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System Diagram

WARNING: This page is about a different car, the 2008 Lexus LS 600hL. However, it is still accessible from the selected car via links, so may be relevant.
Fig 1: Air Conditioning System Diagram
G05774202Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Communication table 

COMMUNICATION CHART

Transmitter Receiver Signal Communication Line
Air conditioning amplifier ECM
  • A/C compressor control signal
  • Idle up request signal
  • External variable control solenoid current signal
  • Cooling fan motor driving request signal
  • PTC heater driving number request signal
 CAN
Air conditioning amplifier Front controller
  • Rear defogger relay drive signal (Mirror heater operation control)
  • Windshield deicer relay drive signal
 CAN
Air conditioning amplifier No 1 meter ECU
  • Ambient temperature signal
 CAN
Air conditioning amplifier Display and navigation assembly*1, multi-display*2, *3
  • IND display signal
  • Set temperature indication signal
  • Ambient temperature signal
  • Buzzer signal
 CAN
Air conditioning amplifier Rear power seat module (Rear A/C control panel)
  • IND display signal
  • Set temperature indication signal
  • Ambient temperature signal
  • Buzzer signal
 LIN
Air conditioning amplifier Hybrid vehicle control ECU
  • State of STB
  • Compulsion recycle request signal
  • A/C inverter and HV control ECU communication signal
  • No electrical heater request signal
  • A/C inverter main voltage signal
  • A/C inverter output signal
  • Motor overload information
  • Motor start information
  • A/C inverter power source malfunction
  • STB wire short
  • A/C inverter temperature
  • Battery cooling fan voltage
  • A/C motor revolution signal
  • A/C input power signal
  • A/C motor current request
  • A/C inverter voltage signal
 CAN
ECM Air conditioning amplifier
  • Engine revolution speed signal
  • Engine coolant temperature signal
  • A/C control cut signal
  • Variable control prohibition signal
  • PTC heater permission number
 CAN
Front controller Air conditioning amplifier
  • Ambient temperature signal
  • Pressure sensor signal
  • Smog ventilation sensor signal
 CAN
Rear junction block ECU Air conditioning amplifier
  • Rear solar sensor signal
  • Rear magnetic valve signal
  • Smoke sensor signal
 CAN
No 1 meter ECU Air conditioning amplifier
  • Vehicle speed signal
 CAN
Display and navigation assembly*1, multi-display*2, *3 Air conditioning amplifier
  • A/C operation signal
  • Rear A/C operation signal
  • Rear defogger operation signal
  • Windshield deicer operation signal
  • Mirror heater operation signal
 CAN
Rear power seat module (Rear A/C control panel) Air conditioning amplifier
  • Rear A/C operation signal
 LIN
Rear door ECU LH Air conditioning amplifier
  • Rear temperature sensor LH signal
 CAN
Rear door ECU RH Air conditioning amplifier
  • Rear temperature sensor RH signal
 CAN
Hybrid vehicle control ECU Air conditioning amplifier
  • Heater idle up request signal
  • Engine ON request signal
  • Outside temperature data
  • Water pump ON/OFF request signal
  • Prior A/C control request signal
  • A/C control state signal
  • Inlet state signal
  • Standby for inverter request signal
  • Electromotion compressor start signal
  • Electromotion compressor target revolution signal
 CAN
HINT:
  • *1: w/ Navigation System (for HDD)
  • *2. w/ Navigation System (for DVD)
  • *3 w/o Navigation System
Fig 2: Air Conditioning System Diagram (1 Of 4)
G05774203Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
Fig 3: Air Conditioning System Diagram (2 Of 4)
G05774204Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
Fig 4: Air Conditioning System Diagram (3 Of 4)
G05774205Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
Fig 5: Air Conditioning System Diagram (4 Of 4)
G05774206Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
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