When the selector is on delay, the wipers work continuously as if they were on low. Low and high positions work properly, except the wipers now park wherever they are at the moment you turn the switch off. Activating the wipers by using the washer turns them on as it should, but the wipers stop at any random position.
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You will need to diagnose this with a multi meter....on dark green terminal d at the wiper pulse board, with the wipers on any delay position, you should be reading .0005 Amps and 12 Volts and at the same time on the delay position one click below low(the fastest delay speed) you should be reading .0003Amps and 12V on terminal E gray wire, The purple wire (terminal C) should have 12V on high speed only. The yellow wire (terminal B) should have 12V when the key is on and the black wire (terminal A) should always be grounded....check all of that and we should be able to find your problem.
The Amperage should change on terminal E (the gray wire) with each position on the switch but the change will be very small. i.e. the first speed (longest delay) will read .000017 A, the second setting .00004 A and so on. Check that and let me know...(by the way, amps are checked in series with the connector so unplug it, place one probe in the connector and the other in the motor plug terminal. )
Likely the delay module needs to be replaced, If i remember correctly, yours should be located behind the kick panel on the drivers side. Most I've seen are actually labeled so it's not difficult to find.
you will need a new washer pump that is located in the washer reservoir and a new wiper motor cover which has the circuitry for the delay wipers. All you do is change them out with new parts and it will operate like new again