BMW E46 User Manual

STEPPER MOTOR M-BUS CONTROL
The E46 uses the M-Bus for stepper motor control. All five stepper motors of the IHKA
are bus controlled including:
• Two fresh air/recirc-air flap motors
• Face vent flap motor
• Footwell flap motor
• Defrost flap motor
Due to the requirement for a fast acting motor for the fresh/recirc flaps, two different step-
per motors (slow/fast) are used in the system.
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E46 Climate Control

BMW E46 Specifications

General

Brand	BMW
Model	E46
Category	Temperature Controller
Language	English