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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
Harman Becker Radio 5
Pin Number Wire Colour Connection
A1 Green Red Hands Free Module
A2   No Connection
A3 Black Blue Hands Free Module
A4 Red Black 12v Permanent, Sub pin3
A5 White Remote Out, Sub pin8
A6 Brown Red LIN Voltage
A7 Brown 12v
A8 Black Earth
B1 Yellow Red Rear Right Speaker +
B2 Grey Red Rear Right Speaker -, Sub pin5
B3 White Red Right Door Speaker +, Tweeter +, Sub pin2
B4 Black Red Right Door Speaker -, Tweeter -
B5 White Blue Left Door Speaker +, Tweeter +, Sub pin1
B6 Brown Green Left Door Speaker -, Tweeter -
B7 Yellow Blue Rear Left Speaker +
B8 Grey Rear Left Speaker -, Sub pin4
C1 White Line In Left
C2 Brown Line In Right
C3 Shield Line Ground
Pinout status: +1 -1
According to 2 reports in our database (1 positive and 1 negative) the Smart Forfour car stereo pinout may be incorrect.

Is this pinout
NO DIY devices
Smart Forfour car stereo visual pinout:click to enlarge
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