DSD Information System
Home >> Toyota >> 2021 >> Highlander LE, 4WD >> Repair and Diagnosis >> Heating, Ventilation & A/C (HVAC) >> HVAC Control Systems >> Heating / Air Conditioning System (Except HV, W/ Auto A/C) - Diagnostics - Introduction >> AIR CONDITIONING SYSTEM (for Gasoline Model with Automatic Air Conditioning System) >> System Description [10/2022 - 11/2023] >> System Description [10/2022 - 11/2023]

System Description [10/2022 - 11/2023]

  1. COMMUNICATION SYSTEM FUNCTION 
    1. The air conditioning amplifier assembly communicates with each ECU via CAN communication and LIN communication. 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 ←→ MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)

      Receiver Sender Signal Communication Line
      Air conditioning amplifier assembly Main body ECU (multiplex network body ECU) BDB1S01 sub ID CAN
      Auto dimmer
      Passenger's seat courtesy SW
      Rear right side courtesy SW
      Rear left side courtesy SW
      BDB1S03 sub ID
      High beam head lamp request
      Low beam head lamp request
      BDB1S08 sub ID
      Destination symbol
      Country code 1st
      Country code 2nd
      Country code 3rd
      Steering wheel
      Solar data (R)
      Solar data (L)
      Humidity
      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 ←→ COMBINATION METER ASSEMBLY

      Receiver Sender Signal Communication Line
      Air conditioning amplifier assembly Combination meter assembly MET1S01 sub ID CAN
      Vehicle speed (meter to other)
      MET1S08 sub ID
      Passenger presence
      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 ←→ AIRBAG SENSOR ASSEMBLY

      Receiver Sender Signal Communication Line
      Air conditioning amplifier assembly Airbag sensor assembly Passenger's seat occupant status CAN
      Passenger's seat belt buckle switch status
      AIR CONDITIONING AMPLIFIER ASSEMBLY ←→ POWER STEERING ECU (RACK AND PINION POWER STEERING GEAR ASSEMBLY)

      Receiver Sender Signal Communication Line
      Air conditioning amplifier assembly Power steering ECU (rack and pinion power steering gear assembly) Loading control level CAN
      Power steering ECU (rack and pinion power steering gear assembly) Air conditioning amplifier assembly Ambient temperature display CAN
      AIR CONDITIONING AMPLIFIER ASSEMBLY ←→ DCM (TELEMATICS TRANSCEIVER)

      Receiver Sender Signal Communication Line
      Air conditioning amplifier assembly DCM (telematics transceiver) YGW1S01 sub ID CAN
      Remote E/G start system control
      YGW1S02 sub ID
      Defogger control
      Air conditioner control
      DCM (telematics transceiver) Air conditioning amplifier assembly Drive recorder ACN01 CAN
      Drive recorder ACN02
      Drive recorder ACN03
      Drive recorder ACN04
      Drive recorder ACN05
      Drive recorder ACN06
      Drive recorder ACN07
      Drive recorder ACN08
      A/C warning on-screen request
      DEF INDICATOR
      A/C INDICATOR
      Indicator signal that shows concentration on one seat
      Dr TEMPERATURE display
      In-vehicle temperature
      Ambient temperature display
      A/C control state
      AIR CONDITIONING AMPLIFIER ASSEMBLY ←→ ENGINE STOP AND START ECU (W/ STOP AND START SYSTEM)

      Receiver Sender Signal Communication Line
      Air conditioning amplifier assembly Engine Stop and Start ECU ECO-run control mode CAN
      ECO-run cancel lamp lighting request
      S&S A/C mode
      Engine Stop and Start ECU Air conditioning amplifier assembly Engine ON request CAN
      Water pump request
      Ambient temperature display
      AIR CONDITIONING AMPLIFIER ASSEMBLY ←→ ECM

      Receiver Sender Signal Communication Line
      Air conditioning amplifier assembly ECM Drive mode select CAN
      Engine type information 1
      Engine type information 2
      Engine type information 3
      Engine type information 4
      HV flag
      ECO-run flag
      Engine RPM data
      Water temperature
      Alternative field duty value
      Deicer inhibit
      A/C control cut-off 5
      A/C control cut-off 4
      A/C control cut-off 3
      A/C control cut-off 2
      A/C control cut-off 1
      Variable control inhibition
      Number of PTC heater which is permitted
      Voltage of accessory battery
      Compulsory internal air circulation command signal at high water temperature
      ECM Air conditioning amplifier assembly Magnet clutch request CAN
      A/C idleup request
      Heater idleup request
      Charging control inhibit
      Prior A/C control request
      Acceleration cut inhibit
      PTC heater control request
      Generator control inhibit
      Cooling performance assistance request signal to transmission system
      Request control by refrigerant
      Heating performance assistance request signal to transmission system
      Ambient temperature before correction
      Refrigerant information
      The first advancement evaporator temperature
      Variable compressor solenoid current
      Refrigerant gas pressure sensor
      Rr DEF drive request
      EHW (left) drive request
      Ambient temperature display
      AIR CONDITIONING AMPLIFIER ASSEMBLY ←→ AIR CONDITIONING CONTROL ASSEMBLY

      Receiver Sender Signal Communication Line
      Air conditioning amplifier assembly Air conditioning control assembly Auto operation switch LIN
      OFF operation switch
      A/C operation switch
      Fr blower operation switch [push type]
      SFLW operation switch
      AUTO/MANUAL identifier information
      D outlet operation switch [push type]
      DEF operation switch
      Rr DEF operation switch
      DUAL SYNC operation switch
      Deicer operation switch
      Deicer switch variation
      Dr set temperature operation switch [pulse type]
      Pa set temperature operation switch [pulse type]
      Inlet operation switch 2
      REAR operation switch
      R set temperature operation switch [push type]
      WITH OR WITHOUT S-FLOW FUNCTION
      DUAL/SYNC IDENTIFICATION INFORMATION
      Rr panel mode SW
      Part number information 1
      Part number information 2
      Part number information 3
      Part number information 4
      Part number information 5
      Air conditioning control assembly Air conditioning amplifier assembly SFLW indicator LIN
      Wiper deicer indication
      Front panel all indicator
      AUTO indicator
      Blower level indicator
      REC indicator
      D seat mode indicator
      RDEF indicator
      DUAL/SYNC indicator
      D setting temperature indicator
      P setting temperature indicator
      Dimming
      A/C indicator
      Rr blower level indicator
      Rr AUTO indicator
      Rr SYNC indicator
      Rr ON indicator
      Rear indicator
      Rr R seat mode indicator
      Rr R setting temperature indicator
      AIR CONDITIONING AMPLIFIER ASSEMBLY ←→ NO. 2 AIR CONDITIONING CONTROL ASSEMBLY

      Receiver Sender Signal Communication Line
      Air conditioning amplifier assembly No. 2 air conditioning control assembly Auto operation switch LIN
      AUTO/MANUAL identification information
      OFF operation switch
      Rear blower operation switch
      RR outlet operation switch
      RR setting temperature switch
      Part number information 1
      Part number information 2
      Part number information 3
      Part number information 4
      Part number information 5
      No. 2 air conditioning control assembly Air conditioning amplifier assembly Rear panel all indicator LIN
      AUTO indicator
      Blower level indicator
      RR seat mode indicator
      RR setting temperature indicator
      Dimming
      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 position signal LIN
      No. 1 blower damper servo sub-assembly
      Rear air mix damper servo sub-assembly
      Rear mode damper servo sub-assembly
      No. 1 air conditioning radiator damper servo sub-assembly Air conditioning amplifier assembly LIN
      No. 1 blower damper servo sub-assembly
      Rear air mix damper servo sub-assembly
      Rear mode damper servo sub-assembly
      AIR CONDITIONING AMPLIFIER ASSEMBLY ←→ BLOWER MOTOR, SENSOR, SWITCH, ETC.

      Receiver Sender Signal Communication Line
      Air conditioning amplifier assembly Room temp. sensor (cooler thermistor) Sensor value signal Direct line
      No. 2 room temp. sensor (cooler thermistor)
      Ambient temp. sensor (thermistor assembly)
      Air conditioner pressure sensor
      Evaporator temp. sensor (No. 1 cooler thermistor)
      Rear evaporator temp. sensor (No. 2 air conditioning harness assembly)
      Blower motor with fan sub-assembly Drive signal
      Rear blower motor control Drive signal
      Air conditioning amplifier assembly PTC HTR relays Quick heater assembly operation signal
      Compressor with pulley assembly SOL terminal signal
      Blower motor with fan sub-assembly Air conditioning amplifier assembly Drive signal Direct line
      Rear blower motor control Drive signal
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