Open and close the power sliding doors twice with the overhead or b pillar switch to relearn the position.
Pontiac montana sliding door problems.
1 was the contact block with the problem in the door pins inside the door corrosion ate away where the wires contact the sliding pins.
The door will have to be relearned.
Work the gas door back and forth.
The door comes unlatched from the pontiac montana mini vans w o power slider also.
The 1999 pontiac montana has 10 nhtsa complaints for the structure body door at 3 480 miles average.
The vehicle was taken to an independent.
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Then work both the lever and gas door back and forth until it the sliding door works right.
I fixed it but typically it may have to be replaced if bad.
The automatic sliding door alarm disable.
The cable needs to be lubricated and greased at both ends.
The power sliding door fuse will have to be removed for 1 min.
2 which sounds mainly your problem is the actuator that opens the latch snapped the plastic arm causing it to work as your saying only when you manually open the door.
The problem is usually the gas door end try wd40 with the red stick in the nozzle and spry were the cable connects to the gas door.
Two problems power sliding door is initiating a fast warning chime.
If the door reverses and or stops prior to completing the two cycles the procedure will need to be repeated.
The contact stated that the power sliding door would not latch when closing causing the door to open when driving.
The contact owns a 2001 pontiac montana.