1991 348 TS - mechanically rebuilt 3 years ago. Rebuild wiring harness. I just replaced all fuses and relays (after this problem) Problem: Whole center console (where the fan, heat, a/c is) started throwing codes (weird emblems on the display screen) and acting up. Now it’s just off and doesn’t turn on. Does this sound like a fuse box issue? I heard the connections/soldering underneath the fuse box go bad. Thoughts? I found this disconnected and reconnected it but nothing changed. Anyone know what the attached connection is for? Thanks Image Unavailable, Please Login Sent from my iPhone using FerrariChat
The most common problem is the control panel backplug. Wiggle the plug and see what happens. You may have to reposition the wiring to get it to sit properly. I recall that some folks ziptie the harness in place. Of course, clean the pins and sockets. Check for loose pins/sockets.
Does it look like this ie all the ac controls and clock dead - if so check the "hidden fuses" in the frunk Image Unavailable, Please Login This is a UK RH drive car so will be different on yours. Look for 2 green relays and (maybe) melted fuses next to them. Common mod is to change them to a glass fuse or in my case a circuit breaker so it can be reset easily. Image Unavailable, Please Login
Yes, looks like that. Gauges work but everything else is off. Your interior color is beautiful! I’ll clean and fiddle with the plugs on the screen. Where are the “hidden” fuses located? I have 2 random relays that no one knows what they’re for. Maybe it was the two “hidden” ones relocated. Pic attached. Did anyone know what that long black connector behind the center console screen is for? Pic in first post. Image Unavailable, Please Login Sent from my iPhone using FerrariChat
If you search the 348 section for "hidden fuses" its a common problem. On a UK RHD car its near the ABS pump, for LHD judging by the pic on the link below its near the ABS computer and the 4 relays in front of it. https://www.ferrarichat.com/forum/posts/143924241/
The only 16 pin connectors I could find in the wiring diagrams were for the mousetrack seatbelt ECUs. They should be in that general area. The Spider has a Window Control Unit with one 16-pin plug.
Bolted to the RH side of the evaporator unit in the forward luggage compartment. You'd have to remove the luggage compartment liner to see them.
Mousetrack ECU here: https://www.ferrarichat.com/forum/posts/144326680/ If your mousetrack has been replaced, disconnect that plug (and it's partner). They have been known to cause speedos to burn out.
Again this is a RHD car but your looking for 2 green relays, one of which has a fuse attached. Earlier cars had a blade fuse that is prone to melting (like mine in pic). IIRC later cars have a heavier duty glass tube type fuse. I just replaced mine with a circuit breaker type fuse so you can easily reset it if it ever trips out. With main carpet removed Image Unavailable, Please Login Image Unavailable, Please Login Image Unavailable, Please Login Original melted fuse Image Unavailable, Please Login
Hidden fuse was burned. It was 40A and I replaced with 30A per these forums. Brown wires. It was modified at one point and the crimp shows signs of burning too. Your thoughts Image Unavailable, Please Login Image Unavailable, Please Login Image Unavailable, Please Login on the crimp showing signs of burning?
Probably best to fit a glass type fuse. It's a common fix. They handle the heat better. The fuses have to cope with relatively high currents for long periods. Don't panic just yet When fitting the new fuse holder and wiring, be sure to kill the battery (one of the brown wires will be live). Wiring diagram here: https://www.dropbox.com/t/s7EvZX4dw1oN0Mr6 See item 69 (fuse). The power goes from the fuse to relay "68" and to the control panel. Make sure the sockets and pins are ok on relay 68 and the one next to it.. Clean the sockets and pins to help with continuity. By the way, those four relays together (in your second photo) and 3 fuses are for the ABS. Unrelated to HVAC.
You've done the right thing switching back to a 30amp. Does your panel light up now? Since the wiring has already been modified with the crimped connections why not consider extending the wiring as per video below to make it more accessible? skip to to 4:10 I would still swap over to a breaker type fuse as I did. Much more convenient for experimenting or if your out and about. I cant say for 100% I got to the bottom of the cause but I noticed that if I ran the fan speed at 4 bars or less the aircon would run all day without issue, however, over 4 bars and after about 10 minutes or so it would trigger the breaker fuse and I'd have to reset it. In the end I changed the resistor power pack and after a few initial gremlins seemed to settle down and I can run the fan speed as many bars as I like and its never done it since. Power packs are NLA but Miro on here came up with a fix for them - maybe speak to him (if that is what the problem is). Image Unavailable, Please Login
Yes, panel lights up now after replacing the fuse but I’m working through an “E8” error. Cleaning all grounds right now. I found the clear hose from this lump disconnected. Not sure what it is for. Image Unavailable, Please Login This multi ground point mounts to a bolt that’s only touching the plastic of the air box? Shouldn’t it be mounted to a frame section for ground? Image Unavailable, Please Login Sent from my iPhone using FerrariChat
The lump or the hose? Is it attached to the hot water pump? I can't tell from the photo. I've only seen pumps with two hoses, not three. Is it simply a drain hose for condensation? Although fault code E8 is officially related to the hot water pump, I seem to recall in one case that it wasn't (I tried to find the forum message thread on this, but I'm not having much luck)
If your E8 error does turn out to be the heater recirc pump you can get a genuine bosch but with a more modern plug quite cheaply - cured the error for me https://www.clubscuderia.co.uk/forum/showthread.php?45388-348-DIY-quot-Restoration-quot&p=774910#post774910
Image Unavailable, Please Login Image Unavailable, Please Login My frunk relay and fuse box is pretty nasty so I’m rebuilding it. I’ll update this thread once we know if it works or not. Attempting to fix intermittent E7 and E8 error. I also have a “click” only starting problem. All new relays and fuses. Sent from my iPhone using FerrariChat
There is another thread out here when that heat pump seizes and you get that e8 it can sometimes cause some of the transistors to get hot and sort of melt connections in the HVAC control assembly itself. I think the form ID was weighed check for thread from him how he repaired it. That's one reason I replaced the heat pump even though it wasn't bad to prevent that from happening. Sent using FerrariChat.com mobile app
