1994T sedan 108K

The wife reported the following behavior and I would like help trouble shooting.

Driving with windshield wipers on lower setting and they stopped intermittently. Changed to high speed and got the same intermittent action stopping mid cycle in various position but not "parking".

Did some of the same when she went to the intermittent setting as well as the wash pull.

I see where the intermittent relay is in the tray but don't know where the normal operation wiper relay is located.

Any suggestions with relay location or solutions based on the behavior?

Thanks

Hiya Mr. Starkie and Mr. Spook,

Using your web browser, please navigate here:

http://www.v8volvo.se/mekartips/volvo/index.html

Click 940. You will see the 1994 940 wiring diagrams as the Mitchell (Volvo 940 1994 Michell.pdf) line art diagrams and the 1994 940 factory green manual (Volvo Gröna 940 1994.pdf) for the electrics.

The intermittent wiper relay engages when the front wiper stalk or, on wagon, the rear liftgate wiper switch, is set to intermittent wipe. On low or high speed wipe, the intermittent wiper relay does not comprise the activated circuit. From the switch to the wiper motor.

In prior posts by our Uncle Art, issues with not being able to park were in a set of contacts in the wiper motor gear box. Also, there could be issue with fraying wire connections that bend with each wiper stalk actuation. Or the copper contacts in the wiper stalk.

Yet the 940 wire harness is much more complicated than 240. So, I'm unsure. Yet Spook is more certain in finding the root cause and remediation.

So, here is Uncle Art's cleanflametrap article about 240 wiper issues with the motor. There exist many threads on the issue one can find with the search feature here. Maybe corrosion at a bonded contact like the

http://cleanflametrap.com/wiper.html

The wiper - gearbox assembly for your 940 Mr. Starkie I guess is Volvo 3518120 and is NLA from Volvo.

https://www.tascaparts.com/oem-parts/volvo-wiper-motor-3518120

Hope that helps you. Thank you.

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Thanks, I'll have a look at the information.

Dear rstarkie,

Hope you're well. Based on Volvo VADIS diagrams, 940 Sedans have a single windshield wiper intermittent relay; wagons have two.

The windshield intermittent relay is "C". This is third from the right as you face the relay panel, in the row closest to the firewall. The next position - if it is a sedan - should be "empty". On a wagon, that has the intermittent relay for the rear window wiper.

Because the problem arises when the wipers are supposed to operate continuously, I suspect the switch - on the steering column - may be "on the way out".

It is also possible that the ground contact needs cleaning.

Hope this helps.

Yours faithfully,

Spook

Dear rstarkie,

Hope you're well. The sedan's intermittent wiper relay is third from the left (not "right" as I mis-stated) on the relay panel, row closest to the firewall.

I regret - and apologize for - my error.

Yours faithfully,

Spook

Thanks Spook.

So is the intermittent replay tasked with routing all the power to the wiper motor or just the intermittent function?

Randy

Are the wiper arm shaft nuts tight?

Yes, thanks, they are tight.

Randy