mk7 transit wipers wont stop

[llohcins]

Hello all, i'm new to the forum. I have a 2008 transit and the wipers go constantly, ive changed the relay, switch arm and the wiper motor and still it wont bloody stop. my mot is due so it needs sorting. I cant for the life of me figure out what else it could be. i dont have a rain sensor so rules that out as well. The parts were new except for the stalk but when i unplug this the wipers keep going so that makes me think that the replacements fine.

Any help would be greatly appreciated... its driving me mad.

cheers,

Simon

[loot]

There's only 3 wires to these, negative, positive and park, so either the park live isn't disconnecting or the park switch in the motor is faulty?
Fuse 58 and r25 give it main on/of power, what happens when you remove r25?

[llohcins]

It stops moving when i remove r25

[ake]

It stops moving when i remove r25

Can you borrow another relay to try, yours may be stuck on

[llohcins]

Its brand new from ford but i could go and buy another. Dont know anyone that i could borrow one from.

[ake]

Its brand new from ford but i could go and buy another. Dont know anyone that i could borrow one from.

Are there any the same in the fuse box? swap them over?

[llohcins]

Finally got to have another look at the relays, swapped it with r23 and made no difference. It still keeps going dam thing. I rang the garage I use and they said they would have checked everything that I have already so they would probably have to get an auto electrician in. I even rang the local ford garage and they guessed at a dodgy wire and could inspect for £110 inspection fee. Unfortunately in this time the mot has lapsed so now my only choice is to get someone out or get it sorted at the garage I get my mot and get that at the same time.

What I can't understand is that if I remove the stalk it carries on going? If the switch is removed it should break the loop and stop the power should it not? But it doesn't so I guess that means that the stalk is a remote switch for another component which does the actual switching, which means there might be another component that I could change? I'm stumped,

Right pain in the arse.

[loot]

The bcm gives power to the relay 25 which goes to relay 23 for high/low and negative, the switches are negative grounds/resistance inputs to the bcm to give it logical information which it sends to the relays, the fault is either the bcm or between the relay and wiper motor.
Bcm connector 4 pin 3 is wiper on/off logic which goes to pin 2 on relay r25, I'd remove relay r25 and with a multi meter put it to dc volts test and put red + probe to pin 2 relay 25 and black probe- to ground.
You are looking for power where it shouldn't be basically, but it is quite simple according to the wiring diagram. if the relay is sticking on you will likely get the power there at pin 2, the next thing would be to unplug c4 pin 3 and test for power there, if there is power coming from the bcm at all times even when the wiper stalks are unplugged then it may be a faulty bcm

Question: I'm sure there is a relay in the bcm that controls the wipers, it isn't removable but maybe you can pull the front fusebox down and feel the front of the bcm for it clicking when you do the wipers, the question is, do yours work on intermittent or are they just on at the same speed?

Ps. I doubt this is relevant but the thought occurred, the washer motor appears to loop to the bcm so maybe just as a precaution unplug it and see if it is shorting anywhere.

[llohcins]

they are running on constant slow, the speed only changes if i move it up to fast constant. every now and then it might change speed to more like intermittent. I will try the multimeter testing when i get a gap in the rain. Thank you very much for your reply.

[v8dave]

Do you have auto wipers and lights?

Could be a fault with the rain sensor.

[llohcins]

nope neither

[Glawster]

H. Did you find the fault with your wipers as I got one coming tomorrow with the same problem.Thanks

[llohcins]

It was the bcm. Ford wanted £350 for a new one and £150 to put it in and programe it oh and another £105 to diagnose it as they wouldnt do it without as they wouldnt trust another persons diagnosis. I figured balls to that, £605 to stop my wipers wiping? Na, got a mate who wired a relay and switch to the fuse. Relay is taking power from the back of the radio. Now i basically have an on off switch. Not ideal but free. Hope that helps.

[Glawster]

Thank you for the quick reply

[Rig]

Hi,

I thought I'd post in this instead of making a new thread, I've got a similar issue.

When I click down on the stalk for just one single wipe, they carry on, and you can also here the relay going too. But now when they are carrying on for a little while, it sounds as off the relay is doubling clicking as it's supposed to go off. After about 30 second of this, it normally stops. Does this suggest a faulty/sticky relay? Or am I looking at something more serious like the chap above?

Cheers