w204 c class estate rear window alarm

[scottlogger]

Hi , I have a 2013 c class estate which has a problem with the rear window alarm system. The car will sit for 3 to 4 hours then the alarm goes off, the star check I had done indicates that the fault is a broken rear window although it is not broken. I would expect the alarm to go off straight away if there is a fault on the windows sensors. I fitted a new battery thinking it may be a voltage drop but that didn't resolve it. Could it be the siren internal batteries need replacing or siren replacement. Any suggestions would be gratefully received.

 

[AMGeed]

Could it be the siren internal batteries need replacing or siren replacement. Any suggestions would be gratefully received.

This is the problem. The windows don't have alarm sensors.
Get yourself a new alarm siren. Approx £110 from the main dealers.
It's a direct replacement with no coding needed. It's behind the rear arch liner against the bulkhead on the offside front.
Item # 50 in the parts diagram below.

FG 204.348 - BURGLARY ALARM SYSTEM > Mercedes EPC Online > nemigaparts.com

Parts catalogs. Spare parts catalog Mercedes EPC Online. Mercedes. Car. BURGLARY ALARM SYSTEM.

nemigaparts.com

 

[scottlogger]

This is the problem. The windows don't have alarm sensors.
Get yourself a new alarm siren. Approx £110 from the main dealers.
It's a direct replacement with no coding needed. It's behind the rear arch liner against the bulkhead on the offside front.
Item # 50 in the parts diagram below.

FG 204.348 - BURGLARY ALARM SYSTEM > Mercedes EPC Online > nemigaparts.com

Parts catalogs. Spare parts catalog Mercedes EPC Online. Mercedes. Car. BURGLARY ALARM SYSTEM.

nemigaparts.com

Many thanks for that.