Mondial 3.2 QV cab rear bonnet electric release

Do you have an owners manual? It points to where the relays are. A recent thread on the same topic (although a t) should help out as well, including a warning or two.

http://www.ferrarichat.com/forum/showthread.php?t=255786

 

There is no separate relay -- there appears to be some sort of relay function built into the switch itself (unfortunately, the scan of the Mondial 3.2 wiring diagram book that I have is not very good so the switch internals aren't that clear). From your report of the symptom I'd say the most likely curprit is the switch itself:

1. The switches for the front bonnet and the rear bonnet share the same +12V power source and fuse -- so since the front switch works that's a good sign that +12V power is reaching the rear bonnet switch too,

2. The wiring going to the engine bonnet solenoid and the rear bonnet solenoid pass thru the same C1 connectors -- always possible that a single connection is bad, but the other connection being OK at least confirms that the connector is probably still plugged in, and

3. all three bonnet switch appear to have the exact same internal structure so your report of "no sound" for the rear bonnet switch compared to the others is a bad sign for the rear bonnet switch.

The three switches have different part numbers (and you won't like their price either ), but I think that is only because the silkscreen markings are different. As I mentioned above, they appear to have identical internal function (and connections) so if you could try one of the other switches (front bonnet or engine bonnet) in place of the rear bonnet switch that would be my suggestion as the best diagnostic next step. Good hunting!

 

Unfortunately, I can't help you with this part -- perhaps a fellow Mondial Owner will be able to help, or let you know if a thread on the subject already exists.

 

Jay, to remove the switches you need to pull the tach first. To do that, remove its bezel first by gently pulling at it with your fingernails from inside the rim. The rest is pretty obvious.

It's been several years so I don't remember every step but you'll find that it isn't too difficult.

 

Just so happens that I was able to dig out my old switch from about 14 years and 3 moves ago.

As you can see, there are two clips on this side and the other as well. Just work one side at a time, sort of rocking it out.

Be VERY careful with disconnecting the electrical connectors otherwise the circuit board will crack.
Image Unavailable, Please Login
Image Unavailable, Please Login
Image Unavailable, Please Login
Image Unavailable, Please Login

 

Curiosity got the best of me so I took it apart. Maybe these pictures will come in handy for others in the future.

Even though this is a switch for the engine cover, the internals should be similar to the others.

BTW, this switch is from a U.S. spec 1982 Mondial 8.
Image Unavailable, Please Login
Image Unavailable, Please Login

 

Well, look at that, there is a solenoid inside.
Image Unavailable, Please Login

 

Yes - the combination $300 relay and switch

Seriously, my guess is that their function is to apply +12V power to the solenoid actuators for a fixed time period -- regardless of how quickly or slowly you press/hold the switch button.

Do individual wires connect to the back of each switch, or is there some sort of motherboard that all of the switches plug into? (that's what the symbology on the schematic seems to suggest).

 

You're welcome and yes, please post some pics, especially one that'll answer Steve's question below. I'm thinking wires but am not sure.

 

On the schematic, only 4 pins are shown as being used on all three bonnet switches, and the internals are all identical. The schematic does show 5 pins being used on the window switch, but the internals are different for that switch (so it was a little risky IMO to try that switch for the rear bonnet). That 5th pin may be used on some other make automobile that uses the same switch -- just a thought (as the logo on the switch button really doesn't look like a Mondial )...

It's not a typical part that get replaced routinely, so it doesn't show on their website, but I'd get a price from www.allferrariparts.com before deciding how much time is worth "investing" in fixing the old one, and the price at www.eurospares.co.uk isn't too crazy. The other option is find a used one from a salvaged car -- even in a bad crash, it would survive.

 

Hi,

Looks like the switch is easy to fix
As far as I can see there is a resistor, diode, transistor and a coil
Check the resistance of the coil
I can rewind the coil at work for you if needed
No need to spend 100s of dollars if you ask me

 

Jay, I gently pried at each corner and the faceplate popped right off. It snaps back on just as easily although I wouldn't do that too many times since its mount pins were secured by heating/melting. It does feel pretty tight though.

The faceplate is not a load-bearing component of the switch overall (flange on white housing for that) so you should be okay.

The more I look at it the more I'm convinced that this switch was designed, not as a consumable, but to simplify repair and maintenance instead.

 

That coil looks like the one in a Bosch relay 0 332 014 113, if it's only to make contact to actuate solenoids.

Guido
Image Unavailable, Please Login
Image Unavailable, Please Login

 

I see what you mean. After I popped off the faceplate, the board slid out with a little help. It's apparent that the electrical contacts were "riveted" on last and you will have to remove them to slide out the internal assembly. Still doable, but not with ordinary hand tools I'm afraid.