@Nexus21

 

I was looking for ports relating to Steering Control Unit and found this post, which mentions random operation of engine cooling fan:

 

 

Could be a pointer to BOTH your issues, as wiper stalk signals are routed through the steering control unit, those signals are then passed to the Power supply unit, which controls the rear wiper/washer relays. The front wiper receives a signal from the Power Supply Unit, but it is only a signal and NOT relay controlled. To that end, the rear wiper MOTOR is not driven directly by a relay, it is driven by a power MOSFET on the wiper PCB (I would say the front wiper is the same). The rear wiper PCB has a permanent 12V Live feed from FC41 15A, and two relay controlled signals from the Power Supply Unit. The two relay controlled signals (which will be either 12V or Ground (0V)) will tell the motor PCB whether to activate the rear wiper motor or not. These same two signals also tell the washer pump which way to run, which will determine if water is delivered to the front or rear screen, depending on the voltage polarity applied to the washer motor.

It is not possible to send water to both screens simultaneously and it is not possible to operate the rear wiper and front windscreen washer simultaneously. 

 

Ah.
I was really hoping to find a regular block relay,swap it out and Bob’s your uncle,working rear wiper with washer jet😞

 

If I was brave enough to remove the remapped ecu I would.I have been waiting for a week now for postage to arrive of micro probes to attach to my multimeter probes.

 

But I think I will have to bite the bullet and get an Auto Electrician to run a new ecu-coolant temp sensor 2 wire armoured cable and be done with it.

 

Spent a good chunk of today making 2 new threads in my hubs due to this new “mechanic” who managed to impact wrench mis-thread 2 holes for my longer wheel bolts for spacers.One bolt flew out on a 500 metre test run!!

 

A fantastic tip I found on YouTube saved me a fortune buying and having to have fitted 2 new hubs.....

 

I hacksawed 1/2 way down,right down the centre of the bolt toward the radial head of my bolt.

 

This left a slot through the middle of the bolt about 2cm deep.

 

Cleaned out with a rag the holes then a shot of wd40.

 

Took a while of very slow and nervous hand turning with a 17 socket and ratchet.

 

Got right up to the hub with the radial head on the bolt and it was torque tight.Slowly backed it out by ratchet again,wiped the slotted bolt down with wd40 and onto the next mess of a thread.

Phew!

 

Finally!! As of today,Since owning the car mid November I am now on Vogtland 35mm lowering springs and Bilstein B4 shocks and wheel spacers all around with the new Whitline rear Arb on the back.And it’s safe to test drive!!

 

 

Yet another alignment in a few days after it settles after the new “Mechanic” failed to inform me whilst he had the car a full week for new front strut fitting that the front springs were off some tractor or other not even a Skoda by looks of things with the coloured dots configuration!!!

 

You can see my previous posts about the up n down like a Whores knickers suspension woes over the past 6 weeks.....

 

So as you can see,I am loathe to let any “Mechanic” at my cars/vans if I can help it and do the work myself but that ecu safety cage I’ve read about makes me nervous to do a simple continuity test to the 2 wire coolant temperature sensor I have cut off the connector of.

 

On the rear wiper front I think if there is not a simple relay I can replace then I can live with it only working in reverse.I’ll pop a silicone blank in the rear windscreen motor hole come mot time( Not 100% sure it would be an Mot failure....)

 

At this stage now I just want to drive the bloody car!

 

I hope the cutting new hub thread saves someone on here a few quid.Just take it slow and sure,maybe every 4 tightening turns,bring it back a couple and then continue the full length of the bolt home toward the hub

 

Fantastic help you have been Russ Thank you so much.

 

Maybe tomorrow I will have another fresh look at it?

 

For today I have had my fill of car problems.