Sigma alarm problem

robs-mbz

Senior Member
Joined
Dec 9, 2006
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Location
Newcastle under Lyme
Your Mercedes
1997 E300TD
Not a Mercedes problem this time but I could do with a bit of help!
My sons Fiesta has got an after market Sigma alarm fitted. Some times it is difficult to set / unset the alarm using the key fob. I am wondering if the battery in the fob is on its way out but I can't see any way of opening it to replace! He has a spare fob and this is exactly the same, sometimes it works first press, other times it takes several presses, could there be a fault elsewhere? Any help would be much appreciated.

This is the type of fob.

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