Why won`t my wipers won`t work after replacing switch and wiper motor?

Asked by Jul 20, 2013 at 02:59 PM about the 2007 Mercury Grand Marquis LS Premium

Question type: Maintenance & Repair

While driving last year my wipers came on by themselves in the delay mode (the wiper switch was off)..  Called a local mechanic and told him of my problem and he said could be a ground problem or switch to him. I had already checked fuses and wiring connector to wiper motor and still had same problem, I added a ground wire to wiper motor and then purchased a new wiper switch and same result (wipers ran with switch turned off).. The car was sitting outside in driveway one night and smoke started come out from under hood, popped hood and saw that smoke was coming from wiper motor. Used fire extinguisher to put small fire out from wiper motor area, the fire melted the wiring harness to the motor.. After purchasing a wiper motor repair pigtail and wiring it in to burnt one and purchasing a remanufactured wiper motor when I turn on switch all I hear is a click from wiper motor ( wiper motor has a printed circuit board to make the delay function work as well as slow and fast motions.. I have checked all fuses that I know for wipers.. I`m not sure where wiper relay is located to check to see if that is my problem.. This has me really stumped, looking for a answer to my problem.

15 Answers


Normal Operation The windshield wiper motor receives battery voltage from the battery junction box (BJB) through circuit 2025 (RD/YE), and voltage from the central junction box (CJB) through circuit 65 (DG) when the ignition switch is in the RUN or ACC position. The windshield wiper motor is grounded through circuit 676 (PK/OG) and circuit 57 (BK). The windshield wiper motor receives switched ground signals from the multi-function switch through circuits 56 (DB/OG), 58 (WH), 61 (YE/RD), and 63 (RD). When a wiper function is selected, the multi-function switch grounds 1 of several combinations of these 4 circuits. The windshield wiper motor interprets these ground signals and performs the action requested. The multi-function switch is grounded through circuit 57 (BK). Possible Causes Fuse(s) Circuit 56 (DB/OG) open Circuit 57 (BK) open Circuit 58 (WH) open Circuit 61 (YE/RD) open Circuit 63 (RD) open Circuit 65 (DG) open or short to ground Circuit 676 (PK/OG) open Circuit 2025 (RD/YE) open or short to ground Multi-function switch Windshield wiper motor

5 of 5 people found this helpful.

Thanks Tracy for the information, I`ll need to get a wiring diagram to check those circuits.. I don`t have a owner manual for this car do you know what website I can go to and possibly download it and the location of the wiper relay in the battery junction box.


I'm sorry. I don't.

1 of 1 people found this helpful.

the wiper motor you got might be defective.I had the same issue and I received a defective rebuilt Wiper motor from advanced auto parts and it also had fixed the 1st issue which was my wiper running in delay mode while the switch was off.I got the rebuilt Wiper motor and next thing I knew the window wash pump would not come on.took my old wiper motor and plunged it in a next thing you know my washer worked.The rebuilt wiper motor was bad from day 1.

2 of 2 people found this helpful.

Yeah, most of the retailers ship stuff off to 3rd world countries to be rebuilt by people that rarely ever even get to sit in a car - let alone drive one. Sucks.


Yeah,Tell me about it.I blame myself for not checking all the functions out beforehand not just that my wipers action and delay was working.The real issue was the motor going on in delay mode while the wiper switch was off but that ended when the rebuilt motor was replaced,Bad for me that I did not check the window washer operation of the rebuilt not just motor operation, I did not check operation of washer motor relay inside the wiper motor ,I will not make this mistake again. As we all know we learn something everyday.Sometimes easy and sometimes not.Issue is resolved now and maybe this might help someone down the line about the issue I had with wipers coming on while off,If you remember the first thing I an I think most would have jumped to think it had been the multifunction switch which in most cases might have been correct ,Remember there is no one fix all.

1 of 1 people found this helpful.


thanks john, you are right. i had the same problem and the same results' tried another motor and the washer works. the people swear that the wipers don't affect the washer and try to sell you a washer motor but there wrong and don't bite the bait. the wiper and the washer are somehow related.

and tracy, TMI....keep it simple for stupid people like me...haha, just playing. thanks for all that information I'm sure someone will benefit from it somehow

seems as if most of the "rebuilt" wiper motors will have a defaut. next vehicle i will try to purchase a "new" one


I already changed the fuses and motor for the wipers for my mercury grand marquis 2003 and its still not working. Can someone help me out. I will appreciate your help.

6 of 6 people found this helpful.

So bottom line what is causing the "ghost wipers"? I have looked for a relay in the distribution box under the hood and all I see are more fuses and breakers. To me it is acting like a sticky relay seems like a bump in the sets mine off..


Either a short in the wiring: an open in the wiring: a defective wiper motor (most likely), or a bad switch No easy answer here

So I replaced the multifunction switch all to no avail. Still have the same symptoms wipers run full on or not at all. And no washer. Next I guess I will try the replacing the motor. The parts guy said there is a also a "pulse forward" assembly. Any idea what that is or where it is?


Never heard of a "pulse forward" anything. Hell, I don't even know a parts guy worth a damn any more.

Your Answer

Add photo

Related Questions

  • how to test the windshield wiper motor in 2003 mercury grand marquis LS 5 answers

    just replaced motor, wipers stopped working

    2003 Mercury Grand Marquis LS Ultimate


    Maintenance & Repair

  • Windshield wipers 37 answers

    My wipers stopped last week and the next day they started working okay and today they don't work on slow or intermitt and only work on high speed and the washer wiper doesn;t work

    2004 Mercury Grand Marquis LS Ultimate


    Maintenance & Repair

  • Wiper blades 3 answers

    My car's wiper blades hadn't been working for about a year now. We have replaced the motor twice, and both times the motors burned up. This time, we replaced the motor, wires that were melted, the...

    1993 Mercury Grand Marquis 4 Dr GS Sedan


    Maintenance & Repair

  • Wipers 1 answer

    My wipers will not turn off, please help

    2003 Mercury Grand Marquis LS Premium


    Maintenance & Repair

  • Why don't my wipers work when I turn them on? 1 answer

    I changed the motor and replaced the wiper switch

    2004 Pontiac Grand Prix GT1


    Maintenance & Repair

Grand Marquis

Looking for a Used Grand Marquis in your area?

CarGurus has 1,804 nationwide Grand Marquis listings starting at $2,250.


Search Mercury Grand Marquis Questions

Mercury Grand Marquis Experts

#1 Tracy Hooks
Tracy Hooks
Reputation 5,470
#2 kbro
Reputation 2,060
#3 Js08016
Reputation 1,770
View All

Related Models For Sale

Used Ford Crown Victoria
12 Great Deals out of 1,069 listings starting at $2,995
Used Lincoln Town Car
33 Great Deals out of 1,820 listings starting at $1,750
Used Chevrolet Impala
521 Great Deals out of 31,726 listings starting at $1,450
Used Ford Mustang
470 Great Deals out of 45,735 listings starting at $1,999
Used Dodge Charger
405 Great Deals out of 28,172 listings starting at $1,988
Used Ford Taurus
249 Great Deals out of 20,434 listings starting at $699
Used Ford F-150
2,194 Great Deals out of 206,316 listings starting at $1,499
Used Chevrolet Tahoe
547 Great Deals out of 29,234 listings starting at $1,699
Used Cadillac DTS
58 Great Deals out of 1,630 listings starting at $1,995
Used Chrysler 300
413 Great Deals out of 19,932 listings starting at $1,000
Used Chevrolet Silverado 1500
1,717 Great Deals out of 175,751 listings starting at $1,250
Used Buick LaCrosse
226 Great Deals out of 21,522 listings starting at $1,100

Used Cars For Sale

2007 Mercury Grand Marquis LS Premium For Sale
3 Great Deals out of 97 listings starting at $2,495

Content submitted by Users is not endorsed by CarGurus, does not express the opinions of CarGurus, and should not be considered reviewed, screened, or approved by CarGurus. Please refer to CarGurus Terms of Use.