Alarm

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Nickos

Member
Joined
Jan 6, 2016
Messages
34
Location
London (S/W)
Car
CLK 320
Hey All,

I've come to the end of the road!!!

I have a 2003 clk 3.2.

The car went to MB for a service and a I asked them to look at the factory fitted alarm as it was sometimes going off when nothing was wrong. MB came back to me and said, it's the car's battery needs to to be changed and the reason it's been going off is because it's to tell me the battery has needs to be changed out.

I've never heard of this before so I got the battery changed (not at MB as they wanted just under £300. Halfords done it for me for half that) and what happened yes at midnight the bloodly thing was going off!! Should I just change the siren?

Thanks
Nick
 
Which battery did you change? - I'd guess they meant the one in the alarm rather than the main battery in the car.
 
As above, its located in the front wheel arch. The battery cannot hold a charge within the unit. Nothing to do with the main car battery.
 
as above - its the backup battery in the alarm unit, £100, plenty of threads on MBClub to search
 
When mine goes I am going to try and repair it. Clean and reseal the board, replace the nicads then reseal the case.
 
The problem is, when the siren becomes faulty, components on the PCB are already damaged and it’s then too late to repair by replacing the batteries, however, if the batteries were replaced before the siren becomes faulty then that might extend the life of the siren for another few years.

Dec

alarmPCBbig.jpg


Siren%20battries.jpg
 
Thanks all.

I have spoken to a specialist they will fix it for £100 plus the part for £100.

Just peeved that MB didn't tell me they become faulty, instead telling me to replace the car battery!! Well live and learn!

Cheers all, I close this thread if it solves the problem.
 
The problem is, when the siren becomes faulty, components on the PCB are already damaged and it’s then too late to repair by replacing the batteries, however, if the batteries were replaced before the siren becomes faulty then that might extend the life of the siren for another few years.

Dec

Wash it all in good flux, resolder dry joints, check tracks, job done :)

Its not a multi layer board so there are no hidden tracks
 
That picture below is 4000x2248 pixels in size, if you view it full size you will see some of the electrical components on the PCB have been cooked, so it would all depend what needs to be replaced as well as cleaning the tracks.

Dec

alarmPCBbig.jpg
 
Yes, if its component level I would just bin it, but still worth a play with.
 

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