Stratified Air
The request for air temperature stratification is made by a thumbwheel located in the front center face vent outlet and the rear passenger console outlet (if equipped). The thumbwheel potentiometer receives power and ground from the IHKA control module which also monitors the variable return voltage. In addition, the rear console outlet contains a micro-switch (on/off request) that signals to the IHKA control module to allow air flow to the rear console.