Why don't wipers work on high? - 2004 Lincoln Town Car Ultimate L

Yukon what ? just a plain yukon ? 2WD or 4WD XL - Denali etc...
No pulse board . controlled by the BCM - body control module . Taking the vehicle to a qualified repair would be your best bet .
Windshield Wipers
The windshield wiper/washer switch signal circuits are inputs to the body control module (BCM) and the BCM controls wiper motor low speed operation, washer pump and high speed operation. The windshield wiper/washer switch is provided a low reference from the BCM and each of the switch signal circuits is supplied 12 volts through a resistor and monitored within the BCM. During LOW or INTERMITTENT operation the wiper switch low signal circuit is closed to the low reference circuit through a series of resistors within the switch assembly and the signal circuit voltage monitored by the BCM will depend on the switch contact location to the resistor assembly. During HIGH or WASH operation the high and wash switch signal circuits are closed directly to the low reference circuit within the switch assembly and nearly all the signal circuit voltage will be dropped across the BCM resistors. The BCM controls the wiper motor through the Wiper Relay and the Wiper High Relay. During any wiper motor function that uses low speed the BCM supplies the voltage to energize the Wiper Relay and battery voltage will be supplied from the Wiper Relay through the de-energized Wiper High Relay to the wiper motor low speed control circuit. During high speed wiper motor operation the Wiper Relay is energized as in low speed and the BCM provides a ground to energize the Wiper High Relay and the battery voltage is supplied to the wiper motor high speed control circuit. Wiper motor park operation is controlled by the BCM using an input from the park switch within the wiper motor assembly. The BCM supplies the park switch signal circuit 12 volts through a resistor then monitors the circuit. Whenever the wiper motor is out of the park position the park switch signal circuit is closed to ground and nearly all the signal circuit voltage will be dropped across the BCM resistor. When the wiper switch is turned to the OFF position while the wiper motor is somewhere in mid-cycle, the BCM will continue to operate the motor until the wipers reach the park position. If the ignition is turned OFF while the wipers are in mid-cycle, the wipers will stop immediately where they are and the BCM will park the wipers the next time the ignition is cycled ON.

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My windshield wipers only work on high speed...? ' Yahoo Answers

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Common GM Wiper Problem - YouTube

? 3:23
https://www.youtube.com/watch?v=kc6e2Tmar68
Oct 25, 2010 - Uploaded by roadragecustoms
The windshield wipers only worked occasionally. ... My 1998 dodge ram wipers only work on high will this help me? thanks.... Express van. you have to take out the motor and the transmission from under the front of the van..

may be you should make a diagnostic and you can do it in a garage or you can do it by yourself if you want to do it by yourself you need some tools and you can find some good ones here: digiprog3

I think you should change the wiper motor I had the same problem with my toyota echo good luck

replace the light switch

The intermittent function for your wipers is controlled by the wiper control amplifier. This is an integral part of the wiper (combination) switch and is serviced only by replacing the switch assembly.

usually attached to the motor in the form of a black box.

most likely cause is the wiper switch has gone bad and unable to 'time' the intermittent speeds.the intermittent speeds work on a resistor type system where low and high speeds add direct voltage.

Mine was the Body Control Module (BCM). Switched it out (needs to be programmed) and everything was fine.

Sure pull the cover off the arm at the base(by the bottom of the windshiel) under that you will find a bolt. Unbolt the arm and pull it off then adjust both arms so that they do not entangle at the high point. You can turn on the wipers and when they reach the high end quickly shut off ignition they will stop at this position so you can adjust them, This is what we would do at the shop for about 200 bucks. Take your time and be sure to tighten everything up when you're don and you will do great. Have fun.