2007 Lexus GS350 Service & Repair Manual
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2005-2007 LEXUS GS350
SERVICE AND REPAIR
MANUAL
HVAC
Air Conditioning - GS350/GS430
AIR CONDITIONING SYSTEM
PRECAUTION
SYSTEM REFERENCE
PARTS LOCATION
NOTE: When disconnecting the cable from the negative (-) battery terminal, initialize
the following systems after the cable is reconnected.
System Name See procedure
Power Window Control System
INITIALIZATION Intuitive Parking Assist System
Variable Gear Ratio Steering System
Fig. 1: Identifying Air Conditioning Components (1 Of 3)
Fig. 2: Identifying Air Conditioning Components (2 Of 3)
Fig. 3: Identifying Air Conditioning Components (3 Of 3)
SYSTEM DIAGRAM
Fig. 4: Air Conditioning System Diagram (1 Of 2)
Fig. 5: Air Conditioning System Diagram (2 Of 2)
Input signal to A/C amplifier:
TRANSMITTING ECU SIGNALS
Transmitting ECU
(transmitter)
Signals
Communication
Method
Front Door RH ECU Mirror heater operation signal BEAN
Front Door LH ECU Mirror heater operation signal BEAN
ECM Heater relay signal CAN
Output signal to A/C amplifier:
TRANSMITTING ECU SIGNALS
SYSTEM DESCRIPTION
1. GENERAL
a. The air conditioning system has the following features:
In compliance with the temperature set with the temperature control switch, the A/C
amplifier calculates the outlet temperature based on the input signals from various sensors. In
addition, corrections in accordance with the signals from the room humidity sensor and the
water temperature sensor are added to control the outlet air temperature.
Controls the blower motor in accordance with the airflow volume that has been calculated by
A/C amplifier based on the input signals from various sensors.
Automatically changes the outlets in accordance with the outlet mode ratio that has been
calculated by the A/C amplifier based on the input signals from various sensors.
ECM Magnetic clutch signal CAN
ECM Rear defogger relay operation signal CAN
ECM Idle up signal CAN
ECM A/C compressor signal CAN
ECM Prohibition of charge signal CAN
ECM Heater valve signal CAN
ECM Pressure sensor signal CAN
Distance Control ECU Ambient temperature signal CAN
Multi-display Ambient temperature signal AVC-LAN
Multi-display IND display signal AVC-LAN
Multi-display Buzzer signal AVC-LAN
Multi-display
Driver and passenger side set temperature
indication signal
AVC-LAN
Transmitting ECU (transmitter) Signals Communication Method
Combination Meter Vehicle speed signal BEAN
ECM Engine revolution speed signal CAN
ECM Water temperature signal CAN
ECM Ambient temperature signal CAN
ECM A/C compressor lock signal CAN
ECM A/C control cut signal CAN
ECM A/C compressor control signal CAN
Multi-display A/C operation signal AVC-LAN
Multi-display Rear defogger operation signal AVC-LAN
Multi-display Mirror heater operation signal AVC-LAN
Multi-display Wiper deicer operation signal AVC-LAN
Automatically controls the air inlet control damper in accordance with the airflow volume
that has been calculated by the A/C amplifier.
Based on the signals from the ambient temperature sensor, this control calculates the outside
temperature, which is then corrected in the air conditioning amplifier, and shown in the
multi-information display in the combination meter.
Turns the rear defogger and outside rear mirror heaters on for 15 minutes when the rear
defogger switch is pressed. Turns them off if the switch is pressed while they are operating.
The A/C amplifier automatically controls the air inlets based on the signals from the smog
ventilation sensor.
Checks the sensors in accordance with operation of the air conditioner switches.
HINT:
The smart connector has a built-in IC that enables communication with the A/C amplifier
servomotor driving and position detection.
The A/C amplifier equipped with the function of controlling the indicator lighting.
2. MODEL POSITION AND DAMPER OPERATION
Fig. 6: Identifying Model Position And Damper Operation
CONTROL DAMPER OPERATION CHART
Control Damper Control Position
Damper
Position
Operation
Air Inlet Control Damper
FRESH B Brings in fresh air.
RECIRC A Recirculates internal air.
Air Mix
Control Film
Driver and
Front
Passenger
MAX COOL to MAX
HOT (TEMP.
SETTING 18 to 32°C
C, D, E
Varies the mixture ratio of the fresh air
and the recirculation air in order to
regulate the temperature continuously
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Lifetime Access
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Print one or all pages of your manual
$36.99
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