How to Wire a Smart Car Radio

Written by ryan carter | 13/05/2017
How to Wire a Smart Car Radio
An aftermarket wiring harness simplifies wiring a stereo in a smart car. (Thomas Northcut/Photodisc/Getty Images)

Smart is a German automobile manufacturer that is part of Daimler, specialising in mini-cars. While smart vehicles are smaller than most vehicles on the road today, their factory stereos are similar to those of other manufacturers' vehicles. Both DIN- and Double-DIN-size aftermarket stereos can be installed in a smart vehicle, which has over 10 inches of usable space behind the dashboard.

Disconnect the negative (-) battery cable from the vehicle's battery using a crescent wrench.

Remove the plastic trim piece that surrounds the factory stereo, using a screwdriver. Be careful not to damage the plastic. Remove the screws holding the stereo in place. Slide the stereo away from the vehicle's dashboard, exposing the wires. Unplug the stereo's wiring harness. Unplug the antenna from the stereo. The factory stereo is now disconnected.

Slide the half metal sleeve from the aftermarket stereo into an aftermarket mounting bracket and secure it by using a screwdriver to bend the metal tabs near the outermost edge. Install the mounting bracket with metal sleeve into the dashboard of the vehicle, following the directions accompanying the bracket. Secure the mounting bracket using the screws that were removed with the factory stereo.

Attach an aftermarket wiring harness, specifically manufactured to plug into the smart vehicle's harness, to the aftermarket stereo by matching the coloured wires and twisting the bare wire ends together. Wrap each wire connection in electrical tape. Plug the aftermarket wiring harness into the vehicle's wiring harness by pushing them together. Plug the vehicle's antenna into an antenna adaptor. Plug the antenna adaptor into the identified location on the back of the aftermarket stereo.

Slide the aftermarket stereo into the metal sleeve connected to the mounting bracket and secure following the stereo's instructions. Press the plastic trim piece that surrounds the stereo back into place. Reattach the negative battery cable.


Failure to disconnect the vehicle's negative battery cable may result in electrical damage to the vehicle.

Tips and warnings

  • Failure to disconnect the vehicle's negative battery cable may result in electrical damage to the vehicle.

Things you need

  • Crescent wrench
  • Screwdriver
  • Aftermarket mounting bracket
  • Aftermarket wiring harness
  • Electrical tape
  • Antenna adaptor

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