S40 haunted wipers!!

[south coast]

Originally Posted by andy_d

bumped into that info while looking at hid headlights,
now if you dont have aftermarket HiD units, you may think "yeah and so??"
id be checking the r/h headlight ground point for corrosion/other as its shared with the wiper motor as a "well buggger me id never have thought That would do this" which your haunted wipers seem to be heading in the direction of , as spikes /etc in the system can apparently fry the WMM (window module motor )

for the time/effort to check and "nope not that" ,, has to be worth a try ?

This is very interesting. Thank you!

On previous internet trawls, I saw the link between wiper problems and aftermarket HiD lights, but discounted it as I don't have HiD.

HOWEVER, I have very recently had to replace the RHS headlight bulb.

So I will look into this tomorrow

[south coast]

Originally Posted by LizardOfBodom

WIPER module motor , just not to confuse further, but fair play to you for suggesting checking that!
As said above, WMM and headlight wiring shares the same ground points, hence the unfamous WMM+HID issue and few people reporting fried modules. Before Andy, nobody actually asked you if you have aftermarked HIDs installed or any modification to headlamps by any chance?

I don't but I'm going to follow this up. Thank you.

[south coast]

Well, the ground looks OK.

The wipers have gone crazy again though.

First of all, not working when I switched them on

Then, coming on of their own accord and not responding to my attempts to swith off.

In the mix is an intermittent fault code: P0194 Fuel Rail Pressure Sensor A Circuit Intermittent/erratic.

So, the fuse is out again

[andy_d]

er ..er.. er..
cem connections - checked,,
earthing -checked
wiper stalk - checked
rain sensor - checked

,, replacment wiper motor With control board time ? ,, or leave the fuse out, take the motor out , tie a long bit of string to wiper 1, round the a-pillar , through the cabin, round the other a-pillar to the 2nd wiper,, move string to wipe screen ?

[south coast]

Originally Posted by andy_d

er ..er.. er..
cem connections - checked,,
earthing -checked
wiper stalk - checked
rain sensor - checked

,, replacment wiper motor With control board time ? ,, or leave the fuse out, take the motor out , tie a long bit of string to wiper 1, round the a-pillar , through the cabin, round the other a-pillar to the 2nd wiper,, move string to wipe screen ?

Hahaha.. I think you're right. New motor time I think.

Driving around with the fuse out and a cloth in the footwell to clean the window is just not a good solution. Especially as the weather has just got worse and I have some long journeys planned.

A couple of years ago, the AA recovery driver who came to fix my Vectra said that he only buys Volvos as they never go wrong.

So I bought this S40

[south coast]

Originally Posted by andy_d

bumped into that info while looking at hid headlights,
now if you dont have aftermarket HiD units, you may think "yeah and so??"
id be checking the r/h headlight ground point for corrosion/other as its shared with the wiper motor as a "well buggger me id never have thought That would do this" which your haunted wipers seem to be heading in the direction of , as spikes /etc in the system can apparently fry the WMM (window module motor )

for the time/effort to check and "nope not that" ,, has to be worth a try ?

Just out of curiosity, would you agree that the earth is ok here?

[andy_d]

aye that looks ok for earthing
if you Wanted you could loosen them both, clean up the threads etc and pop back together with a bit of conductive lube and tighten the bolts (not over tighten )

but as is ,, looks decent enough to me

[andy_d]

been a thunkings on this (its bugged me but not as much as its bugging you!)

the contacts inside the motor itself,, not for the comm/brushes but the limit switches and the contacts for those,, **usually on one of the gears that drive the wiper linkages, can be 2-3-4 sprung copper contacts and a contact disk/plate on the gear,, they are clean and not corroded arent they?

the contacts Should be behind that big nylon gear


an xc90 motor stripped to show the contacts im referring to , and the condition they shouldn't be in

sadly it means motor off the car and taking to small bits to see /check, and if so cleaning up, re-lube,, Re-seal so water doesnt get in and rebuild onto car to see if its been exorcised yet,,

https://www.theeshadow.com/files/volvo/wmm.html Volvo P1 WMM Repair S40/V50/C70N/C30 may also be worth a look/read


(is your car called Emily rose by any chance :P )

[south coast]

Thanks mate. I appreciate your ongoing interest!

I bought a new (used) motor from eBay and fitted it yesterday.

No change

The only other thing which I'm going to investigate is this wiring.

It looks like the previous owner replaced the motor at some stage and, well, I'm not quite sure what this is all about...

Have they fitted a different unit to the original?

God knows what's going on. Yes, I may have to call in a local priest to perform an exorcism !!

The code reader is generating a 'P0192 Fuel Rail Pressure Sensor Circuit Low Input' error. Can I be 100% sure that this is not related?

[andy_d]

unless its a "shared ground" thing , it Shouldnt be related,,

that wiring does look a bit played with,