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E46 Climate Control
Review Questions
8. What is the Voltage range of the control signal from the IHKR to the blower final stage?
9. Which components are responsible for the movement of the air distribution flaps? What
role does the air distribution micro-switch play? (IHKR system)
10.How does the IHKR determine a Y-factor if the system does not use an interior
temperature sensor?
11.How does the IHKR signal the DME when compressor activation is requested? Discuss
what information is exchanged.
12.What three stepper motors are located on the IHKR M-Bus? What is an M-Bus?
13.Which additional component is used in the rear defrost circuit of a convertible E46, as
compared to a hard top?
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