Question about 2002 Mercury Grand Marquis LS

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WIPERS PARK UP INSTEAD OF DOWN DOES THIS CAR HAVE A SEPARATE PARK SWITCH

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  • Mercury Master
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Yes the computer board in the box on the wiper motor is the park board

Posted on Jun 22, 2015

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Wipers won't turn off


The wiper motor is defective and needs to be replaced. Inside the wiper motor is a "Park Switch". When you turn the wipers off, the park switch sends a signal to shut the wipers off. If the park switch fails to operate then the wipers will continue to run, unless the ignition key is turned off. You will also need to inspect and test the charging system. Where you had no issue before the rain, you may only need to charge the battery. After the battery is charged it should be load tested, to be sure that it is fine. Also test the alternator and make sure that it is charging correctly (@14volts). If you need more information please write back. Good luck.

Mar 21, 2014 | 1993 Chrysler Lebaron

1 Answer

Wipers park at random locations during intermittent operation


the wiper motor does have a return to park function

Jan 20, 2013 | 2000 Ford Windstar

1 Answer

Wipers stuck straite up


problem with the park positioning switch on the back of the wiper motor That bit with all the wires. it can be reset but really a replacement unit is quicker

Jan 14, 2013 | 2001 Buick Regal

1 Answer

Hi i have a hyundai coupe fx, my problem is the front wiper , it works when u use it with the screenwash but will not work on intermediate,medium, and high,back works fine


sounds like your front wiper motor and linkages are fine, just a problem with the wiper switch.
i would drop by a dealer and ask to see the IPB on the wiper mechanism and switches for your car.
be patient and courteous, usually this service is provided free. then you will know the part numbers, approximate labor, and retail cost of all parts. if they have some time ask about any tech bulletins on the issue. sometimes the wiper motors have a separate component which runs the park function which moves the wipers down after the switch is turned off. mostly this is built in but there is a chance thi circuitry is separate and i would look there first before i pulled the steering column apart.

Aug 15, 2011 | Hyundai Tiburon Cars & Trucks

1 Answer

Wipers not parking... they stay in the vertical position on the windshield when I turn the wiper switch off. This happened after I had replaced a dead battery. Any ideas? Thanks, Brian


There is a separate live wire to park the wipers, you may have dislodged it when you replaced the battery. This wire should be live, even though the wipers are switched off and it connects slightly apart from the normal feeds.

Apr 01, 2011 | Saturn L300 Cars & Trucks

1 Answer

Wipers would not park, customer forced down wiper arm and broke off arm. Now no electric to wipers.


Before 1995 Ford interval wiper systems mainly consisted of a switch, the motor and the interval governor (also called the wiper control module or 'WCM'). The basic wiper systems just parked the wipers at the end of their travel at the base of the windshield and involved just one park switch.

The more complex systems not only stopped the wipers at the base of the windshield, but would actually recess them below the windshield to park them. This involved using two park switches to turn the wiper motor in a reverse direction. These were installed on the Crown Victoria, Grand Marquis, Town Car, Taurus and Sable.

The wiper switch (named 'Multi-Function Switch' on most models) had a common return or ground circuit and two input or signal circuits to the WCM. Basically, the switch was two modified potentiometers that varied the resistance to ground for the two signal circuits. When the wiper switch was placed in the low or high position, the WCM looked at only one of the circuits- the 'mode input' -and controlled the wiper motor accordingly. If the wiper switch was placed in any of the interval positions, the mode input told the WCM that the switch was in an interval position. The WCM then looked at the second input - the 'delay input' - and used it to determine the amount of delay between wipes.

1) To run the wipers on low or high speed, the WCM provided constant power to the wiper motor on the proper circuit to provide the requested speed. Dual park switch motors
1.1 The first park switch operated basically in the same way as the single switch systems.
1.2 The second park switch worked in the opposite manner- when the wipers were off the park position, the second switch provided a ground for the wiper motor. Power and ground were now provided by the park switches.
1.3 When the wipers needed to park, the polarity of the switches changed, and thus provided reversed voltage to drive the motor in the opposite direction.

2) To run the interval wipers, the WCM applied voltage to the wiper motor only momentarily to get the wipers off the parked position.
3) The electro-mechanical park switch made a circuit between the power feed in and the output to the WCM. Power was provided from the park switch through the WCM and back to the wiper motor.
4) When the wipers reached the park position, the park switch made a circuit between the ground and the output to the WCM, and the motor stopped running. The wiper motor and the wiper switch have remained much the same as the single park switch motors of the past.

The main difference is that the switch has become an input to the GEM instead of the WCM.
1) When the wiper switch is placed in the low or high position, the Run-Park relay is grounded by the GEM to provide constant voltage to the High-Low relay, which then provides voltage to the proper circuit of the wiper motor.
2) High-Low relay is in the low speed position unless grounded by the GEM.
3) The park switch not only feeds the Run-Park relay but is now also an input to the GEM. This tells the GEM when the wipers are in the parked position so it can de-energize the Run-Park relay.
4) When any of the interval positions are selected, the Run-Park relay is momentarily grounded to get the wipers off the parked position
5) The park switch then provides voltage to the other set of contacts in the Run-Park relay.
6) When the GEM de-energizes the Run- Park relay, voltage is still provided from the park switch to the High-Low relay and the wipers complete the stroke.

Click over diagrams for zoom:

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Hope this helps.

Feb 08, 2011 | 1993 Mercury Grand Marquis

2 Answers

I an '03 Chevy Venture van whose windshield wipers won't go down.


Your windshield arm is in need of repositioning. Take off the cap on the windshield arm and loosen the nut under the cap. Reposition the arm so that it faces 180 degrees flat to the passenger side of the car. Tighten the nut. This should solve the problem you've described.

Apr 11, 2010 | 2003 Chevrolet Venture Passanger

1 Answer

Wipers won't stop wiping.


Sounds like your intermittent wiper circuit is defective. Normally the intermittent feature is engaged by one of the functions on the multi-function switch (usually on the steering column). The circuit of the intermittent wiper periodically activates a relay that closes across the "Wiper On" switch. Your intermittent wiper circuit is likely defective and holding its relay closed (or the relay is stuck closed), thereby keeping the wipers on. Note: The wiper motor has an internal switch that opens when the wipers are in the park position and that is designerd to stop the wipers in the park position. When you turn on the wipers (or the intermittent relay is closed), the motor's internal switch is shunted such that the wiper does not stop at the park point of the cycle.

Apr 27, 2009 | Ford Explorer Cars & Trucks

1 Answer

02 audi a4 quattro wipers won't park


If you can move the wiper arms by hand then the 13mm bolt on the motor has worked loose, remove the plastic windscreen trim under the bonnet , close the bonnet , then operate the wiper motor for 1 cycle , switch off , open the bonnet , loosen the 13 mm nut on the wiper motor , push wipers down to the park position , tighten 13mm nut up , close bonnet then check wiper operation , they should now park in the correct position .

Apr 14, 2009 | 2002 Audi A4

2 Answers

Car window wipers are messed up


Take the cap covers off where the bottom of the wiper is. Lossen both bolts and adjust freely to where you want it then tighnen them up.

Jul 11, 2008 | 2000 Buick Century

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