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Alarm Control Unit on 300C 2nd Generation 2014 (UK right hand drive)



The car alarm sounds whenever the doors are locked. A professional garage has identified via the OBD2 that the alarm control unit battery is low. Could someone please advise me:

Where is the alarm control unit located on the car so that I remove it?

Can a new battery be put into the alarm control unit or does it require a replacement unit?

If I buy a used alarm control unit, will the ECU (or whatever) recognise and communicate with the used part, or can I get it programmed/coded, or do I need to buy a new unit?


Any help would be very much appreciated. Thanks.

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