Can someone check on something really quick. Does the STOP button light up when you push it on? Image Unavailable, Please Login
Yes, it should. On mine it does not as the bulb is dead, and that is fine with me as I drive most of the time with the climate control off and when the bulb is continually under power it can be a significant source of heat as I have noticed on my 550, and may eventually cause damage to the switch.
So this controller unit is dead. It does not turn on the fan, or the AC. The Recirculation button does turn the light on when it's pushed so there is power to the unit.
I don’t think you can describe the panel as being “dead”. There are no transistors or microchips in the panel to fail. If power isn’t reaching the panel, you wouldn’t get those symptoms or you would have other parts of the car not working. It could just as easily be the ECU not working or maybe the hidden fuse causing limited power to reach the panel. If there was no power on pin 2 (yellow/red wire) from fuse 12, there would be no panel background lighting (excluding the STOP/RECIRC button lights) . If there was no power on pin 3 (green wire or blue/black on 5.2 car) from the AC System fuse, there would be all kinds of issues, including instrument failures. There have been cases of broken panel circuit board tracks and switches. There may also be multiple issues which have accumulated over time. i.e. no single cause.
https://www.ferrarichat.com/forum/posts/149416968/ (an excellent circuit diagram in that thread c/o @BLUESL These panels can also have burnt resistors and blown diodes.
It depends on what brake system is fitted. If Bosch, it’s mounted to the RH latch assembly for the frunk lid. Also under the carpet/liner.
I just had this problem with my 355. Check to see if the 30A fuse is blown. As previously mentioned it is behind the liner on the right side of the frunk. I replaced the fuse but each time I tried to operate the AC it would blow the fuse, which would disable the AC button and the blower speed selector. I discussed the problem with Brian Crall and he suggested the problem might be a short in the AC compressor and to disconnect the electric connection at the compressor and see if the fuse would blow. Sure enough AC button lite up, blower fan worked and fuse intact. Had compressor fixed and all good. Interestingly a buddy of mine was having the same problem and turned out it was the same issue with his 355!
The compressor is new. The 30 amp fuse is in tact. The light inside the switch is burnt out BUT the major problem is the heater blower is stuck at high setting and the vent positioning is only at the defrost setting. This is the default for when the Hvac controller is bad. So it has been removed and waiting to be sent to a rebuilder.
From what I've seen in photos, the Teves car HVAC ECU is not mounted on the latch. There are two different locations, but yes, they are both under the carpet.
Don't be too sure that the direction function is faulty. There is a lot of anecdotal evidence that not only the outside air temperature affects the air direction (as John says), but that the car appears to need to be fully warmed up before the direction controls work properly. Where did you read about the default settings if the panel (controller) is faulty? The air direction and fan speed are controlled by to different resistor networks in the controller. https://www.ferrarichat.com/forum/posts/149417945/ Or by "controller", you meant the ECU? Fan speed could be a fan speed controller issue, an ECU issue or a panel issue.
