Question about Mercury Grand Marquis

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My 2010 grand marquis wipers stopped working on high now they are coming on while in the off position. What could be wrong?

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Could be the wiper switch. There are few components in the system. The wiper switch is rarely disassembled to repair, it is meant to be replaced.

The wiper motor would usually fail differently. Not shutting off (called parking) is a motor problem. But not engaging high speed is usually a switch problem. It sounds like the switch is a notch off inside and is not touching to cycle off.

There may be some you tube videos which show better details than just texting about this.

Posted on Apr 22, 2017

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Posted on Jan 02, 2017

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Feb 09, 2016 | Cars & Trucks

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What part do I need & how do I fix?


I have a 95 grand marquis and i had the same problem. I fixed mine myself by replacing the wiper motor. The problem was the motor will still work on high but not low. Its an enternal issue on the motor that wont allow it to fully rotate when shut off and its not accepting the low voltage to run on low. My answer is 100% accurate

Oct 09, 2014 | 1995 Mercury Grand Marquis

1 Answer

1997 mercury grand marquis wipers


We have the same problem on our 97 Grand Marquis. We have replaced the wiper blades and the drivers wiper arm with a used one. The problem was not completely solved but it did work better. We are going to replace the arm with a new one and see if that works better.

Oct 25, 2011 | 1997 Mercury Grand Marquis

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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zjlimited_176.gif


Hope this helps.

Feb 08, 2011 | 1993 Mercury Grand Marquis

2 Answers

Wiper speed control for a '97 Mercury Grand Marquis. What causes the wiper to work on high speed only?


Intermittent wiper control stopped working on my 1996 GM last spring. I ended up replacing the wiper motor ($100.00 part). Since I have found it on Amazon for $58 including shipping. It works fine now. Only bad part was all the "stuff" that has to come out (like dead leaves!) to get to the wiper motor. Also make sure you have your wipers in the down position when you replace the motor.
Hutch50

Sep 28, 2009 | 1997 Mercury Grand Marquis

1 Answer

I have a 2005 Mercury Grand Marquis and I can't turn the wipers.


this is a very common problem on these vehicles. the wiper motor has a park switch built into it that fails. replace the wiper motor and this will stop problem. hope this info helps you!

Sep 22, 2009 | 2005 Mercury Grand Marquis

1 Answer

Wiper blades act on their own


It is possible the wiper module is shorting out. Im not certian of the price but someone that knows how to do it can do it in about an hour.

Dec 15, 2008 | 2003 Mercury Grand Marquis

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