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post #1 of (permalink) Old 02-13-2011, 05:34 PM Thread Starter
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2002 Impala wiper problem


We had a winter storm last week, and my wife's wipers have been out of whack ever since. They now stop in the up position when turned off. (Up position = straight up vertical.) Otherwise, they seem to work fine. On intermittent mode, they stop in the down position between wipes. But when turned off, they go all the way (or nearly all the way) up and stop.

I tore into them, but don't see anything that looks abnormal. No bent rods or stripped posts.

Here's a pic of the motor in the down position. When they cycle, the motor turns clockwise as shown.

Here's a pic of them in the off/up position. When turned off, the motor makes a ~half turn counter-clockwise and stops in the position shown.

So, what is wrong? Is this mechanical? I don't see anything that would indicate that, but if so, I'm hoping someone might see something in the pics. I did notice, upon turning the torx screw, that the cam can be turned separate from the crank.

Or is it electrical? Is it in the wiper motor? Or elsewhere? Body computer? (That's the source of most problems with this model ) My first instinct was that the home switch had somehow gotten rotated out of position, but if that was the case, they wouldn't stop in the correct down position in intermittent mode.

Before I pull everything out of the car (to get the motor underneath) I hope to get enough input here to know if I'm even looking in the right spot.



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post #2 of (permalink) Old 02-17-2011, 03:30 PM
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Follow the link and send pictures Good luck I got to do the same on a 2005 this weekend.
2005 Impala Wipers Stuck - Chevrolet Forum - Chevy Enthusiasts Forums
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post #3 of (permalink) Old 02-17-2011, 03:54 PM
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Hey here a second link seems to a little more clear.You have bent or broken the "park tab" on the [COLOR=#739912 !important][COLOR=#739912 !important]windshield [COLOR=#739912 !important]wiper[/COLOR][/COLOR][/COLOR] motor bracket. The correct way to fix this is to remove the wiper arms, wiper linkage and wiper motor from the wiper motor bracket, and install a new bracket.
I just bent the tab back into place a couple times for our daughters 2005 Impala but it kept getting bent down again when they didn't take the time to make sure the wipers were not frozen to the windshield, or tried running the wipers to remove heavy snow on the windshield. So yesterday I fabricated a small piece of metal and bolted that to the bracket in the same place the tab stop was.
If someone wants to access this bracket and tab-
1. Use a inch or 13mm socket & ratchet or wrench to remove nuts on wiper arms.
2. They may make a special tool to remove the arms, I used a screwdriver and hammer to tap bottom of the arm to wedge them apart from the spindle.
3. Two small button-looking clips hold the drivers side cowl cover in place under the windshield. These are two-piece clips, pry up the center, than the outer piece.
4. Unclip the washer hose from cowl cover, than pull out plastic cover.
5. There is a smaller plastic cover with on plastic button head holding that cover in place. Gently pry under that clip to remove that cover.
6. Now you can see the wiper trans and bracket. You should see a small tab on that bracket that looks pushed down and bent or possible a square small hole with some torn off metal where the tab broke off.
7. Remove small plastic cover over the wiper transmission and you can see a small spring-loaded arm underneath the wiper transmission assembly.
8. You need to find something to pry that tab back up so when the wipers are running that spring loaded little arm just snaps past the tab running clockwise. It’s when you shut off the wipers that the wiper transmission assembly reverses rotation counter clockwise and the small spring loaded arm underneath hits that tab stop, than the wipers will go all the way down and shut off as they should.
Once that tab stop gets bent out of the way the little spring loaded arm has nothing to stop the wiper transmission assembly so it keeps traveling counter clockwise until some other stop shuts the wipers off straight up on the windshield.

There is a revised bracket part # which is supposed to be more durable, GM part #12368639. Here is a copy of the TSB which points out this problem:
Bulletin No.: 05-08-43-003A
Date: March 10, 2005
Windshield Wipers Park in Up Position (Replace Windshield Wiper Motor Bracket)
2005 Chevrolet Impala, Monte Carlo
This bulletin is being revised to make a correction to the Parts Information. Please discard Corporate Bulletin Number 05-08-43-003 (Section 08-Body and Accessories).

Some customers may comment that the windshield wipers park in the out wipe (vertical) position.
This condition may be caused by a bent park tab on the windshield wiper motor bracket.

To correct this condition, replace the wiper motor bracket. It will be necessary to transfer the following parts listed below to the new bracket.
^ Wiper transmission
^ Wiper motor crank arm
^ Wiper motor
1. Remove the windshield wiper motor drive system module.
2. Remove the windshield wiper transmission from the windshield wiper motor bracket.
3. Remove the wiper motor crank arm from the windshield wiper motor.
4. Remove the windshield wiper motor from the bracket.
5. Install the windshield wiper motor to the new bracket.
6. Install the wiper motor crank arm to the windshield wiper motor.
7. Install the windshield wiper transmission to the windshield wiper motor bracket.
8. Install the windshield wiper motor drive system module.

A TSB is not a recall, if vehicle is still under warranty the dealer should be repaired for free. If not, you'll have to pay for the repairs.
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post #4 of (permalink) Old 02-19-2011, 04:13 PM
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I fixed mine today.If you look at your first picture,the stop tab is bent down.In the empty space of the circle you drew there is a phillips head screw.If the screw is the center then at 7 o clock you can see the tab.Under the wheel there is a spring loaded piece of metal with a notch in it .The notch hits the tab and parks the wiper or sends it back.I grabbed the tab with Vice grips and used a brake adjusting bar to pry it straight up.You might have to bend it back down so its lower than the gear but catchs the sring loaded fork.If you raise it higher than the gear,the gear will bend it back down as soon as it comes around.
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post #5 of (permalink) Old 04-13-2014, 04:34 PM
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Happened to me this winter. I took the OP's original picture and circled the park tab. Mine was bent back a little bit. I just took a hammer and a chisel and tapped it back into place.
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