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Stereo Connections
If you want to connect anything to or from your smart standard stereo you are going to need to know what does what.
Fortwo 450 And Roadster
Grundig Radio, Cassette And CD.






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


Fortwo 450 And Roadster
Becker Satellite Navigation (Smart Navigation & Sound)


 

Pin Number Connection
A1 GALA Speed Impulse
A2 K-line
A3 Mute
A4 12v Permanent
A5 12v Remote Out
A6 Lighting Input
A7 12v Switched
A8 Earth
B1 Tweeter Right +
B2 Tweeter Right -
B3 Speaker Right +
B4 Speaker Right -
B5 Speaker Left +
B6 Speaker Left -
B7 Tweeter Left +
B8 Tweeter Left -
C1 CAN High
C2 CAN Low
C3 Reverse Signal
C4 Wake Up
C5 12v Permanent Output
C6 Earth
D1 GPS Antenna
 

999cc Fortwo

Visteon - Radio 9 and Radio 10.





Pin Number Wire Colour Connection
A1 Grey Blue Lighting input, Speedo pin12
A2   No Connection
A3 Black Grey 12v Switched
A4 Red Blue 12v Permanent, Sub pin3
A5 Black Remote out, Sub pin8
A6   No Connection
A7   No Connection
A8 Brown Earth
B1 Blue Tweeter Right +, Sub pin5
B2 Blue Brown Tweeter Right -, Sub pin2
B3 Orange Speaker Right +
B4 Brown Orange Speaker Right -
B5 Green Speaker Left +, Sub pin4
B6 Brown Green Speaker Left -, Sub pin1
B7 Yellow Tweeter Left +
B8 Yellow Brown Tweeter Left -
C1 Violet Line In Left
C2 Green Line In Right
C3 Black Line Ground
C4 Yellow Mute
C5 Blue Switched live
C6 Red Permanent live
C7 Brown Earth


999cc Fortwo

Bosch Highline (touchscreen) & Bosch Lowline (Entryline)






Pin Number Wire Colour Connection
A1 Brown Black Parking Switch for DVD (Highline)
A2   No Connection
A3
No Connection
A4 Red Blue 12v Permanent Live
A5 Black 12v Remote out
A6  Grey Blue Lighting Input Speedo pin 12
A7 Black Grey  12v Switched
A8 Brown Earth
B1 Blue Right : Dash Tweeter +, Sub pin5, Rear +
B2 Brown Blue Right : Dash Tweeter -, Sub pin2, Rear -
B3 Pink Door Right : Speaker & Tweeter +
B4 Brown Pink Door Right : Speaker & Tweeter -
B5 Violet Door Left : Speaker & Tweeter +, Sub pin4
B6 Brown Violet Door Left : Speaker & Tweeter -, Sub pin1
B7 Yellow Left : Dash Tweeter +, Left Rear +
B8 Brown Yellow Left : Dash Tweeter -, Left Rear -
C18
Line Ground
C19
Line In Left
C20
Line In Right



Forfour

Harman Becker Radio5


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


Harman Becker Radio6 And Navigator



Not all Radio6 and Navigator stereos have connection C,



Pin Number Wire Colour Connection
A1 Yellow Red Right Rear +
A2 White Red Right Front +
A3 White Blue Left Front +
A4 Yellow Blue Left Rear +
A5 Grey Red Right Rear -
A6 Black Red Right Front -
A7 Black Blue Left Front -
A8 Grey Left Rear -
A9 Brown CAN Low
A10   No Connection
A11 Brown Red CAN High
A12 Black Earth
A13 White Remote Out
A14   No Connection
A15 Red Black 12V Permanent
A16 Pink CD Changer Wake Up
C6 White Line In Left
C11 Shield Ground
C12 Brown Line In Right
D1 N/A Optical MOST bus out
D2 N/A Optical MOST bus in


Harman Becker Navigator





Pin Number Wire Colour Connection
A1 Yellow Red Right Rear +
A2 White Red Right Front +, Tweeter +, Sub pin2
A3 White Blue Left Front +,Tweeter +, Sub pin1
A4 Yellow Blue Left Rear +
A5 Grey Red Right Rear -, Sub pin5
A6 Black Red Right Front -, Tweeter -
A7 Black Blue Left Front -, Tweeter -
A8 Grey Left Rear -, Sub pin4
A9 Brown CAN Low
A10   No Connection
A11 Brown Red CAN High
A12 Black Earth
A13 White Remote Out, Sub pin8
A14   No Connection
A15 Red Black 12V Permanent, Sub pin3
A16 Pink CD Changer Wake Up
C6 White Line In Left
C11 Shield Ground
C12 Brown Line In Right
D1 N/A Optical MOST bus out
D2 N/A Optical MOST bus in

Are you fitting a non standard stereo?

Fortwo (450) & Roadster.
If you replace the standard 450 or 452 Grundig stereo it will almost certainly work fine to a point.
The main problem is that all the presets are lost every time the car is turned off.

Not to worry, it's simple to fix.

You need to swap the permanent and the ignition supply, this can be done by
inserting a paper clip into the front of the plug at connections A4 and A7 to push
the little clip down so the terminal can be pulled out the back of the ISO plug.

Once they are both out just swap them over and the job is done.

Anything else to consider?

Funny you should say that, yes! Your new head unit will probably output the rear
signals to your tweeters as the smart doesn't have rear speakers.

The signal will be full range and could damage your tweeters unless you add a
high frequency crossover. This only allows the higher notes to reach the tweeter.

Aftermarket Ideal Pinout

Although ISO is a standard, there is a lot of interpretation in the pinout, this is the layout.



The true ISO pinout is as seen below. You have a possibility of 2 mutes and speed
increased volume input on the first 3 pins. Not all stereos will have this function.

Pin Number Wire Colour Connection
A1   Speed volume
A2
Mute 1
A3   Mute 2
A4 Yellow 12v Permanent
A5 Blue  Remote Out
A6 Orange Lighting Input
A7 Red 12v Switched
A8 Black 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 -

Pins A4 to A8 are usually as described above. Note that the 450 and 452 12v wires are opposite.

Fortwo 451 (2007 - 2010)

The  Visteon stereo already has the permanent live attached to the correct A4 pin to power a
standard ISO stereo. However, the switched live needs to be swapped from A3 to A7.
Inserting a paper clip into the front of the plug at connections A3 to push 
the little clip down so the terminal can be pulled out the back of the ISO plug.
Once the terminal has been pulled from A3 it can be pushed into A7. Job done.

Fortwo 451 Facelift (2010 onwards)

The Bosch Highline and Lowline stereos conform to the correct ISO standard.
This means that you should be able to plug most aftermarket stereos into
the smart standard wiring and not need to move any of the connections around.

Anything else to consider?

Well it depends how dynamic the sound is on your new stereo. The existing stereo uses the rear
speaker channels for the tweeters and instead of having a proper equaliser, it cheats by reducing
volume to the rear channels and therefore reducing the high frequencies.

Most aftermarket stereos will have proper EQs and a much wider front and rear sound which
can cause an odd delay (although very small) to the tweeters. To stop this I would
recommend using the same front channels for all of the speakers.

The standard 451 tweeters have a high frequency crossover already built in.
If you replace them with aftermarket ones, make sure they do or add them.

ForFour 454

If you are replacing the single DIN Radio 5 then you will need to find a switched live from
somewhere as the existing stereo has the permanent live at A4 but no switched wire at all.
This is because it is switched through the CAN bus. A switched live can usually be found
at the back of the cigarette lighter socket. The new switched live goes to pin A7.

If you are replacing a double DIN Radio 6 then you will need a Quadlock to ISO convertor.
As above, you will also need to locate a switched live wire for pin A7.

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