Air conditioning control box
New: The heating and air conditioning system control box is no longer an element of the control unit. The control box is connected to the IHKA control unit through the local interconnect network bus. The control box is supplied by the IHKA control unit using terminal 30F and electronics earth (ground).
The control box connection depends on vehicle equipment levels:
- BMW Business radio:
The heating and air conditioning system control box is directly connected to the IHKA control unit.
- BMW Professional radio and navigation system
The heating and air conditioning system control box is connected to the IHKA control unit through the audio system control box.
Follow diagnosis wiring diagrams!
| Item | Explanation |
|---|---|
| A | Front |
| B | Rear |
| 1 | Audio control box |
| 2 | Heating and air conditioning system control box |
| 3 | 4-pin plug connection |
| 4 | 4-pin plug connection |
The control boxes evaluate the operation of the operating elements and transmit the information via the local interconnect network bus to the IHKA control unit.