Well, I have a conundrum, my wipers have stopped working... fuse 15 and 41 are fine, it's not the wiper stalk cause I replaced that with a new one, it's not the motor cause I've replaced that with a known good one.. and I can hear the relay click in the CCM when I move the stalk to wipe the windows.. washer jet works on the front (not so on the rear but that's pipe connection problem for another time) and the rear wipers work just fine... I've even tried bypassing the bonnet switch at the connector just in case it's the switch itself... I'm at a loss anyone able to help?

-2005 Skoda Fabia vRS 

It probably is the relay, because when they wear out the problem is the contacts that carry the high current, not the coil. so just because you hear clicking doesn't mean there's an adequate connection being made. It does confirm that the stalk signal is being received and correctly acted on though. 

 

It sounds like you've ruled out virtually every other possibility except perhaps wiring damage between control unit and wiper motor.  To check this you could unplug the relevant connector from the control unit (with everything off, keys not in ignition) and link two contacts of the loom connector to simulate the relay being switched on and conducting well.

See here: https://www.briskoda.net/forums/topic/488162-strange-windscreen-wiper-behaviour/?do=findComment&comment=5480720  (see also my next post in that thread too, after I'd tried it on my car).

 

 

If that results in wiper function being OK, you face either replacing the relay on the circuit board, or replacing the whole control module (needs minimal coding, none if the donor car has exactly the same options).

 

Relay replacement is described here: https://www.briskoda.net/forums/topic/473170-wiper-relay-replacement/

 

 

Well that works, guess I'm shopping for one of those relays or a control module! Thank you very much for the assistance!

No worries. 

If you do decide that module replacement is the way to go, make sure it has exactly the same part number, as read off yours; and there's one other thing that it would be nice to check, preferably before paying anything to anyone for a secondhand one.

 

There's a fault that sometimes occurs with a surface-mount capacitor on these modules. It may or may not be related to the relay contact failure, difficult to judge cause and effect I think.  Its role seems to be to filter a feedback signal that tells the relevant microcontroller what state the relay is in.

 

In extreme cases the capacitor nukes itself and causes a parasitic battery drain problem, either directly or indirectly.

 

It's here on the board, and the board is pretty straightforward to 'unhouse' from the plastic case:

 

This is a 'well cooked' example:

 

Ooof, I'll keep that in mind!