Wiper sprayer won't spray windows front or back

Sounds like someone has had your washer fluid reservior out and placed the wrong line on the wrong pump. You should have 2 seperate pumps. Pull the reservior up and swap the lines from one to the other, then you should be good.

get a pin and unblock the injectors in the sprayer

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.

could be a clog in the line, or blockage at the spray tip, if its on a seperate switch from the front washers check to see if the pump is engaging while the button is pressed, if all washers are activated on same button it is probly the line or nossle tip.

washer pump needs replaced

it could be the fuse or the plug to the motors has come off. fuse is in the fuse box wiring is under the font bumper attached to the bottom metal part.

on my chevy blazer there are 2 pumps in the front resivior one goes to the rear wiper and the other goes to the windshield if you have 2 pumps one might be bad. there could also be something plugged in the hose. on my blazer the upper pump goes to the rear wiper. hope this helps.

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.

If it shoots from the pump without lines connected, then there has to be blockage somewhere. You mentioned you blew the lines out, did you blow directly back through nozzles themselves?