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451 Aftermarket Stereo

Modification Details




451 Fortwo Aftermarket Stereo Fitting

You will probably be replacing 1 of 3 types of smart stereo.

The original stereo, double height with no touch screen. (Radio 9 or 10)
The facelift interior single height with no touch screen. (Lowline)
The facelift interior double height with a touch screen. (highline)

Each one of these will require a specific replacement stereo surround to match the hole in your dashboard.

I was replacing a Radio 9 so I got the correct surround for this job. I screwed the side panels in place...



...and slid the replacement stereo in from the rear.



Line it up and use the screws provided with your head unit to fix in in place.



Many aftermarket stereos have unusual connectors but they will always come with an adapter.



Quite often, the adapter will have bullet connectors that can be swapped around, however...



...the smart has an unusual layout for the connections so you'll probably have to swap them around to suit.
Looking at the numbers moulded into the connectors, you can see that the standard smart connector (top)
has connections for 1, 3, 4, 5 and 8. But the new stereo (bottom) has connections for 4, 5, 6, 7 and 8.

In this instance we need to swap 2 wires.
Red wire (switched live) pin 7 to position 3.
Orange/white wire (lighting input) pin 6 to position 1.



If you flip the new connector around and view the pins. You need to push something long, thin and strong
down the hole (arrowed below) to flatten a small metal tab. With the tab flat, the connector can pull out.



Here I have used a dental tool but you can get proper terminal removal tools.



You can see the metal tab that has been flattened down.



Get a knife behind it and carefully lever it back up.
You can now slide the terminal back into the correct position in the housing.



There is a good chance that the ISO aerial connector of the smart won't fit the DIN connector of the stereo.



So you will require an ISO to DIN adapter. Cheap on eBay.



Push the adapter in and your esiting aerial connector will just push onto it.
If you have any other connections such as DAB, GPS etc, do these now.
Connect the power and speaker connections also.



Slide the stereo construction into the dashboard.



If the switched live is wired correctly, the stereo should come on with the ignition.



Set the time and some favourite radio stations. Turn the car off and then back on again.
If the permanent live is wired correctly, the stereo will remember the time and station settings.



If everything is OK, screw it to the dashboard.



Place the cover surround around the stereo and replace the lower hidden screw.



Replace the button bank and you are done.


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