W203 wipers horn intermittent fault

[Samp]

I've got a 2003 220 cdi w203 I've got a problem that I can't find a fix for, The wipers horn and possibly mirrors all stop working when you drive over about 5mph, I can go out to car turn them on or use the horn but when I start driving they shut down then if I stop turn of engine then back on they work again till I start driving this will happen 9 out of 10 times

 

[rifiki]

Battery on the way out, bad earth?

 

[mersum1es]

That's crazy fault.... wipers and horn are only malfunctions? Turning signals, headlights etc are all working?

Do you have auto-lock enabled? Try disable it, if it is paralyzing other features... I can't think (at the moment) any other feature which would be speed related.

rear SAM faults can be equal but then usually more functions are out...

 

[Samp]

Everything else works auto locks disabled that the first thing I tryed. Battery load tested fine

 

[brianbrian]

Have you replaced fuses.

 

[Samp]

Checked all fuses relays I can't see it being a fuse problem if they work fine wile you start the car and not wile driving most of the time. I can't see it being a switch problem iver as it's not random intermittent it's at the same time each time it's about same speed as auto locks normaly kick in and I'm sure if they do stay working some times they stay working for the rest of that drive. I'm unsure on a earthing problem for the same reasons I will try and do a utube vid and post the link next time out in the car

 

[Blobcat]

Might be worth taking the fuses and relays out and cleaning the contacts. High resistance can cause random issues when things get warm/hot.

 

[Samp]

Will give it a go.