nine_fofo

Hi All

So Ive just bought my first 944 she is 2.5 lux registered in May 1986

She has several electric gremlins I need to sort but my first one has me a bit stumped, its is the electric windows.

They will only operate perfect via either switch when the doors is open. Once it's doors they are dead.

Does anyone have any suggestions.

The switches seem ok otherwise I guess they wouldn't operate at all?

I can here the relay clicking when the door opens.

Wisconsin Joe

Going to guess a broken wire in the area that flexes when the doors are opened/closed.

Try wiggling the wires around when the doors are open and see what happens.

nine_fofo

Tried this but it is making no difference. I have the door open, windows work

Push in the interior courtesy light button with thumb ( so it thinks door is closed ) windows don't operate.

Wisconsin Joe

Ok, you didn't mention the door switch making it 'do it's thing' in the OP.

No clue how in the world it could happen, but it would seem that the windows have been wired into that switch.

aussie944cab

The door switches connect to the poweer window regulator relay, so as to allow the window to be closed(raised) with ignition off but door open(in a case that you've forgotten to close them before getting out)
I would suspect that either the relay is bad or the ground for the relay
Steve

nine_fofo

Thanks for the explanation that would make sense, I'll give the relay a try and let you know.
👍

951Dreams

From the manual. I know it doesn't describe your weird results exactly, but I wonder if that last sentence could be related. Like maybe that circuit is mis-wired or bad.

Does the door being open allow you to roll up the windows regardless of if the key is ON/OFF or removed? Does it work multiple times? I mean can you open the door, the windows work. Close the door and reopen it and they still work?

Just trying to get my head around the issue.

nine_fofo

Hi

I'll go through the symptoms below I'm listing the actions as I do them

• Disarm immobiliser/alarm, unlock door with key, open door, press window buttons both work fine. No key in ignition.
• Close door windows don't work, no key in ignition
• Doors closed, ignition on. Windows not working
• Open doors, ignition on, windows work
• Ignition off Remove key, doors still open windows still work
• Courtesy light goes out from timer, windows still work.

I can open and close the door multiple times and the windows will still on work when the door is open.

I have removed all switches and cleaned contacts, removed door switch, cleaned contacts.

i should mention it makes no difference which door is open all switches and both doors operate fine asking as some door is open.

I can hear the relay clicking when I open the doors. And I have also removed and cleaned the relay even though it was clean when I opened it

So any help is massively appreciated it's all just a bit odd and all suggestions are welcome

Thanks again

aussie944cab

It appears that the Uk and US cars are configered differently
From a UK manual
"When the doors are closed the windows only function with the ignition switch in pos. 1 or 2. When a door is open the window can function even if the ignition key is not inserted"

https://www.manualslib.com/manual/39...page=89#manual
Check that you have 12V at the relay when you turn on the ignition, I think Terminal X is the supply which is interupted when the starter is cranking, Terminal 31 is Ground

951Dreams

Well, didn't know that!!! Good stuff!!!

So as OP is from the UK, we'll assume he has a ROW car. From what the UK manual tells us, the part of the system that allows the windows to work with the door open is working! That's good.

So with all the info we have now, aussie is 100% on the right track! Your problem is that the ignition isn't powering your windows!!! Only the "door open" circuit is!!!

On US cars at least, there are are for sure two relays that handle the accessories/interior stuff with ignition on! One is G14 (Ignition Relay X on US cars).... and it controls blower motor and power windows.... and only those two things it seems. How do I know??

My Windows not working thread

Now this should ALSO mean your blower motor isn't working, if it's the G14 relay. But since you have a ROW car, that's not 100% for sure! I had totally forgotten about my issue till I started writing this post, my concern had been the blower motor, the widows were a side issue to me. But it clicked when I started thinking ignition relays! Try swapping another relay into G14, and see if your windows work!!! If that's it, you'll be the only other person I've found with the G14 problem. Took me quite a while to track it down since nothing anywhere tells us what G14 does exactly. But I know for sure it's window and blower related on US cars.

nine_fofo

So sorry for the delay in response work and personal life got in the way of posting an update. But I just wanted to thank you for the guidance. You were bang on with this being the G14 relay.

I couldn't get the original relay anywhere new so porsche in nottinNott ordered me in the equivalent and now my windows work perfectly as they should. Door open or closed.

Indeed my blower motor was not working but that was next on the list so you fixed both my issues.

Thanks so much for the help 🤘

For anyone's reference the relay below was the one removed

Original G14 relay

Original G14 relay

Porsche replacement / alternative relay

Porsche replacement / alternative relay

Porsche replacement / alternative relay

MjRodrigues

have you solved the problem? I have the same problem... i think i have a fix for that... the relay itself is stupid and that is normal to happen... cause you always have positive from the 30 pin... when you open the doors the is a ground from the luggage compartment light that activates the relay on 85a pin... i suppose you have the original relay that has a connection before the internal switch... i believe porsche redesigned the relay so it has a connection after the internal switch so it only gets power when you turn on the key (86pin)... i ordered a relay like that and when it arrives ill keep you posted

MjRodrigues

i swaped the original relay and it is working perfectly...

the original relay has a connection to the 30 line which is battery power instead of the 87 line... since the circuit 85b is connected to the open door switch it works everytime you open the door... with this relay the windows only work when you have the key on the ignition... no more battery drain... if it still does not work for you you must check the key wiring!!!

jaime62729

im having the same issue on my 84 Porsche 944. What relay do I have to change? Can’t seem to figure out which one it is from the relay boxe diagram

orig944

Relay for the early cars is above the accelerator pedal clipped to the heater duct (or something up there.)