To unlock the IHKR A/C Switch, one needs to use two pieces of plastic prying tools and remove it, disconnect the electrical harness connectors and the Bowden cables at the back side of the switch with attention to the colors. Some included cables that need to be connected to proper control levers during the installation process during the reinstallation the same cables may also need to be properly connected for the machine to perform the intended function. For the IHKA, open the A/C Switch, using a plastic prying tool utilised in BMW, but if one is not available, any similar thin plastic such as a credit card will suffice. Remove the module harness connector by unlocking the connector lock by inserting a thin screwdriver by the connector lock on both sides to unlock it.