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Old 02-21-2009, 09:05 PM   #1 (permalink)
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Slow Wiper Troubleshoot Help

I have a '93 pickup. The wipers run very, very slow in both low and high speed. I don't have intermittent wipers. I bought and installed a rebuilt wiper motor but the problem is still there.

I need some direction on what and how to troubleshoot this.
Thanks!
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Old 02-21-2009, 11:50 PM   #2 (permalink)
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You can check to make sure that full 12 volts are getting to the wiper motor both on pin 1 (high speed) and 2 (low speed) (14 V if the motor is running), but the problem is probably binding linkage - shot bearings. You can try spraying some WD-40, but if that works it will only be very temporary - the real solution will be to disassemble the linkage (not easy) and replace/recondition the linkage bushings/bearings.

There is some troubleshooting help in the fsm. If you don't have one, google 1993 toyota pickup service manual.

If the linkage is binding, don't run the wiper motor or you'll burn it out.
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Old 02-24-2009, 04:13 PM   #3 (permalink)
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Thanks! I'll snag a multimeter and keep my fingers crossed it's something simple.

Pardon my ignorance, but what is fsm? I'm a noob to this forum.
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Old 02-24-2009, 04:29 PM   #4 (permalink)
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Sorry - I do so much typing I go for the shortcuts and hope they'll fly. FSM = Factory Service Manual.

Welcome to the forum, buy the way.
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Old 02-24-2009, 04:35 PM   #5 (permalink)
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I had the same problem. I bought 3 used motors before I finally figured out what the shit was going on.

1. The ground was not very clean, so remove it clean it till its nice and shiney, use a multi meter to converm there is no resistance

2. the linkage as mentioned, can be a problem. I have not gotten to mine yet but many have reported that it was the problem

3. wiper blades. I have these one peice flexible wiper blades, they are almost a year old. After using this wiper wipes that claim to make your blades like new, I had no problems! But its wearing offf.
So if your blades are more then 6months old, replace em...
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Old 02-24-2009, 06:18 PM   #6 (permalink)
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please pardon my ignorance as well if i'm wrong,

but could a bad fuse be the culprit?

i'd check the fuse...
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Old 02-24-2009, 07:43 PM   #7 (permalink)
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Im not sure a fuse would cause a problem like that. If the fuse popped it wouldnt work. But the wiring could be an issue (old... increase resistance).

Conferm you are getting 12v to the plug (I get like 11.4v) and go from there...
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Old 02-26-2009, 09:21 PM   #8 (permalink)
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I tried getting a voltage reading and ended up getting some...confusing results. When I put the probes on any two of the "a" sides of the connector I got nothing. "a" to "b" or "a" to ground gave me 11.4V just like you Jayota. Same result for low speed and high speed.

I expected to get a voltage reading when touching two of the "a" sides, am I wrong? Can someone walk me through this with more detail please? My Chilton manual didn't offer much troubleshooting detail.

Oh yeah, that crud on the connector is not dirt, it appears to be some sort of dielectric grease that someone put in before I got to it. I dug some out and put it on the multimeter probes to be sure it was conductive.

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Old 02-26-2009, 11:34 PM   #9 (permalink)
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The top two terminals, which you marked 1 and 2, are the slow and fast speed terminals (or the fast and slow - the fsm isn't real clear). Anyway, doesn't matter; there should be very close to battery voltage coming from one or the other depending on whether the wiper switch is on high or low. There isn't less voltage for low - it's the full volts. The ground side is not one of the wires in the connector but instead the body of the wiper motor is supposed to provide the ground. That's a possible source of corrosion and poor electrical connection.

It's strange that you are only getting 11.4 volts when you tested terminal to ground: what was the ground you were using? From the wiring diagram in the fsm, I can't see why you wouldn't be getting very close to battery voltage on that terminal. Unless the wiper switch has a resistor in the circuit, which seems very unlikely.

You could try a jumper cable between the neg bat post and the body of the wiper motor and see if your wipers speed up. If they do, you'll need to clean the bolts or rig a stout ground wire to the wiper motor body.

I don't know how easy it would be to detach the linkage from the wiper motor arm, but if you can do that, you'll be able to see how much resistance there is in the linkage. Make the disconnection at the end of the motor arm, not at the motor shaft, if possible. (I haven't worked on mine so I don't know how it attaches.) You want to avoid disconnecting at the motor shaft because basically you don't want to pull any splines apart (if it has any) without first making a clear match mark: wiper motor park positions are usually VERY fussy and particular. In fact if you get the position messed up, usually it's a real bitch to get it back into the right position.

If you don't have an fsm, google 1993 toyota pickup service manual and check the section BODY ELECTRICAL - WIPER AND WASHER SYSTEM for more details and troubleshooting help.

Good luck! As the owner of a 20 year old toyota wiper motor, I'll be very curious to learn what you find...
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Old 02-27-2009, 01:15 AM   #10 (permalink)
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Haha! Getting the splines matched up is a real pain!

Also, as per the FSM I applied power directly from the bat to the wiper motor and observed almost no difference....

I also ran a ground to the battery aswell, no change.

I think the linkage plays a part in this.... I just havnt gotten that far in there before.
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Old 02-27-2009, 07:55 PM   #11 (permalink)
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Thanks for the help. I'll take a look this weekend and let you know what I find.
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Old 02-28-2009, 02:49 PM   #12 (permalink)
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Here's what I found:
Battery voltage: 11.7

Plug #1, wiper motor bolt ground: 11.2
Plug #1, battery ground: 11.5

Plug #2 same results.

Before I open the hornet nest of fixing wiper linkage I want to make sure I really have a problem. I never thought the wipers were slow until I bought a newer car. Below is a video of my truck, let me know how it compares to a similar one. Please forgive the squeeling wipers on dry glass, might want to turn your sound down.

http://www.youtube.com/watch?v=mutYgZ0M52w
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Old 02-28-2009, 08:18 PM   #13 (permalink)
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Thats defantly too slow. Try running a wire directly from the battery to the wiper motor. If it goes faster then you know you have a problem with your power wiring.

Im assuming it goes faster when the windsheild is wet?
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Old 03-05-2009, 07:15 PM   #14 (permalink)
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It looks like the same speed when the windshield is wet.
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Old 03-07-2009, 11:00 PM   #15 (permalink)
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Did you try running a power wire directly from the bat to the motor?
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