My 2010 dodge caliber rear window washer sprayer will not stop spraying when wiper is turned on. it sprays till i turn the wiper off. only the rear it a problem

Sounds like you might have a bad multifunction switch. You can test the outputs of the switch to confirm.

faulty switch. I would replace that first thing.

Switch is faulty is the first thing comes to my mind. Your spot on tho in your diagnosis, although you may have two pumps and tanks, one for front, one for rear. I would check all my fuses just to be sure, and I would look at all my waster tubes and make sure they are not clogged, check your nozzles too, as sometimes wax can clog them up.

washer pump needs replaced

Sounds like the spray nozzle is bent or partially plugged up.

This sounds like a bad switch, try dissconnecting the switch for the rear wipers and see if it stops if it does then replace the switch, the motor is pretty get and dry if it runs and the sprayers spray then it sounds like the switch is stuck or bad.start there,

I have the same problem with my 2000 chevy blazer as skornec had posted. I kinda already figured the hose or spray nozzle was plugged. But the problem with checking those items is that I don't know where the hose is located to the back wiper. And the only thing that could be I see that could be the spray nozzle doesn't even have holes that washer fluid could spray from. So basically I just would LOVE if someone could please inform this lame brain of where to find the spray nozzle on the rear window and where in the interior of my blazer does the washer hose run.

they have a controll module afixed to the wiper motor itself. these modules have been an issue for gm for some time. they are very simple to replace and "usually" fix the issue.

You may have a line disconnected or the tank may be emply? Are all lines connected at the rear blade? I believe the fluid comes from the front tank under the hood. Check the lines from the tank.
Also check the pump. Can you hear the pump when using rear wiper/washer?

This could be 2 things.

First of all, check for any debris blocking the sprayer holes.

Secondly, open the hood and make sure the hose running from the washer fluid tank is connected to the bottom of the sprayer.