That's my fix when the alarm goes wonky.

Pull up carpet on the passenger side, remove fastener, pull the plastic panel and pop the connection off the alarm module. No! No! Not the red connector!

Reassemble in reverse order.

Fixed!

Jim

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14 E250 BlueTEC black. 45k miles
95 E320 Cabriolet Emerald green 66k miles
94 E320 Cabriolet Emerald green 152k miles
85 300TD 4 spd man, euro bumpers and lights, 15" Pentas dark blue 274k miles