If you cannot manually unlock the door, use a rubber hammer and firmly rap the door at the striker/lock area while manually sliding the lock/unlock switch to unlock,it may take a few tries but should unlock.DO NOT lock the door again until you have lubed the lock assembly and are happy with it's operation.If it's an electric lock fail to unlock/lock,with the door open use steel wool on the door post electrical door contact pads once in a while.
SOURCE: power sliding door lock
I had the power sliding side door locks recalled on my 2003 Venture at Dealers expense.
SOURCE: 2005 Pontiac SV6 Montana key fob unlocks doors but will not lock
For the sliding doors you need to clean the contacts, there are 6 or 8 on both sides, just wipe them clean as they are probably covered in oil/grease/grime.
SOURCE: My 1999 pontiac montana rear sliding power door will not work
I went to bulldogsecurity.com and looked up the wiring diagram for this vehcle. However, prior to checking this part, I would check to see if you have a blown fuse. It doesn't hurt and only takes a few minutes. There should be a fuse for that either somewhere on the side of the dash or near the brake pedal area. If not it may be under the hood, but it should be inside the vehicle. You may have multiple fuse boxes. If it has (2) sliding doors it will have a wire for the auto doors in each kick panel (under the plastic trim/molding) when you open the door and look down you will see all of the trim/molding it should snap out or may be held in place with a screw or (2). Once you remove that you should see the wires. It says for the left side it is either light blue or black and the right side is definitely light blue. Trace this wire until you find out where it ends (the motor or switch to control the auto doors) Then test the switch/motor to see if it is bad.
SOURCE: 1999 Pontiac Montana passenger sliding door stopped working.
Verify the wiring harness which passes under plastic step & carpet at front passenger side. This wiring harness goes from the firewall to the pillar on the right side and some have crimped connectors in them to act as junction between two or more wires (ususlly the 12volt feed), which deteriorate with time, especially with Salt & Water. Then the electric sliding door stops working and even driver the electric seat can loose power.
SOURCE: 2000 Toyota Sienna Sliding Door Latches Stick - Safety Hazard
clean and lubricate door sliding mechanism and locks with silicone spray lubricant, clean all door seals and jambs
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