1998 sienna driver side sliding door lock sticking

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.

So the sliding back door is stuck in the unlock position it sounds like?Also,the switch on the door...that locks/unlocks all doors?And is there an option to lock/unlock each individual door on that switch?Please let me know and I will see if I can determine how tedious it may be to self-repair or even just to troubleshoot.Also,do you have any electrical measuring equipment?Greg

To start, the noun "''rear latch switch'' is incorrect. It's actually called "Slide Door Lock". It's located on page BO-20 of the Toyota Repair Manual for the 2001 Sienna. There are two door locks on one sliding door. One in the front and one in the rear. Obviously, you want the one in the rear. The location for the "Slide Door Lock" (which also contains an electric switch) is in the rear of the sliding door located mid way up door. You can see (sliding door opened from the back) it without dissembling the door. And, the lock is made up of plastic (dirty white in color).

spray the lock mechanism with a white grease or a silicon lube

clean and lubricate door sliding mechanism and locks with silicone spray lubricant, clean all door seals and jambs 

sounds like the door lach is sticking
use some wd40 spray the lock and let it sit 4 a while
now since you have the inside skin off reach inside the door with 1 hand and try and open the door from the outside and see if the lock bar moves it usualy pushes down i think on a lach
if it goes up and down with no resistance make sure it is contacting the lach if yes make sure the door is unlocked
somtimes the lock is just stuck
after unlock open the door
push down on lock bar attached to lock then pull up on it if that fails to open door
after that all fails unlock door have friend pull handle and then give the door a good kick from inside just remember not the kick the glass

You have a sticking fuel door lock-device. Look to see if the tab is in the down position.

there is a door lock actuator that has failed, it releases the latches so the door can open. you need to remove the door panel. unbolt the window and tape it as to hold the window up then remove the window regulator assembley then unbolt the lock actuator from the back side.

Sounds like something isn't right.Try to disconnect the battery for a few minutes and see if that helps.Some times the ecu gets haywired and disconnecting the battery might reset it.And if it is the original battery you might want to get it tested.