951master

Hello all, having some trouble with my driverside sliding door, car is an -03 grand voyager limited and has electric powered sliding doors.. problem is, it wont open, just unlocking ant then nothing more.. it seems like a contact somewhere dont send a signal to tell the electric motor to take over.. sometimes from time to time it works just fine, but bot often... where do i first look for faults? grateful for help.. cheers//Richard