Hi Andy. There is only one tank, and only one pump. The wiring diagram in
my Haynes manual also shows only one. The wiring diagram seems to indicate
that activating the front wash sends power to the pump in one direction,
while selecting the rear wash sends power (down the same two wires) in the
Thanks, Jim. Funny thing is, the rear washer works, but the front doesn't
even spin. Do you think it's possible that there is something wrong with
the pump that would prevent it turning the right way to make the front
washer work? I notice that if the rear washer is working, then if I press
the button for the front washer, then the rear one stops. Looking at the
wiring diagram, I can understand how this would happen (they're a bit like
upstairs/downstairs double-pole lighting switches), so I guess that the
button is still working. If there are two motors in the same pump, then one
could be broken, but if it's the same motor spinning in two directions, then
it's a bit more confusing.
My guess is that there is a problem with the switch. And easy way to
test this is measure the voltage at the pump when the switch is on for
the rear and the front. You should have the same voltage, but opposite
It is the button (I think). I discovered that if you press it hard, then
the washer works. Strangely, if the switch is pulled back to activate the
rear washer, then only a light press of the button is sufficient to stop the
rear washer. I guess something needs cleaning inside that switch assembly.
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