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Fault with windscreen wipers


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#1 burty

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Posted 12 June 2019 - 06:11 PM

I have a UC torana that has an intermittent fault with the wipers. They still work as designed however they randomly activate and move 1/4 to 1/2 way up the windscreen.
Have checked other forums and haven't come across the same issue.
Any suggestions would be welcome.

#2 Rockoz

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Posted 12 June 2019 - 09:13 PM

Possibly a faulty switch.
Hard to imagine 2 seperate opposite type faults happening anywhere else.

Needs a short somewhere across switch contacts to get them to move.

Then an open circuit to take away the supply that gets them to self park.

Does it have a intermiittent wipers?

Possibly internal to motor as well.

See how easy it is to remove the electrical cover off the wiper motor and look for broken bits in there

Intermittent faults can take hours and even days to track down

Check all your earths as well. Behind the dash and around the motor.

Will grab a diagram tomorrow if I have time and see if I can narrow it down a bit more



#3 burty

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Posted 12 June 2019 - 09:38 PM

Thanks for the advice, gives me a couple of places to start. The wipers don't have intermittent just off, 1 & 2 speed.
I'll check the motor first as the cover is accessible.

#4 VDO

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Posted 13 June 2019 - 09:26 AM

It will most likely be in the switch.

 

There's nothing in the motor that would cause the random movement.



#5 burty

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Posted 17 June 2019 - 05:42 AM

Rare spares have replacement indicator, wiper dip switch stem/lever and wiring for about $65 will give that a go first.

#6 burty

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Posted 22 June 2019 - 07:41 AM

Replaced the switch, unfortunately hasn't fixed the problem so I'll have to try something else. The new switch was worth a shot & not very expensive and I now have a spare!!
Maybe a wiper motor problem? Or it only leaves the wiring from the switch plug to the motor.

#7 Rockoz

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Posted 22 June 2019 - 10:57 AM

Remove the cover on the wiper motor.

The motor works on negative switching from memory.

Any debris in the area where the contacts are could cause the issue.

But get the torch out, become a contortionist, and have a good look at the harness from the switch through to the motor.

Sometimes there will be obvious signs, sometimes not.

But if someone has spliced into the wiring, like fitting an after market intermittent control.

Wiring could have been attacked for any number of reasons over the years that could cause dramas.

 

I usually pull all extra wiring out of any car I buy, and start again doing it properly.

Have seen "professional" radio installers just twist and tape connections a lot of times over the years.



#8 burty

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Posted 22 June 2019 - 06:35 PM

Thanks for the advice I'll check the wiper motor next.
When I purchased the car I drove it for a year before taking it off the road for another 7. The year I drove it it never had this issue. Just have to keep eliminating bit by bit.

#9 Rockoz

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Posted 23 June 2019 - 10:54 AM

Thanks for the advice I'll check the wiper motor next.
When I purchased the car I drove it for a year before taking it off the road for another 7. The year I drove it it never had this issue. Just have to keep eliminating bit by bit.

 

 

Thats the way fault finding works. Eliminate then move on.

Being intermittent makes it harder to pin down.

 

I used to Kodak a lot of intermittent problems years ago.



#10 burty

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Posted 23 June 2019 - 03:50 PM

Yep, hopefully I'll find the fault eventually and put it on this thread for others to use in future.




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