The wiper circuit that controls (in this case that opens the ground circuit of the motor)the motor is staying closed to ground...it needs to be open when in delay mode...so that the delay circuit can control the opening and closing to ground. OR the delay circuit has an open circuit...burned up capacitor, relay, etc. Or it could be a stuck parking switch...which should open on in park mode...however the wipers would stay on until you turned off the wiper switch. Also, old cars up to 1980 or so...used ground type switches whereas new cars use powered switches and relays to latch the motor to ground.
On my 1995 Ford Explorer , two of the intermittent wiper positions stopped working and I would have to push the windshield washer squirter button 2 or 3 times before fluid would squirt . It turned out to be the multi - function switch inside the steering column ( turn signals , hazards , wipers , high beams etc . ) A Ford dealer changed it quite a few years ago and I've had no problems since
The multi-function switch inside the steering column has the turn signal lever and hazard lights button extending outside of the steering column it operates - turn signals - flash to pass - high beam headlights - windshield wipers ( on/off ) and intermittent speed settings for the wipers - windshield washer fluid squirter button
The wiper motor can be replaced reasonably easy, however your particular problem is usually caused by the circuit board that controls the wiper motor and the delay cycles, retraction, etc. The board is also quite cheaper than the entire wiper motor. It is also called a wiper pulse or relay board and can be found online from around $25 and up. The electronic board plugs into the wiper motor, and the electric cable plugs into the circuit board.
General Motors had a recall on some of the delay modules. Call the dealership and give them your vehicle identification number and have them check to see if it applies or if there are any that have not been done. It is free and it does not matter if you are the 5th person to own it. A RECALL is FREE, a technical service bulletin is NOT.
The multi function switch is inside your steering column cover and the hazard button and the turn signal lever stick outside of the steering column cover ( so , turn signals , flash to pass , high beam headlights , windshield wipers - high / low / intermittent settings , windshield squirter button , hazard flashers ) I had mine replaced when 2 of the intermittent wiper positions did not work and I would have to push the windshield washer squirter button 3 times before I would get any washer fluid
The wiper relay is located behind the fuse box, third socket from the drivers side. This relay controls the low speed and intermittent functions. It also controls the motor to "park" the wipers down rather than just stopping them. The 1st relay is for the E-flashers and turn signals and the 2nd relay is for the low/high beam headlights.
Several possibilities are that: 1 the switch is bad on the high position. 2. There is a problem with the high speed wire from the switch to the motor. 3. The wiring inside of the wiper motor for the high speed is bad. The way 2 speed wiper motors work is there are separate windings inside the motor for low and high speeds. Usually 2 wires come out of the motor for low and high and the common ground through the wiper motor body to the chassis of the vehicle. You apply 12v to one wire and get low and 12v to the other one for high speed.
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