How to I get the rear window wiper on my 99 oldsmobile silhoutte to work

dude u need 2 learn how to spell dependends on the year

Sounds like you a new wiper motor pulse board module.

Common problem. This link will provide the solution even though they are not talking about a Silhouette it is the same exact problem.

http://www.automotiveforums.com/t767192-wipers_stop_in_upright_position.html

Did you try bending the metal arm going to the wiper blade so there is enough pressure to make the blade contact the window better. I just did one two days ago and if im reading what what you are saying right its is the same problem and it fixed it

I had the same problem with my 99 Silhouette...after they put in a new windshield wiper kept going over the side of the window and tearing the blades up....ended up that the wiper arm was out of adjustment ....they came back and readjusted and it was perfect

are all the doors shut, if so could be a bad sensor on one of the doors.

Unscrew inside panel on tailgate (3 screws-1 each side, 1 in the middle), unclip and remove by pulling up and out towards the rear. Unscrew all screws holding steel plate down, unclip plastic clips that hold the rod running behind the plate and unhook rod at top of that opens the window. Unclip wiring harnesses, remove wiper from the outside (1 nut holding it down)and unbolt the motor. It is pretty self explanatory once you have the steel plate removed, just remove and install the screws and clips in the same order and try it out before you put all your screws back into the steel plate since there are so many. Back window must be closed for wiper motor to work. To save yourself from replacing the motor with a new one, 9 out of 10 times it is simply the locking washer has come off of the gear inside the motor, if you pop off the plastic motor cover you will see the washer is off the gears are out of place. I realigned the gear and replaced the washer with a "C" clip and it has been working great for over a year!

Check for power to your rear wiper motor. To do this you will have to remove the rear door trim. Once the door trim is removed check for power at your connector plug on the rear wiper motor with switch on. If there is power there than replace motor if not then start by checking fuses (which is a good idea to do before removing door panel because it's the easiest thing to check), connectors and wiring for damage and open circuit( cuts or broken pins in connectors or open/broken wiring)

the reserve for the back wipers is built into the same one as the front wiper reservoir.if u look on the side of the reserve it has two pumps.the one toward the back of the reservoir is for the rear pump.sometimes the line that runs off of that pump can come unhooked about 6 inches from the pump.hope this helps.please rate me.

their is a radiator fan switch or coolent temp sensor that cuts it on possibly a relay but first unplug the sensor fans should turn on if not possible it has a bad fan motor