Basically if you take the top off the steering column shroud (the one that just pulls off) you should be able to see the plugs that connect to the stalks lighting on one side and wipers on the other. If you disconnect the wiper plug on the loom end it should be numbered and lettered row A 1,2,3,4,etc row B 1,2,3,etc.
The two that the washer motor is connected to are pins B1 and A4, now you can either chuck some volts up its ass and see if the pump runs or more safely and if you've got a meter test to see if you can pick up the pump motor down the loom and see if the contacts on the stalk close at the stalk end. Should find your problem as you'll test the only two bits of the circuit really.
If your not a million miles away I don't mind having a look, revel in this sort of stuff
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