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E46 Climate Control
System Components
The E46 IHKR consists of the following components:
• IHKR control unit with operating controls
• IHKR integrated heater and air conditioning case
• Heater core temperature sensor
• Evaporator temperature sensor
• Refrigerant circuit pressure sensor
• Double cage blower motor and final stage
• Water valve
• Air distribution micro-switch
• M-bus with 3 smart stepper motors:
- Air distribution
- Fresh air/re-circulation left (high speed motor)
- Fresh air/re-circulation right (high speed motor)
• Compressor relay (DME controlled)
• Auxiliary fan (DME controlled)
• Rear window defroster relay
• K-bus interface
The following signals are transmitted and received over the K-bus:
- Vehicle speed
- Engine speed
- Coolant temperature
- Outside temperature
- Terminal 15, 61, 50,58G (panel lighting)
- Compressor load
- Diagnosis and coding
- Compressor request
• Fresh air Micro-filter
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