Air Distribution, IHS and IHKS

Air Distribution, IHS And IHKS

Air distribution, IHS and IHKS
This functional description covers the air distribution of the IHS and of the IHKS.

Brief description of components

Air-distribution control wheel







Air distribution flap mechanical system and air distribution flap motor
Air distribution is carried out by the air distribution flap, which in turn is adjusted by the air distribution flap mechanical system. The mechanical system is driven by the air distribution flap motor.
The air distribution flap motor has no detection of its current position. For this reason, the flap motor must be activated depending on a reference position. This enables exact and reproducable positioning.

System functions

Reference run of the air distribution flap motor
The reference position is an end position of the air distribution flap. Evaluation of the flap motor load current indicates the end position.
The reference run is carried with every "power on reset". It can also be triggered by the BMW diagnosis system.

Setting the air distribution
The air distribution is set manually using the air-distribution control wheel. Depending on the set position, the air distribution flap motor moves the air distribution flap to the desired position.

Air distribution approximate position of the air distribution flap
BOTTOM 0 %
top-bottom 11 %
Defrost 28 %
MIDDLE 44 %
top-centre-bottom 72 %

Notes for Service department
Observe the following information for service:

Coding and programming
- Coding
When coding the vehicle-specific data, the following details (among others) are taken into account:
- Engine variant (diesel engine or petrol engine)
- Version of the control unit

- Programming
Flash programming of control unit via the K-CAN is possible.

Country-specific versions
The temperature display can be switched to °C or °F using the on-board computer function.
No liability can be accepted for printing or other errors. Subject to changes of a technical nature