I have a 2006 Nissa Xterra. Both rear passenger doors will not open. There is some motion in the door lock using either the key or Fob, but the doors will not budge from the inside or outside.

Get a locksmith to make a key for the door. that's the only way to disarm factory alarm is by unlocking the door with a key

Handle broken inside door possibly . Plastic parts . Happens on all make an model vehicles . Most of the time driver door handle goes first , used the most .

If you're comfy with manuals then i know few websites that can help you with it. Bcause I've bought
it from various websites so I know how each site deals. try www.reliable-store.com
Very helpful

I imagine the obvious answer is to use a key in the door lock cylinder. The reason you have done this is because there is no door lock cylinder! You only have a fob is my guess, that electronically opens the doors. Dead battery..and the fob no longer works. Don't worry, examine your fob and there should be a way to open it. Carefully open the fob and surprise! There is a key inside of it! Now take that key and there ahould be a key lock cylinder above your rear license plate. You should be able to open your rear hatch. Now somewhere to the drivers side in the rear compartment there should be some sort of pull you can use which will open the drivers door. Hope that helps you out!

you'd better call a mechanic in your place.

This worked for me on 2008 Mk5 Golf, after the rear passenger door would not open fro outside or inside.

Hold the inside door latch open and keep it extended, then with the key fob open and close the door locks (still holding the inside latch open). Keep locking and unlocking the door, then it made a kluck and it released.

Can be issue with the switch.
Help links are provided below for detailed procedure,Click the link below:---
Front Door dis-assembly diagram for Toyota car?

http://repairhelpcenter.blogspot.in/2012/02/front-door-dis-assembly-diagram-for.html

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Rear Door dis-assembly diagram for Toyota car?

http://repairhelpcenter.blogspot.in/2012/02/rear-door-dis-assembly-diagram-for.html

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How to test Power door locks? http://repairhelpcenter.blogspot.in/2012/02/how-to-test-power-door-locks.html

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right side slide door light switch on Toyota Sienna? http://repairhelpcenter.blogspot.com/2012/01/details-for-replacing-right-side-slide.html

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Door locks not working? http://technoanswers.blogspot.com/2012/01/door-locks-not-working-on-ford-explorer.html

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Power door locks not working? http://schematicsdiagram.blogspot.com/2011/12/power-door-locks-not-working.html

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Repairing car Door lock Actuator?
http://howtobyme.blogspot.com/2011/11/repairing-car-door-lock-actuator.html

How to Access car door panel?
http://howtobyme.blogspot.com/2011/11/how-to-access-car-door-panel.html

Vehicle door panel components?
http://howtobyme.blogspot.com/2011/11/vehicle-door-panel-components.html

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This will help.
Thanks.

get remote checked wires might need re soldering or replace remote with new one. Cheapest place to purchase one is at a key cutting place or lock retailer.

You mean you left the FOB in the car. Go to the rear corner of the side the FOB is on (just behind rear wheel of side the FOB is on). "Bounce" the car up and down 5 - 10 times. Try the door. FOB has small motion switch in it and it might move enough to activate "auto-open" for locks. This will only work if "auto-open" is enabled in "Options".