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Originally Posted by wb4lbg
The rear sprayer on my '99 has never worked since I've had it (2 years now). Where would you look for the reason why not?
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Start with checking the switch and the pump. You can get to the pump by removing the plastic inner fender cover on the passenger side. If you have power going to the pump when the switch is pressed then I would say the pump is bad.
If you have power going through the switch but not getting to the pump then the relay may be bad. It is on the same board as the wiper relays. Check
HERE for more info on that.
I would think it would be a fuse, switch, or pump. In that order.
It could also be that the pump is working but the tube might be clogged or pinched somewhere.