Stepper Motor M-Bus Control - BMW E46 Manual
Climate control
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Also See for E46:
- Manual (2 pages) ,
- Installation instructions manual (23 pages) ,
- User manual (32 pages)
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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.
9
E46 Climate Control
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