confused about 406 keypad

please help. red and green lights lit on immobiliser keypad,can't start it,had the car for three years never had problem before. The AA has tried everything on their database,checked all the wires behind keypad,tried brand new keypad-no joy. I've read there is a multiplug near the battery that could be the problem,not really sure what i'm looking at.Heard and read all different views.Has anyone cured this problem or knows what to do.All help appreciated as an auto electrician said it could cost hundreds. It's a 97 406 2.1td THANKS.

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patie
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