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Marty, Mercedes Technician
Category: Mercedes
Satisfied Customers: 53001
Experience:  Bosch Certified Master Tech. Over 35 years experience.
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My Mercedes C320 car alrarm keeps going off for no reason.

Customer Question

My Mercedes C320 car alrarm keeps going off for no reason.
JA: Have you tried locking and unlocking the driver's side door using the key itself?
Customer: No.. I don't actually have a key besides the clicker thing
JA: What year is your C320?
Customer: 2001
JA: Are you hoping to fix this yourself? What have you tried so far?
Customer: I was hoping to fix it myself
JA: Anything else you think the mechanic should know?
Customer: The right passager door lock is broken so I always have to manually unlock and lock it but usually it stays locked on its on.
Submitted: 2 months ago.
Category: Mercedes
Expert:  Marty replied 2 months ago.

Hi, the common fault is a defective alarm siren. Replace the siren and it will more than likely cure the problem.

Let me know if you have any questions.