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36 (20+8+8) pin Head Unit / Car Stereo ISO connector layout
36 (20+8+8) pin Head Unit / Car Stereo ISO connector
Pin Number Wire Colour Connection
A1   No Connection
A2   No Connection
A3   No Connection
A4 Blue 12v Switched
A5   Remote Out
A6 Brown/White or Green/Blue Lighting Input
A7 Pink/White or Pink 12v Permanent
A8 Brown Earth
B1 Yellow Tweeter Right +
B2 Yellow/Black Tweeter Right -
B3 Green/Yellow Speaker Right +
B4 Grey/Green Speaker Right -
B5 Green/Blue Speaker Left +
B6 Grey/Brown Speaker Left -
B7 Green Tweeter Left +
B8 Green/Black Tweeter Left -
C1   No Connection
C2   No Connection
C3   No Connection
C4   No Connection
C5   No Connection
C6   12v Permanent
C7   12v Switched
C8   Radio Mute
C9   Earth
C10   12v Lighting
C11   Phone Speaker +
C12   Phone Speaker -
C13   CD Changer Signal
C14   No Connection
C15   Earth
C16   12v Permanent
C17   12v Switched
C18   CD Changer Input -
C19   CD Changer Input Left
C20   CD Changer Input Right
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Smart Fortwo 450, Roadster car stereo visual pinout:click to enlarge
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