1. Disconnect the wire from the terminal «minus» battery.
2. Remove the control unit for the heating, air conditioning and ventilation system assembly with a decorative overlay (see «Removal and installation of the control unit for the heating, air conditioning and ventilation system»).
3. On the inside of the control unit cover, unscrew the screws that secure the corresponding switch...
4.... and remove the switch.
5. Install the parts in the reverse order of removal.