Light alarm

I recently found out that I have (or had) an alarm to tell me I had opened a door and left my lights on! it worked for one day! and hasn't worked since. Anybody got any suggestions as to what could be stopping it from working full time?
 
You should check your battery connections and remove corrosion. Any wire on the battery that is not stock, is a good hint. Take off that red cap of the plus side of the battery and look inside. For the whole battery, any wiring and or connector that has a different colour somewhere inside and the terminals inside should go. Sanding them is best. Pictures will help.
 
Does the interior light light up when you open the door?
Yes the interior light works fine but only when passenger door opens. Could this be the switch? Also just noticed when pressing light switch on drivers side the light not always works.
 
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