Pull the steering wheel. Remove the wire leads to the turn signal/wiper/light
switch cluster. Remove the three screws that hold the assembly to the column
and remove the assembly. Simulate operation of the washer function  on the
assembly and note where the contacts are touching. Use an ignition points
file or fine emory to clean the contacts. Re-install. This should fix the
problem. If not check that the washer motor is working.

Ken Hunter
82 Westy 1.9D
84 Jetta 1.6D
89 Mitsubishi van