Not sure if there is one.
Is it sounding off at irregular intervals? This is a common failure mode due to the rechargeable batteries leaking and damaging the circuit board.
On many cars the siren is behind the nearside wheel arch liner and is an easy DIY job to disconnect, remove and replace.
The siren is not an integral part of the immobiliser function and so can be removed and replaced once you have acquired a replacement.
Welwyn Merx Limited is a family run business with genuine passion, dedication and 25 years of experience dealing with Mercedes-Benz and AMG passenger cars. Tel: 01707 395999www.welwynmerx.uk
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