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How can you tell if your wiper relay is bad - 1997 Volkswagen Jetta

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As a very first thing, check your wiper motor fuse. If it's blown nothing will work.

For the relay, in most cases you'll be looking for a "sometimes they work, sometimes they don't work" type of pattern. Maybe weather will be part of the issue like high humidity causes them not to work or work very erratically. So try testing the wipers in all sorts of weather, not just when it's raining. If they give you trouble when it's humid, look at the relay casing, it may have a crack or a 'shorting' issue. Sometimes you can easily fix a relay yourself:
If the outer contact points look rusty, try sanding them down a bit.

And lastly, when they last worked or do work, do the wipers move across the windshield 'strongly' or weak-type of action that looks like they could quit in the middle of the cycle? If it moves 'strongly' start assuming it's the relay. If it's weak, signs are pointing more towards a tired/faulty motor or arm mechanism.

Hope that helps.

Posted on Mar 18, 2014


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Hi - I have 1 2008 Acura MDX and suddenly the wipers came on and won't shut off. (Stuck in intermitten mode.) Also the HIGH speed option for the wipers also isn't working - it just stays on standard speed....

Front wipers.
they all guess, do you want me to guess, too? surely not.
or test?. we can use a voltmeter to find this.
what we do is look at the schematics at
and its all clear. a simple road map;

Sticking on possibles.
the fuses are underhood. fuse 11 and 31
bad motor , internal keep alive cam switch stuck on,
will cause continuous wiper.s

so will motor colored wires green or blue hot full time
will keep motor going full time (any voltmeter, easy check)
12vdc is bad, 0v good (wipers off)
next and last is that wiper relay in hood fuse box, shorted. (pull it out see if they shut off?)
if the relay is good then its input is wrong. the control block.

the combo switch wipers on , sends a CAN buss digital commands to the MICU control block, this i turn powers up the wiper relay.
the MICU has a diagnostic port,and can be tested at the dealer
or errors.

if the relay coil pins are hot all the time, then the MICU /combo side is failing, if not, the problem is the relay ,if its output is hot all the time.
how is that?

Oct 22, 2013 | Acura MDX Cars & Trucks

1 Answer

2005 Jeep Grand Cherokee font wiper problems. wipers will not park all of the time. when you start Jeep or shut off vehicle, wipers will cycle once. switch is in the off position. dealer replaced wiper...

both blades fail to park.?
are the arms installed correctly?
so the wipers run , when you key on. ? is that it
tell me when exactly they move, and you didnt commend it.
here is how i do this, i log in to
and see its a complex set of 5 parts, in the wiper schematic
2 relays (on/off and hi./low) and the wiper motor and the switch
and the controller.
so i take my handy voltmeter ($10 at walfart) and measure
pin 30 of the wiper relay on/off.
if it reads 12vdc (keyon, or off, with wipers off) this is a bad reading
if it reads 0v, , its good. easy huh
but what if the relay 30 pin read 12v
what would i do, id see if its being told to turn on.
id pull it out, is the wiper dead now. (yes, might be bad relay)
but id check the voltage across the 85/86 relay coil pins
12v is bad, the IPM is commanding wipers full time. (keyon)
0v is good, and relay is TOAST>

The IPM is the thing that holds the wiper switch.
it too can fail but i bet not.

Aug 28, 2013 | 2004 Jeep Grand Cherokee

1 Answer

Rear wiper doesn't work

check rear wiper fuse and relay.if wiper motor getting power but do not work.rear wiper motor bad.if fuse and relay okay but no power going to rear wiper rear wiper switch could be bad.

May 14, 2013 | 2000 Seat Ibiza

1 Answer

Wipers not turning off dealer said main fuse box is bad. How fard to replace

i dont see the main fuse box being bad, a fuse box does not tell the wipers to turn on or off. Are you sure they said fuse box.? I would check a wiper relay or the control switch on the column. the fuse box only gives the power to switch,

Feb 08, 2011 | 2007 GMC Yukon Denali

1 Answer

Windshield wipers don't work.Fuse is good and motor is good.No power to motor. The tag to tell what relay is for what is missing. Was wondering if the wipers had a relay and which one it is.

Hello Firerocker.
If your washer motor works there is power in the circuit and ground.
The wiper motor housing needs to be grounded.
If neither one works check for power on the green wire leading into the motor. If nothing there your switch may be bad.
If there is power to the green wire then check for power on the gray wire on low wiper speed and power on purple on high speed.
Here is a diagram if you need it.

Hope this gets your wipers going again.


Feb 12, 2010 | 1992 Buick LeSabre

1 Answer

Windshield wipers on pt cruiser

the pump wire is probably not making good connection with the pump that is why the washer fluid wont work try and clean the connection. the pump is located under the fill tank

check for a bad relay for the wipers not working. the relay will be under the hood or under the dash next to the fuses. the cover will tell you what piece is the relay. the relay controls the delay in the wipers so that is probably bad and you can get them at napa for cheap. and simple to install its just like a fuse.

Mar 28, 2009 | 2006 Chrysler PT Cruiser

2 Answers

The windshield wipers do not work on my Jaguar XJR 2002. Could be the fuse but i do not know which fuse it is as i do not have an owners manual. Maybe the motor is bad, but I wanted to check the fuse...

I have a 1999 XJ8. Same setup as yours, with very minor differences. I had the same problem, turned out NOT to be fuse, OR bad relays, OR wiper motor, OR Body Processor Module. It was simply a loose connection at the body processor module below the Glovebox. I Literally jiggled the wires, and it started working again, and has been ever since. I have the Shop Manual, Technical ability, and Tools available to test all of the circuits involved, and went forth with printing out the wiring diagrams, and step by step eliminated each, until I decided to give the connection a jiggle, JUST BEFORE replacing the Body Processor Module (which would have been expensive)

Test 1:
Try the jiggle trick. Should be able to access harness just below, and behind the left of the glovebox. touch around up there, but don't be a brute, as you MAY break stuff.

Test 2:
Check Fuse under hood, (#22) Should be a 30A fuse

Test 3:
Swap the relays located on the drivers side, just behind the radiator. One is for Wiper motor run, the other is for wiper motor high speed.

Test 4: Jumper Pin 3 & 5 on the LEFT relay (drivers left) (please remove relay first). This should turn the wipers on, regardless of whether or not the computer is telling it to run. If wiper does not turn on, check fuse, or replace wiper motor.

That's all I've got.... Hopefully this works for you.

Feb 22, 2009 | 2004 Jaguar XJR-Series

1 Answer


You may have some short circuits in your wiring, a bad horn relay or horn unit, and/or a bad wiper motor. Hard to tell without actually looking at it.
Try this:
Disconnect the horn, and try another fuse. Does it blow? If not, the horn is shorted, and needs replaced. If it blows, remove the horn relay & try another fuse. Same with the wiper motor, unplug it and try another fuse. If it does not blow, you need a wiper motor.

Sep 26, 2008 | 1985 Toyota 4Runner

1 Answer

Winshield wipers not working

All the relays for the wipers are on the motor under that black cover. could be the multifunction lever switch on the left hand side of the steering collumn is bad, the yellow wire would break and no wiper operation. you can remove the little cover behind the turn signal lever and check the wiring(especially the yellow one). also try pushing on the wiper motor cover to see if it comes on. if not try probing a test light in the back of the connector on the motor while hooked to ground and this should trigger the motor to come on in different speeds if the key is on.
Good luck

Aug 28, 2008 | 1991 Buick Park Avenue

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