575M gas cap switch pin ID and or color of the wires

....or the relay (R12).

No one on the forum seems to have diagrams for the 575.

You could jumper the relay (socket) to see if the solenoid works. Try jumping pins 3 & 5 (with the ignition on if required).

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I assume power will be on pin 3 from the fuse. Check with a voltmeter. I don't know if this is live battery or switched (ignition key power). Pin 1 may be power from the switch (when pushed). Pin 2 may be an earth.

The switch probably has 4 wires. Backlighting power may be white or yellow/red (typical Ferrari colours). If you can access the back of the switch, look for 12 volts on the wiring:

1) with the ignition on (or not)
2) with the external lights on

There will probably be at least one black earth wire.

 

Use the back-up cable to open. Then do some diagnosis on whether the switch is actuating the release, but not enough to allow opening. Also sometimes caused by the rubber fender protector fouling the mechanism. If you suspect the switch after that, swap with the trunk/boot release switch and see if that works. Then on to Ian's more scientific approach.

 

Taz, does the ignition need to be on for trunk or gas cap lid operation?

 

Ian- No, works fine with the ignition off.

 

Mine will only work if the ignition is off. Where is the backup cable?

 

Interesting. Makes sense. Unfortunately, that might mean that there are more unknown relays for controlling these systems. Now that I think about it, cars such as the 360, 430 and later models use circuitry in the instrument panel to control systems like this (rather than additional socket-mounted relays). We really do need a wiring diagram.

 

"I have been refueling using the release cables, etc ,,"
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Do you hear the solenoid trying to work when pushing the button?

 

Before you start pulling the car apart, do you have power at the relay? And continuity between the switch and the relay?

The manual suggest removing the optional CD player, removing the trunk carpet over the wheelhouse, disconnecting the plug on actuator, then undoing the 2 bolts inside the filler cap cavity (outboard of the actuator plunger)