2012 911 Section 8-1 11/3/11 10:28 AM Page 210
911 Carrera 911 Carrera S
Heating and air conditioning
8
8.6 Topology of the air-conditioning system The control unit of the air-conditioning system (Operating and Air-Conditioning Unit) communicates with other control units via CANMMI and with external devices and sensors via the LIN bus. The blower and flaps on the heater as well as the air quality sensor on the air intake tube housing are activated via the LIN bus.
Diagnosis 500 kbps
Gateway
Drive 500 kbps
Chassis 500 kbps CDR-31 Comfort 500 kbps PCM 3.1
MOST 20 Mbps Man Machine Interface
OAU
AQS
Crash risks 500 kbps
LIN 19.8 kbps
LIN
Heater unit
Sun sensor
Xi
Switch module
8_33_11
Control units connected to the CAN MMI (e.g. instrument cluster)
OAU Operating and Air-conditioning Unit
The air-conditioning compressor is activated directly via a PWM (pulse width modula-
AQS Air quality sensor
tion) signal and is therefore not included in the topology.
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cardiagn.com
Xi
