348 windows roll down automatically

Does the 348 spider have a microswitch on the top of the windshield frame (where the left guide pin hole is) which triggers the window drop like the F355 spider? All I can think of is that that switch is faulty or the window controller is faulty, but why it would only do it with the ignition off, I don't know.

Unfortunately, I don't have a wiring diagram for the spider.

 

Assuming the cars are the same, if you can access the plug on that microswitch and create a jumper wire, that should lock out window movement when the roof is unlatched (wind your windows down beforehand if you want the top down). This might allow you to at least park the car.
If the problem still continues, then you'll have to look elsewhere.

Does the 348 have a switch on roof mechanism to tell the window controller that the roof is fully down (and that normal window control can resume)?

 

It would help if the original poster filler out his profile.

 

I'll look to see if I have the wiring diagram. But in the meantime there is a microswitch associated with the Spider's top - Item # 49.

https://www.ricambiamerica.com/car-diagrams/ferrari/v6-v8/348-group/348/top-valid-for-spider.html


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It was the other one I was looking for:

Item #36 in this diagram

https://www.ricambiamerica.com/car-diagrams/ferrari/v6-v8/348-group/348/roof-trims-valid-for-gts-and-spider.html

This will control the initial window drop. The windows stop moving down when they hit the microswitches in the doors.. i.e. #50 in this diagram:

https://www.ricambiamerica.com/car-diagrams/ferrari/v6-v8/348-group/348/doors-glass-lifting-device.html

Thereafter, window control will be frozen by the Window ECU until the folding roof frame hits that back microswitch in the first diagram (#49)

Here's the flow sequence:

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I've marked the switch numbers on the diagram.

 

The F348 Window ECU has the same part number as the F355's. If shorting out that switch doesn't help, then if you're adventurous, you could open up the window ECU and see if there is anything obviously broken. Some of the parts will be easy to find

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For reference, all 4 switches input into the small white 8-pin plug on the ECU (see left side of circuit board in photograph above).

The car connector pinout is as follows:
1. top unlatched switch
2. top fully down switch
3. driver's window down 5cm switch
4. passenger's window down 5cm switch
5. top unlatched switch earth
6. top fully down switch earth
7. driver's window down 5cm switch earth
8. passenger's window down 5cm switch earth

In theory (haven't tried it on my car), if you disconnected the 8 pin plug from the ECU, you would simulate top unlatched, top fully down, windows fully up. This might give you full manual control. Pull the plug, turn on the ignition, wind the windows up, turn off the ignition.
If it works, it's only a temporary measure, of course.

Note: After you've pulled the plug, don't damage your windows by trying to drop the top with your windows fully up.

 

Seems I don't know my left from my right. I meant the right hand side.

It may not be clear from the parts manuals where the ECU is. On the F355, it's under the dash, between the centre console and the pedal box (at least on RHD cars). I assume it's the same on the 348 Spider.