Cheers Mark, its quite strange though. One of the numbers reads 028419. When I google this I find ebay adds of a Mercedes phone module which look very similar.
Prob a standard part also supplied to BMW, or has a previous owner fitted a merc hands free kit to my CSL?
The other number on the side is 11177 0803 and 30 60 09 120, but I can't find much on that.
The car is also beeping when it gets raised up and down on a lift. Is that some sort of OEM built in alarm / immobiliser, or does it also sound like something 3rd party?
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