2019 VNL Wiper problem

Olpnm · Aug 26, 2019

I have a 2019 860, same or very similar issue on wipers, originally they were going to change controller, but they found a service bulletin that advised a jumper harness, part was ordered 2 months ago, still waiting

Mudman78 · Aug 26, 2019

Intermittent wiper control is built into the wiper motor. It needs a new wiper motor. Had two 2019's do it already. Probably a bad batch of motors on the assembly line.

Olpnm · Sep 9, 2019

Volvo part # is 23522546, it's a wire harness with a resistor inline, goes between existing harness and wiper motor, 90 bucks, fixed mine

SergeyN · Apr 23, 2020

the harness does not solve the problem completely, better immediately replace the motor assembly
and I also want to advise - the new Volvo is very sensitive to power surges and weak batteries

Nascar_Perry · Apr 29, 2020

Well to those saying its the motor, I can say no.

First, you can hear the relay in the dash click when intermittent goes up and down. There are two same relays there. If I swap their places, the problem stops for a little bit then happens again.

Ive had the motor replaced three times. The third time, it was replaced at the end of January, problem happened again in mid February and has not let up when the wipers are being thoroughly used. Confirmed it is a brand new motor that was placed in January. I am highly suspect of the relays or even as others put it, the harness or resistor.

Volvo has even acknowledged that there were problems with the relays in previous trucks when they first thought it was the motor.

It's like diagnosing an illness, you start with the most suspected area first, this case one would think that the motor would be the problem as it is actually moving the wipers. This hasn't fixed it, so now you have to continue looking until you find what is really doing it.

Rgqban · Jul 20, 2022

Nascar_Perry said: ↑

Well to those saying its the motor, I can say no.

First, you can hear the relay in the dash click when intermittent goes up and down. There are two same relays there. If I swap their places, the problem stops for a little bit then happens again.

Ive had the motor replaced three times. The third time, it was replaced at the end of January, problem happened again in mid February and has not let up when the wipers are being thoroughly used. Confirmed it is a brand new motor that was placed in January. I am highly suspect of the relays or even as others put it, the harness or resistor.

Volvo has even acknowledged that there were problems with the relays in previous trucks when they first thought it was the motor.

It's like diagnosing an illness, you start with the most suspected area first, this case one would think that the motor would be the problem as it is actually moving the wipers. This hasn't fixed it, so now you have to continue looking until you find what is really doing it.
Click to expand...

~~~]}>> Hey driver. What did you found out about the wipers problem?? I’m having the same issue on a 2020 vnl 860 and I will appreciate your help if possible. Have a nice day. Thanks

SebTheCoffeeMaker · Nov 22, 2023

Nascar_Perry said: ↑

I am going to try to detail as best as possible what the problem is and what I have done so far in the hopes someone may have an idea what is going on. Essentially I am tying to avoid having to deal with the dealership for downtime reasons and hope this is a simple issue I can fix.

The truck is a 2019 Volvo VNL 760

When using the wipers, all functions work great, intermittent, slow and fast. However when you leave them on for a few hours in slow or fast and then try to use intermittent, the start, stop, start stop, randomly. On the first intermittent pass, the wiper could go up 3/4 of the way and stop for a fraction of a second before going all the way up. It may then stop all the way up for up to 2 minutes, or it may not, on the way down it may randomly stop at random angles before returning to parked. On the second intermittent pass, this issue may not happen as bad, and may randomly stop once or twice. The whole process is random. My wiper switch was replaced for another issue so I know this is not the problem. Other drivers are reporting the same issue to the exact detail. One had his motors looked at and replaced, no change.

Myself, when the wipers act like this I will hear the relays clicking for every time it starts and stops going up or down. So I could hear the relay go nuts if the wipers start/stop multiple times. In the dash fuse, I located relay 23 and 24 which are identical relays marked as INTERMITTENT WIPER. I swapped their positions with each other and the issue went away... for a while until the wipers were used again for an hour.

Need suggestions on what to look at or if this is a case of a useless relay.

I forgot to add, the only other way to get the intermittent setting to work is to shut the truck off completely and let her rest for a day. (Could be less, but I usually have a day)
Click to expand...

Same here also VNL760 2019 it must be the relay…

SebTheCoffeeMaker · Nov 23, 2023

Phantaztix said: ↑

I've had the same problem on my current 2019 740 and I had the same problem on a 2015 670. It's some stupid #### in Volvo's relays. Maybe the computer. But this isn't a new problem with Volvos. I'm thinking it's the relay because it happens after getting warm from use and takes hours of being off before it stops the stupid glitch.
Click to expand...

I totally agree it’s 100% overheating relay…I’m gonna buy this : https://a.co/d/fYLW3QV and see if it fix it… Heat dissipator on Amazon

BobO1176 · Nov 24, 2023

Regarding the wipers:
Dealership changed my wiper motor the first time this happened to me. Worked fine for another 1.5 years after that. Said it was common. Wipers getting erratic again, I assume due for another new motor. the dealership claims it is very common, just a poor part I guess. Maybe try an aftermarket motor if off warranty. I probably will.

BobO1176 · Nov 24, 2023

Truck was/is a 2019..

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