2008 V50 2.0d Wipers Not Working

SimonP2 · Nov 29th, 2019, 13:08

Hi All,
I've had the car a couple of months now and worked through some minor issues with the help of this forum - Thanks!

On Wednesday, raining and having stood for a few days I started the car, switched the wipers on and nothing happened.
No front wipers in any position
Washers work fine
Rear wiper works fine

I have read all the posts that I can find and:
Charged the battery
Checked Fuse F17
Removed and taken apart the wiper motor - Looks OK Nothing obvious
Checked the voltage at the wiper motor plug +12v, Gnd, Signal (I assume) 5v
For good measure I replaced the Pollen Filter and in doing so removed and replaced all of the plugs from the CEM (?) and checked F69 which was OK.

I don't have PID lights.
What else should I check?

Thanks,
Simon

SimonP2 · Dec 1st, 2019, 23:51

I took the CEM out and cleaned the terminals - No improvement.

I have noticed that when I put it into reverse the rear wiper operates. It does this with the front wiper stalk in all positions so the logic is that the wipers are on (even when they are off)

I took the wiper motor out again this evening with the plan of buying another one, but I have checked the plug again and there is no signal. From what I have read it is on the LIN BUS and I should see 7volts - the LIN BUS is +1v to +12v so I assume this is an average of the signal.

Does anyone know where the other end of the wiper signal wire is so that I can check continuity?

To add to my woes I have tried my 3 OBD2 cables/tools and none work - Some standard! Is there any software that will give me any level of detail of what is talking to what? or do I need to fork out for a ripped off version of the Volvo software?

brutusmotorsport · Dec 2nd, 2019, 14:48

could be switch faulty itself.

SimonP2 · Dec 5th, 2019, 15:23

I checked continuity of the signal wire and quickly found a break near the plug where it bends to join the harness. Now works perfectly.

Thanks Brutu, I discounted the switch partly because everything else on the stalk was working and the rear wiper worked when selecting reverse. The logic for this is front wipers on, so if the switch had failed providing "on" logic the front wipers would be on continuously.

The perhaps useful part for anyone else fault finding is that open circuit on the signal wire will make the rear wiper work when reverse is selected.

Nov 29th, 2019, 13:08	#1
SimonP2 New Member Last Online: Mar 25th, 2024 19:06 Join Date: Sep 2019 Location: Kent	2008 V50 2.0d Wipers Not Working Hi All, I've had the car a couple of months now and worked through some minor issues with the help of this forum - Thanks! On Wednesday, raining and having stood for a few days I started the car, switched the wipers on and nothing happened. No front wipers in any position Washers work fine Rear wiper works fine I have read all the posts that I can find and: Charged the battery Checked Fuse F17 Removed and taken apart the wiper motor - Looks OK Nothing obvious Checked the voltage at the wiper motor plug +12v, Gnd, Signal (I assume) 5v For good measure I replaced the Pollen Filter and in doing so removed and replaced all of the plugs from the CEM (?) and checked F69 which was OK. I don't have PID lights. What else should I check? Thanks, Simon

Dec 2nd, 2019, 14:48	#3
brutusmotorsport Junior Member Last Online: Dec 23rd, 2023 10:45 Join Date: Nov 2019 Location: guildford	switch could be switch faulty itself.

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Dec 1st, 2019, 23:51	#2
SimonP2 New Member Last Online: Mar 25th, 2024 19:06 Join Date: Sep 2019 Location: Kent	I took the CEM out and cleaned the terminals - No improvement. I have noticed that when I put it into reverse the rear wiper operates. It does this with the front wiper stalk in all positions so the logic is that the wipers are on (even when they are off) I took the wiper motor out again this evening with the plan of buying another one, but I have checked the plug again and there is no signal. From what I have read it is on the LIN BUS and I should see 7volts - the LIN BUS is +1v to +12v so I assume this is an average of the signal. Does anyone know where the other end of the wiper signal wire is so that I can check continuity? To add to my woes I have tried my 3 OBD2 cables/tools and none work - Some standard! Is there any software that will give me any level of detail of what is talking to what? or do I need to fork out for a ripped off version of the Volvo software?

Dec 5th, 2019, 15:23	#4
SimonP2 New Member Last Online: Mar 25th, 2024 19:06 Join Date: Sep 2019 Location: Kent	I checked continuity of the signal wire and quickly found a break near the plug where it bends to join the harness. Now works perfectly. Thanks Brutu, I discounted the switch partly because everything else on the stalk was working and the rear wiper worked when selecting reverse. The logic for this is front wipers on, so if the switch had failed providing "on" logic the front wipers would be on continuously. The perhaps useful part for anyone else fault finding is that open circuit on the signal wire will make the rear wiper work when reverse is selected.

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