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Windshield washer pump problem.

Discussion in 'Stock 1995 - 2001 Explorers' started by 666k9, September 3, 2009.

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    1. 666k9

      666k9 New Member

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      Hoping someone could help with this one. Have a 98 Explorer XLT (4dr/4x4/4.0)that I bought used and found the front windshield wiper washer pump line was connected into the rear washer line (it has the correct pump with two outlets) and works only with the rear pump/wiper switch). Hooked the lines up correctly, replaced the mutli-position switch (turn signal), and still still get no power to the pump using the multi-pos switch. I want to run a wire directly from the steering column wiring harness to the pump (feel I might have a broken wire somewhere) but do not know which wiring harness wire to use. Suggestions and/or or a wiring diagram??? Appreciate any help.
       
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    3. BrooklynBay

      BrooklynBay Staff Member Moderator Elite Explorer

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    4. TheJackal

      TheJackal Well-Known Member

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      Are you sure it's not the relay?
       
    5. 2000XPLORERSPORT

      2000XPLORERSPORT Active Member

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      check the relays in front of the washer reservoir.there in a black box.theres 3 relays. that was the problem with mine.
       
    6. gijoecam

      gijoecam Village Idiot Elite Explorer

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      Indeed, it sounds like the relay is likely only working in one direction.
       
    7. 666k9

      666k9 New Member

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      Checked the relays but no luck. Am trying to trace the problem through the wiring harness. Thanks for the input.
       
    8. gijoecam

      gijoecam Village Idiot Elite Explorer

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      What do you mean by 'no luck?' There are two relays to check... One for the front and one for the rear. One should get power and close when it gets a signal from the MFS and one should get a signal to close when it gets a signal from the rear wiper control button. One relay acts as the ground path for the other relay.

      Now, in your case, it sounds like someone re-plumbed the hoses to jimmy it and make it work. Not the right fix.

      You need to pull the front and rear relays and check their function, as well as check for the proper signal coming to them from the switches. It could be a multifunction switch not working (not uncommon) or a bad relay. The easiest thing to try first would be to swap the front and rear wash relays and see if the problem moves from one to the other. If so, then we know you have a bad relay. If not, then it could be a wiring issue, or it could simply be the pump gone bad in one direction (not uncommon and a $30 part IIRC)

      But telling us you 'checked' the relays doesn;t really tell us what you did...
       
    9. TheJackal

      TheJackal Well-Known Member

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      [​IMG]

      This relay box is near the air filter housing. It is not the Battery Junction Box, where the owner's manual tells you the relays are.

      Try swapping the forward and reverse relays and see if that changes anything.
       
    10. cbranje

      cbranje New Member

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      How do you open the darn relay box??
       
    11. cbranje

      cbranje New Member

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      Figured that out, now when I open the lid all I see is one black cube and a bunch of plastic slots . . .

      Thanks,

      Carmen
       
    12. cbranje

      cbranje New Member

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      Hey all, I figured out all by myself by RTFM ;)

      Turns out the relay for the pump is in the main electrical junction for my explorer sport 2001. Switched the relays and now the front works, not the back. Will order a new relay soon.
       
    13. graciebrother

      graciebrother New Member

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      I'm having a problem with my washers now too. rear seems to be working, which I assume means the pump is working? Going to check the relays this weekend and maybe swap them around.

      The pressure for the front washers has been playing up for a while and was slowly getting less and less. This week - nothing. Took the unit apart ast night and checked the pump. It comes on when pushing the interior switch /button. I also blew through the hose and they also seem clear - wonder if there could be a hole in the line?
       
    14. Millertime1987

      Millertime1987 Active Member

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      I had a similar issue. Turned out mine was corroded relays i cleaned those up with a fine sand paper and now all is working. Did this after replacing the pump mind you.
       
    15. graciebrother

      graciebrother New Member

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      Thats good to know (but bad for you!)- thanks. Will take a look at the relays. From the threads I've read, they seem to be the culprit more often than not.
       
    16. comatose1

      comatose1 New Member

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      I'm having a similar issue with my windshield washer, when I press the MFS in with normal pressure it doesn't work until I put an enormous amount of pressure on it. Is my MFS going bad?
       
    17. graciebrother

      graciebrother New Member

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      I just pulled the relays and switched them around. Back continues to wash fine buy nothing on the front washer. I also took apart the t-split which diverts to the two fron washers and tested to see if there are any blockages, nothing and no fluid got pumped through either. Looks like it the pump itself. Time to call and get a replacement. Anyone know a part number for it?

      Thanks
       
    18. fixt

      fixt Active Member

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      Check here at Rock Auto
      http://www.rockauto.com/catalog/x,carcode,1304424,parttype,8840
       
    19. graciebrother

      graciebrother New Member

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      Ah jeez, it was the relay after all and I even bought a new pump!
       
    20. Metalhead Jon

      Metalhead Jon New Member

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      I know this is an old thread, but I figured I'd ask here rather than starting a new one and duplicating information. I'm having a similar problem (1999 Explorer Sport 4X4, 4.0 SOHC), except that I don't get any washer fluid sprayed either front or rear. Initially I found a blown fuse in the panel just inside the driver's door and replaced it (I don't remember which one anymore). When that didn't solve the problem, I tested power at the pump, no power when my wife pushed the MFS. After finding the image that TheJackel posted above, I got two new relays figuring that was the problem, and swapped them in for the washer pump relays (front and rear), but still the pump didn't work. I swapped the washer pump relays with the fog lamp relays (same P/N) as a test, and the fog lights still work but I'm still getting no pump function. Is there anything I missed, or anywhere else I should check? I'm really starting to pull my hair out on this one. Any help or advice would be greatly appreciated.
       
      Last edited: December 9, 2013
    21. Metalhead Jon

      Metalhead Jon New Member

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      I still haven't been able to make the washer pump work. Anyone have any ideas on whatever I might have missed? Using a spray bottle full of windshield fluid (what I'm doing now) is really not a good solution to all the road salt and other crap that cakes on my windows after it snows.
       
    22. bobflood

      bobflood Elite Explorer

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      Since the relays didn't fix it, you need to do some troubleshooting. The washer pump gets power thru Fuse 12 in the box inside the car - verify that first. Then verify that the grounds are good - term 2 in the rear relay socket and term 4 on both front and rear relay socket should all be grounded. Then run a jumper from the battery directly to the pump to verify that the pump does indeed work. If all of these things are OK, you will need to use the schematic and test at points along the way from the switch thru the relays to the pump to determine where you are loosing power. You should have battery voltage at term 1 and 5 of the front relay socket when key is in On or Run; you should have battery voltage at term 1 and 5 of the rear relay socket when key is in On or Run AND the rear washer switch is depressed.

      Hear is a great source for wiring diagrams:
      Auto - Online Repair Info
      http://search.ebscohost.com/
      Login ID: rrcc
      Login PW: rebsco
      Select: Auto Repair Reference Center
      Fill in: Find Your Vehicle
      Follow prompts down to Wiring Diagrams.

      Good luck.
       
    23. Turdle

      Turdle Step-buddy Staff Member Moderator Elite Explorer

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      Wow, ya learn something every day! I had no idea there was actually 3 washer pump relays until I searched for and found this thread.

      Matt came home with a dead washer pump in his 98 Mountaineer. Fuse 12 was a 7.5 amp and blown. Replacing the fuse did not result in the anticipated joy, so we swapped the relay in the power distribution box.

      Still no joy.

      Then I found this thread, replaced the front pump relay and all is well. :thumbsup:
       
    24. Metalhead Jon

      Metalhead Jon New Member

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      OK, I may have just been a bit slow on this one. After replacing the #12 fuse again (which probably should have been a clue), I went throught the whole system and everything tested good up to the pump. It turns out the pump was bad. When I tested it with direct battery power it worked, but when I plugged it back into the system all it did was blow fuses. The new pump, when I put it in on a gt feeling and nothing else, worked great. Next time I test something like a washer pump with battery power, I think I will put the appropriate size fuse in between. That would have indicated the problem right away.

      Thanks for the advice and information, I really appreciate it. Had it not been for the holidays with family, friends, and the outlaws followed by a long and nasty cold and then by the ominous sounding polar vortex (apparently some people want me to believe that record cold temps are obvious proof of global warming), this would probably have been resolved multiple weeks ago. Anyway, thanks again everyone!
       

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