Check Engine light on 1998 355 F1Spider

OK, I'm confused. In your original message you said that the top was down. Is this a new problem?

Is your roof latched properly? Does the microswitch in the left hand locating/guide pin hole on top of the windowshield frame feel normal when you push it with a screwdriver or something similar?

 

Here's a flow chart which I created for automatic window operation.

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To be honest, though, I didn't think about what would happen if the switch on the left hand primary ram slider plate was permanently open.

 

For clarity, I mean switch S9

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How long ago was it converted? Has something had time to fail since a successful conversion?

 

Yikes. Can you take a photo of the broken part?

I was was putting a new canvas on my roof a year or two ago and noted I could only access some of the internal latching mechanism (Even to access that, I recall I had to peel back some of the material glued to the front crossbar.

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I have no idea where you would get parts

(EDIT: seems that a lot of the parts are available individually... new)

https://www.eurospares.co.uk/parts/ferrari/355-52-motronic/bodywork-lighting/top-41121

That centre block, rods, springs, etc, are shown in the link above.

 

Currently, with the roof unlatched (not that you have a choice) and the slider switch "Sx" unplugged, are both windows sitting 2 inches down?

In summary:

1) unlatching the roof and lifting it a few inches should open microswitch S9 on the windshield top frame and drop the windows 2 inches. In theory, you could short out the microswitch or stick something in the hole to activate the switch to simulate roof closed. This should give you manual window control.
2) if it's not possible to do step 1, the roof is effectively open (to system logic). If both windows are down 2 inches, control is transferred to the left hand primary ram slider plate microswitch (Sx). This hasn't helped in your case, so the issue may be the Window ECU.

 

Seems like you're trying to make a point here My point is that the windows went down to the 2 inch mark. So, at some point in time, the windows worked (in auto mode). I don't know how long you've had the roof down.
If the windows are not working in auto or manual with the ignition in RUN and you've proved that the microswitches Sx and S9 are ok, then the only thing left is the Window ECU and its power. The wiring diagrams show power from the ignition switch and the two fuses (27 & 28 on the 5.2 car) going to the Window ECU.

You could make sure that the 3 plugs on the Window ECU are secure. Other than that, I guess it's a case of getting out your voltmeter to check the inputs to the Window ECU.

Here's my wiring diagram:

https://www.dropbox.com/t/CIhGFOghr8n8bxLM

There is an input into the Window ECU from the door open switches, but on my car it doesn't matter, the windows work with the doors open or closed.

Note: I just confirmed on my car that the windows will resume manual control with the roof ajar (unlatched) and the microswitch on the slider pushed.

 

So you're basically saying that part 54 has somehow detached from the claw.

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These mechanical bits scare me. That roof section is sealed apart from the access panel in the centre.

EDIT: Can you see where part 54 has detached from the claw or has it detached at the handle end?

To get the access panel off, you need to remove the handle. This is a pain. You need a very narrow pin punch and some kind of reaction block. I put masking tape over the area where the pin punch is hitting so it wouldn't bounce and scratch the handle.

 

If the parts are available, it may not be an insurmountable problem. I just had a look at mine and access around the claw is generally good. The claw bracket seems to be held on with an allen screw at one end. Not sure about the other. I tried to take a video, but the lighting in my garage is not good. If you remove that leather cover, you may have better access.

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Understood.

Note that my coloured wiring diagram has been used by professionals, but you still need a technician who knows his way around the car.

Anyway, get some rest. It must be close to bedtime in Texas

 

Here's my shaky video, but you can't see too much...

https://youtu.be/-HruBnwdNLk

 

I just remembered that the Window ECU on a LHD car is pretty hard to get to:

https://www.ferrarichat.com/forum/posts/144793751/

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Image c/o Dave Sticky Rx Lelonek