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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
at the head unit
Grundig
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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