the car and found that the loom was disconnected in the cubby behind the R/H rear lights. I connected it back up and now the system works perfectly. I'm glad I did check as the diagnostics would have probably told me all the rear sensors had failed.

I can only assume the loom was disconnected by mistake by whoever installed the towbar for the previous owner. I'm just glad it was an easy an inexpensive fix once I found it!