SL 320. SRS light problem.

[mick benz 320sl]

Hi, I hope someone can help with this tricky one.
After having the original MB radio replaced with a new Bluetooth radio. On the odd occasion, On first start up if the SRS light does not light or is lit very dim I have the following malfunctions : Wipers don't work, radio don't work, indicators only flash for a left turn even when you try a right turn. This only happens 50% of the time on first start up. If the SRS light lights as it should on start up I have none of the problems at all for the journey .It only happens on first start up and only started happening since the radio change. I have tried disconnecting the new radio but still have the problem on occasion.

 

[Barnesautos]

I have come across this issue regarding the SRS lamp n/w - after extensive testing I believe it was a relay in the front sam that provides power for the acc circuit