IHKA control unit

For the first time, the IHKA control unit is connected directly to the heating and air-conditioning unit.

The integrated heating and air conditioning system (IHKA) is operated using the operating elements in the control box. The nominal temperature is set on the control panel separately for the driver's side and passenger's side. The IHKA control unit regulates the climate control to the desired temperature. In doing so, the IHKA control unit picks up the sensor signals and continuously adapts the control variables for delivery temperature and blower output.

The seat heating and heated rear window continue to be operated by buttons in the control panel.

The control unit for the integrated automatic heating/air conditioning system (IHKA control unit) is a bus user on the LIN bus and K-CAN. The front electronic module (FEM) supplies the IHKA control unit using terminal 30F and load earth.

Fig 1: Identifying IHKA Control Unit Components

Courtesy of BMW OF NORTH AMERICA, INC.