This might help in finding the problem http://www.ferrarichat.com/forum/348-355/245239-348-window-wiring-switch-diagnoses.html and the install of the switch http://www.ferrarichat.com/forum/technical-q/310804-slow-window-fix-less-than-%2430-00-a.html
Brewman, my 348 is a '91. My switches work different than you describe. On mine the middle connector is positive power input to the switch. The two outer most connectors go to the window motor, providing power when the switch is depressed. At any rate, it is not a switch issue. The switch works fine without the accelerator unit installed. I contacted Ricambi America and, although they hadn't heard of this problem before, they immediately offered to replace the accelerator unit I've been having trouble with. That's excellent customer service!
I have a different problem although it could well be related. My left hand side facing forward (passenger side in RHD models) window will lower using either window switch, but will not raise using either. My conclusion is that it is unlikely to be a wiring or other electrical issue, but I could be wrong!! Any advice from the brotherhood would be most gratefully accepted. Driver's side works just fine Arthur
Did you initially lower the window a little bit, then tried to raise it with both switches? Did you try lowering it more after it didn't go back up? (to prove the fuse didn't blow)? Did you try assisting it with your hand? Can you hear the motor attempting to raise it? Even if it was a wiring issue, the wiring for the passenger window in the wiring diagrams doesn't seem to make much sense. Power from the switch on the driver's side doesn't go anywhere.
Confusing wiring diagram for LHD car... https://www.dropbox.com/t/DyFMVXXo1Y0uFOni When you push the passenger window UP switch on the driver's door, it puts fuse power on the GR wire (yellow/red). That power goes to the passenger's side switch (and it doesn't seem to go anywhere. Miro? @m.stojanovic
The left and right switches for the passenger window are interconnected in such a way that they exclude each other. This is to prevent the "clash" if one switch is pressed "up" and the other "down" at the same time. If, while the window is operated by one switch, the other switch is pressed, the window will stop. This mutual exclusion is achieved via the internal contacts that are "on" when the switch is not activated and are off when the switch is pressed (i.e. they are like "normally on" contacts). The likely reason for the passenger window not operating in one direction is corrosion or burning of the "normally on" contacts or weakening of the spring that holds these contacts together when the switch is not pressed. The picture shows the internals of the window switch. The switch can be opened but, if I remember well, once the part shown on the picture is unclipped from the switch housing, it may be difficult to completely pull it out. It kind of comes half-way out but is still held by something inside (I probably had to destroy the housing to get the pictured part out, cannot remember). If you cannot open-up and inspect/clean the switch contacts, perhaps you can, before buying new switches, first buy a used one for diagnosis. Image Unavailable, Please Login
Thanks Miro. I'm wondering if it's possible to show this "graphically" in a wiring diagram. I still don't understand how the passenger door window is controlled by the driver's side switch. The standard diagrams do seem to show NO and NC contacts, but not how power gets to the window from the driver's side switch.
You can see on the attached (example) diagram that the passenger side window switch gets ground through the NC contacts of the driver's side switch for the passenger window. If, for example, the passenger presses the switch for DOWN and the driver then presses UP, the driver's switch NC contact will open and cut the ground to the passenger's switch and the passenger window motor, preventing short circuit. Image Unavailable, Please Login
There seems to be something wrong with the way the passenger door switch is wired in the Ferrari diagrams. Your diagram shows the UP signal from the driver's side passenger window switch going to the NC contact of the passenger window switch. The Ferrari diagrams show this: Image Unavailable, Please Login e.g. The signal from the passenger window UP switch on the driver's side goes to the NO contact of the UP switch on the passenger side. Perhaps the white (B) and yellow/black (GN) wires should be swapped over.
Yes, the Ferrari diagram is obviously wrong (how is that possible?). If you follow the blue and yellow wires of the passenger side motor all the way through the switches, you will see that, at normal switch positions, one is connected to + and the other to ground meaning the motor would run as soon as the ignition is "on". At the passenger side window switch, the 1.5 GR should go to pin 3 and the 1.5 B to pin 2.
My thoughts exactly.... It's a Ferrari conspiracy to sort out the expert electricians from the pretenders. Here's my new Windows diagram: https://www.dropbox.com/t/SnxOB3hESi2wBEPv
I had this exact same issue with my 348 recently, I ended up spraying WD40 into the window switches as best I could (without removing them) and the windows go up now lol I can only assume they had dirty contacts or were stuck as my car sat for 4 years before I used the windows again and they worked perfect before that. So I will keep the WD40 up to them for a little bit to make sure they are ok, they are still working fine now but after the first time I sprayed them.
