I assume it want work from either switch or remote so the problem has to be a bad sliding door motor or sliding door module but the only way to know for sure is with a scan tool.
Montana sliding door not working.
Originally would click once when key turned.
2000 pontiac montana all power working inside cabin.
Most sliding patio doors have one or two small holes at the top and bottom of the door for adjusting the roller height.
I can hear the doors lock click when i press button to lock but no sound to unlock on all the doors.
Already replaced starter and solenoid.
To clean and lubricate the hardware of a sliding closet door use a stiff brush a toothbrush or a hand vacuum to clean dust from the tracks.
These hole are often covered with a plastic plug.
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.
Her dad got her a starte.
I fixed it but typically it may have to be replaced if bad.
Posted on may 27 2009.
Battery voltage 12 9 no load 11 6 load.
The other side do not work even sliding door do not work until the engine is turn off.
Remove the plug and use a screwdriver to tighten and loosen the roller height making very small adjustments and testing each time.
Then work both the lever and gas door back and forth until it the sliding door works right.
Use an aerosol lubricant to lubricate all the door rollers.
I have an new car that i have to problem my lights the way the doors locks setting the alarms.
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.
04 pontiac montana sliding doors no longer work.
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.
Tried boosting no luck.
And please accept.
The sliding doors on montana assuming there power have a electrical harness on the bottom track that break and jam the doors but unlikly both have this problem do the doors lock unlock if not check switch at drivers door.
If the rollers are damaged install replacement rollers available at home centers.
Work the gas door back and forth.
Honestly testing the power sliding door you will need some diagnostic tools nevertheless the power sliding door has a fuse in the interior fuse box labeled ign 1 so make sure its good.