Will the steering wheel controls still function if you change the stereo unit of toyota innova g variant?

im from the philippines, and planning to change my unit to a dvd player type, but still want the controls on the steering wheel to function.
Will the steering wheel controls still function if you change the stereo unit of toyota innova g variant?
if you put an aftermarket stereo, you'll lose the steering wheel controls UNLESS you purchase %26amp; install an aftermarket module to retain it

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