Hi guys firstly i know there are threads about this but none are of much help. my side door wont lock or unlock when using key fob or the button near the gear stick i know there is a black box with a few wires going into it wich i think is a reed switch for filler cap and side door which is located behind the pannel on L/H/R ive taken the box apart and its all corroded inside could this be my problem ? if so is there a chap easy fix ? there is a thread on reparing this but i dont understand it at all. all other doors work using key fob. thanks.