In Antwort auf:

then this means the radio doesn't work if i turn my ignition on (not starting the engine) right?



Not right!

For after-market-radio it's not relevant, original-radio don't need the signal, but if it's there, it regulates the volume - drive faster it will increase, drive slower it will decrease...

For your radio you need ground, permanent + and ignition +, permanent + you will find on the original connector, ground the same way, ignition + you will find beneath the passanger floor on the back of one (I don't know which) of the big connectors (black/yellow/red)

Gruess Roy http://roy-fuchs.smugmug.com/