More and more automobiles are being produced with SWC's (steering wheel controls). This functionality is a useful and convenient component in audio controls for the driver. A re-occurring problem is when you want to install an in dash aftermarket GPS unit. It really is a waste if your new unit isn't compatible with your OEM functionality.
So how can we make sure that the SWC's work correctly with an aftermarket GPS unit?
First, it is suggested that you refer to your favorite information site to gather the SWC wire location, color and resistance to make sure that the factory SWC will be compatible with the new aftermarket navigation system. Most wire diagram sites will state whether the SWC in the vehicle is negative, positive or data based.
wire. Most of the time, you will only be using the ground and the Wheel 1 input. There are exceptions. Some Nissan vehicles have two trigger wires, so the Wheel Input 2 wire will connect to the second SWC wire in the factory radio harness.
Based on this information, newer single and double Din GPS units should easily integrate with your steering wheel controls.
If your aftermarket in dash unit is not compatible, you will need to purchase an SWC interface, which is a adapter that allows you to retain your OEM functions after the aftermarket stereo is installed. This installation process is relatively simple, and with a little bit of planning and research on your car's stereo components, it should work just as well.
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