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Home >> Toyota >> 2020 >> RAV4 XLE, AWD >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 48 (Heating / Air Conditioning System (HV) - Diagnostics - Introduction (1 Of 2)) >> AIR CONDITIONING SYSTEM (for HV Model) >> System Description [02/2019 - 08/2020] >> System Description [02/2019 - 08/2020]

System Description [02/2019 - 08/2020]

WARNING: This page is about a different variant/trim than selected.
  1. COMMUNICATION SYSTEM FUNCTION 
    1. Air conditioning amplifier assembly transmits and receives the signals in each ECU via the CAN communication system and LIN communication system. Also, the air conditioning amplifier assembly transmits and receives the damper position, damper operation, sensor status, etc., signals to and from each actuator.
      AIR CONDITIONING AMPLIFIER ASSEMBLY ←→ AIRBAG ECU ASSEMBLY

      Receiver Sender Signal Communication Line
      Air conditioning amplifier assembly Airbag sensor assembly Front passenger's seat occupant status CAN
      Front passenger's seat belt buckle switch status
      AIR CONDITIONING AMPLIFIER ASSEMBLY ←→ MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)

      Receiver Sender Signal Communication Line
      Air conditioning amplifier assembly Main body ECU (multiplex network body ECU) Auto dimmer CAN
      Front passenger courtesy switch
      Rear courtesy switch LH
      Rear courtesy switch RH
      Country code 1st, 2nd, 3rd
      Steering wheel
      Solar data (R)
      Solar data (L)
      Humidity (w/ Glass Humidity Sensor)
      Windshield temperature
      Ambient temperature of humidity sensor
      Main body ECU (multiplex network body ECU) Air conditioning amplifier assembly Ambient temperature display CAN
      AIR CONDITIONING AMPLIFIER ASSEMBLY ←→ RACK AND PINION POWER STEERING GEAR ASSEMBLY (POWER STEERING ECU)

      Receiver Sender Signal Communication Line
      Rack and pinion power steering gear assembly (power steering ECU) Air conditioning amplifier assembly Ambient temperature display CAN
      AIR CONDITIONING AMPLIFIER ASSEMBLY ←→ COMBINATION METER ASSEMBLY

      Receiver Sender Signal Communication Line
      Air conditioning amplifier assembly Combination meter assembly Vehicle speed (meter to other) CAN
      Front passenger's seat occupant status
      Combination meter assembly Air conditioning amplifier assembly Ambient temperature display CAN
      Switch signal of 0 or 0.5 below decimal point of ambient temperature display
      A/C load limitation warning
      AIR CONDITIONING AMPLIFIER ASSEMBLY ←→ HYBRID VEHICLE CONTROL ECU ASSEMBLY

      Receiver Sender Signal Communication Line
      Air conditioning amplifier assembly Hybrid vehicle control ECU assembly ECO mode indicator CAN
      Driver mode select
      Battery maximum temperature
      State of STB (Standby)
      Compulsion recycle request
      Communication A/C inverter and HV ECU
      No electrical heater request
      A/C permission electric power
      Ready
      A/C inverter main voltage
      A/C inverter output
      Motor over load information
      Motor start information
      A/C inverter internal power source malfunction
      STB wire short
      A/C inverter temperature information
      Self check
      Thermistor cold temperature malfunction
      BTC down
      A/C motor revolution
      A/C input power
      A/C inverter temperature
      A/C-Inverter CPU error flag
      A/C-Inverter CPU initialization flag
      A/C inverter identification
      Engine type information 1 - 4
      HV flag
      ECO-run flag
      Hybrid vehicle control ECU assembly Air conditioning amplifier assembly Refrigerant gas pressure sensor CAN
      In-vehicle temperature
      Heating performance assistance request to transmission system
      Heater idle up request
      Front blower level indicator
      ECO switch information
      Engine on request
      Charging control inhibit
      Electro motion compressor target revolutions
      Ambient temperature before correction
      Ambient temperature display
      Electro motion compressor start
      Prior A/C control request
      Standby for inverter request
      Inlet state (for cooling battery)
      A/C control state
      AIR CONDITIONING AMPLIFIER ASSEMBLY ←→ ECM

      Receiver Sender Signal Communication Line
      Air conditioning amplifier assembly ECM Engine speed data CAN
      Voltage of accessory battery
      Compulsory internal air circulation command signal at high water temperature
      Water temperature
      ECM Air conditioning amplifier assembly Heating performance assistance request to transmission system CAN
      Motor cooling fan drive request
      Heater idle up request
      Ambient temperature before correction
      Ambient temperature display
      Prior A/C control request
      AIR CONDITIONING AMPLIFIER ASSEMBLY ←→ INVERTER WITH CONVERTER ASSEMBLY

      Receiver Sender Signal Communication Line
      Inverter with converter assembly Air conditioning amplifier assembly Ambient temperature before correction CAN
      Ambient temperature display
      Prior A/C control request
      AIR CONDITIONING AMPLIFIER ASSEMBLY ←→ AIR CONDITIONING CONTROL ASSEMBLY

      Receiver Sender Signal Communication Line
      Air conditioning amplifier assembly Air conditioning control assembly Independent control A/C information LIN
      AUTO switch operation
      OFF switch operation
      A/C switch operation
      ECO switch operation
      Blower switch operation
      S-FLOW switch operation
      Auto/manual identification information
      Air outlet switch operation
      DUAL switch operation
      Driver side set temperature switch operation
      Heater/cooler identification information
      Front passenger side set temperature switch operation
      Recirculation/fresh switch operation
      S-FLOW select information
      Blower customize select information
      Air conditioning control assembly Air conditioning amplifier assembly S-FLOW display instruction LIN
      Blower customize display instruction
      ECO display instruction
      Entire front panel display instruction
      AUTO display instruction
      Blower level display instruction
      Recirculation display instruction
      Air outlet display instruction
      DUAL display instruction
      Driver side set temperature display instruction
      Front passenger side set temperature display instruction
      A/C display instruction
      AIR CONDITIONING AMPLIFIER ASSEMBLY ←→ DAMPER SERVO

      Receiver Sender Signal Communication Line
      Air conditioning amplifier assembly No. 1 air conditioning radiator damper servo sub-assembly Damper arm position LIN
      No. 2 air conditioning radiator damper servo sub-assembly
      No. 3 air conditioning radiator damper servo sub-assembly (w/ Driver Seat Centralized Control)
      No. 1 blower damper servo sub-assembly
      No. 1 air conditioning radiator damper servo sub-assembly Air conditioning amplifier assembly Damper arm position LIN
      No. 2 air conditioning radiator damper servo sub-assembly
      No. 3 air conditioning radiator damper servo sub-assembly (w/ Driver Seat Centralized Control)
      No. 1 blower damper servo sub-assembly
      AIR CONDITIONING AMPLIFIER ASSEMBLY ←→ BLOWER MOTOR, SENSOR, SWITCH ETC.

      Receiver Sender Signal Communication Line
      Air conditioning amplifier assembly Cooler thermistor (room temperature sensor) Sensor value Direct line
      Thermistor assembly
      Air conditioner pressure sensor
      No. 1 cooler thermistor
      Integration control and panel assembly ECO switch
      Blower with fan motor sub-assembly Air conditioning amplifier assembly Drive Direct line
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