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sgrothe

Subwoofer underground dash connection

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Yes I had future shop hook my J L Auto sub to my 451 radio. He hooked it up to the wires that feed the stock under seat sub

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Yes. Smart madness has a nice box/woofer combo that fits under the dash. Seems like a good price too.

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For 2012 and up:

There are 2 plugs.. One is for power, the other is for the speakers. If you look on the plugs, you will see numbers on the connector next to each lead.

Speaker harness:

1: Blue = Rear Right +
2: Brown/Blue = Rear Right -
3: Pink = Right Front +
4: Brown/Pink = Right Front -
5: Violet = Left Front +
6: Brown/Violet = Left Front -
7: Yellow = Left Rear +
8: Brown/Yellow = Left Rear -


Power harness:

1: Brown/Black = Unknown (I was unable to identify this)
2: No connection
3: No connection
4: 2x Red/Blue = Const 12v + Battery
5: 2x Black = Amp Power
6: Blue/Gray = Dimmer
7: Black/Gray = 12v + Ignition
8: Brown = Ground -

From:

http://www.smartcarofamerica.com/forums/f76/2012-fortwo-radio-harness-wiring-43547/

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Typically for a sub you will tap into one or two of the main speaker wires depending on the configuration of your amp. Remember you need an amp too, or else you will not have any significant volume from your sub and you will blow your power outputs because there's too much draw on the channels.

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