F355 5.2 motronic Electrical problem

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If you have a car with as many problems as mine, then you'll understand

 

Do all of your warning lights work? e.g. airbag (on startup), suspension setting (normal/soft), brake warning (!) and seat belt? If not, check fuse 24.

If you removed and reinstalled your instrument binnacle, I assume you reinstalled all 5 connectors. Is your speedo and tacho illuminating when you turn on your lights?

 

So you mean the tacho signal.

Unfortunately, it sounds like a power wiring/splice issue (especially if all the warning lights are working). And as mentioned previously, Ferrari doesn't tell you where their splices (pigtails) are.

Figure 5 shows the power wiring (green/white VB). Splice 30048 could be damaged (open circuit). If it's a short circuit, I would imagine you would have a lot more issues.

Euro 5.2 diagram here:

https://www.dropbox.com/t/FvzCJoWTpd5KLeve

Does the oil temperature gauge on your central instrument cluster work?

 

Not many clues here

The system can be affected by that fuse, but if you say it happened before, we’ll have to look elsewhere.

The usual suspects are:
Broken toothed wheel on top of one of the 4 struts
Broken plastic parts in actuators (see CaptainZ CNC website for pictures of broken parts)
Vertical accelerometer behind front bumper. A short in this has been known to blow fuse 24. There is a metal cube inside the accelerometer which becomes dislodged if you go over a pothole or something. It falls onto the internal circuit board and causes a short circuit.

 

Is the fault light illuminating or is the soft suspension light not illuminating when you move the switch ?

 

If you turn on the ignition/start the engine without moving the car, the suspension fault light sometimes illuminates. Just go for a drive to clear the fault.

 

Sorry, cross-posted. If the soft suspension light doesn’t come on, it could just be the switch. It’s wired directly to the light.

If the fault light is on, the suspension system defaults to the hard setting (sport)

 

Rear fog light, or other dual position (latching) type.

 

Careful not to break the plastic frame around the switches. I usually disassemble the gearshift gate and push the switches from behind.

 

How did you determine it was dead?

I haven't heard of any alternatives, but perhaps they can be repaired (although the master chip may be Ferrari-only)


Spider version shown:

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Why are there splices on these wires?

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I would have thought that the left and right sides would be independent (since there are two fuses), but looking at the components on the Spider board, I'm not so sure.

Is the plug seated properly? You have to move it sideways to seat it properly.

Would you be able to take a photo of the internals of your coupe Window ECU?