How do I disable power rear door alarm? - 2005 Pontiac Montana SV6

stuck as in what?, car engine will not start and run.?
or shift lever stuck.?
or alarm only sounds full time, just this?????
alarm is disabled by using metal key at drivers door, unlocking door disables it (or rear hatch) "VTSS" system rules.
is the security lamp flashing? yes, see here.
OR? SKIM. SKIS? option.? yes,?
the immobilizer is glowing it lamp telling you , that fact?
http://www.wjjeeps.com/sentry.htm

there are 2 systems here
alarm , called VTSS
and immoblizer
called SKIM.
the dash lamps warnings tell you the status of both.
what are they? doing?

May not be a solution, but do you have keyless entry? If so and you have the fob in your pocket, pulling the handle will open the door and should disable the alarm. If no keyless entry, check the child locks on the rear doors to be sure they are off. Also check the fuses for the door locks to be sure they are not blown, there may be more than one. Finally, do you have to press "lock" twice to lock all doors?

Use your key to turn the rear hatch key cylinder before going into your jeep. That will turn off the factory security system.

Now im not sure since the manual says your model has the same alarm system as the 328i and on the 328i you can remove the module to disable by doing the following. you can unplug the control module. It is located under the glove box. Climb under the dash on the passenger side and remove a few screws on the trim panel under the glove box. Theres a black control module with a green connector. There should be a lock tab on the connector. press the lock tab and pull out the connector. The alarm should now be disabled. But if it has the special transponder key this may not work.
But if the only reason you want to disable it is because of the motion sensor setting of the alarm for no reason there is a solution for this. To disable the motion sensor, hit the lock button to arm, then hit lock button again within four seconds to disable motion sensor. Red light on rearview mirror should flash four times, then pause, then start flashing on regular intervals. this is most likely the reason if your having the issue where the alarm goes off every 20 minutes.
If you want to completely remove it below is a wiring diagram taken from the manual for you alarm system.
this is from the manual its the alarm wiring diagram.
Battery Constant 12v Positive Wire ( ): Red/White or RedBattery Constant 12v Positive Wire Location: Ignition Switch Harness
Starter Positive Wire ( ): Black/Yellow or Black
Starter Positive Wire Location: Ignition Switch Harness
Ignition Positive Wire ( ): Green
Ignition Positive Wire Location: Ignition Switch Harness
Second Ignition Positive Wire ( ): Purple/White or Purple
Second Ignition Positive Wire Location: Ignition Switch Harness
Parking Light Positive Wire ( ): Gray/Purple and Gray/Yellow. Use Both Wires. This vehicle has a dual parking light system that will require 2 extra relays.
Parking Light Positive Wire Location: At Headlight Switch
Power Door Lock Positive Wire ( ): White/Red
Power Door Lock Positive Wire Location: At Factory Alarm Plug. The alarm plug is a black 12 pin plug located just behind the glove box.
Power Door Unlock Positive Wire ( ): Blue/Red
Power Door Unlock Positive Wire Location: At Factory Alarm Plug. The alarm plug is a black 12 pin plug located just behind the glove box.
Door Trigger Negative Wire (-): Brown/Gray
Door Trigger Negative Wire Location: At Factory Alarm Plug. The alarm plug is a black 12 pin plug located just behind the glove box.
Domelight Supervision Wire: Turns On With Unlock
Domelight Supervision Wire Location: N/A
Horn Negative Wire (-): Brown/Red or Brown/Yellow
Horn Negative Wire Location: At Steering Column Harness
Tachometer Wire Negative Wire (-): Black
Tachometer Wire Negative Wire Location: At Instrument Cluster
Brake Light Positive Wire ( ): Blue/Red or Green/Red
Brake Light Positive Wire Location: At Switch Above Brake Pedal
Factory Alarm Disarm Wire (-): Disarms With Factory Remote Only. Factory Alarm Disarm Wire Location: N/A
Factory Anti-Theft System: Transponder Anti-Theft System, Requires Bypass And Extra Ignition Key. The 1997 model year vehicle may require a bypass module and an extra ignition key, if vehicle is equipped with a special key from BMW.
Factory Anti-Theft System Location: Transponder At Ignition Switch Tumbler
if you require further assistance please let me know and i will help assist you from there. Thanks, Midwest-Tek

find the alarm underneath the seat or in the hood, cut ff the wires on the alarm system... or find the source of the alarm and cut the power...

Nissan does not have motion sensitive alarms. Your vehicle has an aftermarket alarm on it. Nissans audible alarms will only go off if you open the doors, trunk/rear lift or hood.

My 2000 Beetle does same thing (although not all the time). Just found an internet post that suggests there is a problem in the door lock sensor. I assume you are using a regular key - not
the keyless entry - like I am. He also said that you can disable the alarm (also disables the
keyless entry - which doesn't bother me) by leaving the front door AND the rear trunk open and
starting the car up. Seems to work so far. I will get the door lock sensor replaced and turn the
alarm system back on (not sure how yet), and let you know if that stops the problem.

if alarm is activated, it could be shutting off the starter, hence no starting....you may have to have a locksmith or electronics place disable the alarm so you can at least drive the thing

Use your door key and unlock your drivers door ... that is what disables the alarm system. Make sure that the battery is rehooked... because i'm sure you took the battery loose when you couldn't get the alarm to turn off.

You cant disable it realy..but you can use the key to unlock the driver door or the rear door. Both have a alarm shut down wire..Also that wire could be broken in the drive door boot...very common. The wire is purple and yellow..Touching the wire to ground shuts the alarm off. Just make sure if its broke that the end going into truck is the one you groung on the frame. Also locking the doors from the inside with the driver door open is what activates the alarm. That wire can also be found in the drivers side kick panel.....