C5 Allroad FE RNSe problem
 

At the end of their time, the C5 Allroad got and RNSe head unit. Mine is not working in the car but works fine on the bench. When plugged into the cat nothing. When on the bench if I put 12v across pins 12 (KL. 31) and 15 (KL. 30) on plug D, on it comes. I've tried a known good unit in there and I'd had the same result.
There is 12v on the plug.

I think there must be something stopping it coming on from one of the 4 plugs in the group. Maybe a voltage that is there that shouldn't be?

Any help greatly appreciated.

http://forum.a8parts.co.uk/attachmen...1&d=1699634505