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Swim_Cap

Member Since: 13 Oct 2019
Location: Cumbria
Posts: 17

2009 Defender 90 Puma 2.4 HT Zermatt Silver

Windscreen Wipers - very strange.....

Good evening all!

So my windscreen wipers kick in when I turn the key 🤔 I’ve change the wiper arm switch, the relay and the wiper motor park switch; and it’s still happening! Can somebody point me in the right direction to resolve this issue please?

2009 2.4Tdci

Thank in advance 👍

6th Nov 2019 7:45pm

blackwolf

Member Since: 03 Nov 2009
Location: South West England
Posts: 17305

2007 Defender 110 Puma 2.4 DCPU Stornoway Grey

Park switch is the obvious culprit. Have you actually tested the operation of the switch rather than just assuming that the new one works?

6th Nov 2019 8:11pm

Swim_Cap

Member Since: 13 Oct 2019
Location: Cumbria
Posts: 17

Hiya, no I didn’t I changed for a new item. How do you test it?

6th Nov 2019 8:26pm

Scotm

Member Since: 28 Feb 2014
Location: Aberdeenshire
Posts: 666

2012 Defender 110 Puma 2.2 SW Orkney Grey

If you remove the park switch but leave it connected you can operate it manually to test.

I had one where there was some play in the wiper gear shaft that meant the white plastic bit on the gear wasn't operating the switch properly. Had to fit another washer behind the spring clip to bring it nearer.

7th Nov 2019 8:54am

blackwolf

Member Since: 03 Nov 2009
Location: South West England
Posts: 17305

As Scotm says, if you unclip it from the motor you can operate it by pressing the operating pin.

With the wiper switch off and the ignition on, the wipers should run with the pin released (the motor thinks that the wipers are not parked) and should stop abruptly if the pin is pressed. If this happens, the switch is working, however it may still be the case that the cam on the motor gear wheel is not operating the switch properly. In this case, try Scotm's suggestion.

The park switch operates by (in the not parked mode) connecting the motor's low speed connector to an ignition-controlled live feed and earth connector to earth, and (in the parked mode) by disconnecting both and shorting them together so that the back-EMF of the motor acts as a brake.

Generally a park switch fault if the only thing that will cause a wiper motor to run when switched off (the motor thinks the wipers are not parked).

7th Nov 2019 9:04am

Swim_Cap

Member Since: 13 Oct 2019
Location: Cumbria
Posts: 17

Scotm & Blackwolf - thank you so much for this information! I will strip it down at the weekend and test the switch, and the old switch that I took off, to establish where the fault is.

Thanks again - what a great Forum

7th Nov 2019 11:20am

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