There's two things reqd
As stated above, the correct display in the instrument cluster and even then (if it has correct display) the correct RH or Offside (in uk) wing mirror ( 3 mirror types, Manual non elec, elec & heated, elec, heated and ext temp sensor)
If you flip up the window & mirror adj panel on drivers door, there's 2 elec block connectors should be in the vertical position, assuming your mirror is electric adjust, one block connector will be connected, if temp sensor mirror, both connectors connected,
If you have the correct display and mirror the option needs turning on in the ECU using
multiecuscan