2003 LEXUS LS430 Factory Repair Manual

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Page 210 of 4500

LEXUS LS430 2003 Factory Repair Manual Fig. 6: Air Conditioning System Diagram (2 Of 2)
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
1.GENERAL
a. The air conditioning system has the following features:
In compliance with the temperature

Fig. 6: Air Conditioning System Diagram (2 Of 2)
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
1.GENERAL
a. The air conditioning system has the following features:
In compliance with the temperature set at the temperature control switch, the neural network
control calculates the outlet temperature based on the input signals from various sensors. In
addition, corrections in accordance with the signals from the evaporative temperature sensor
and the water temperature sensor are added to control the outlet air temperature.
Controls the front and rear blower motors in accordance with the airflow volume that has
been calculated by the neural network control based on the input signals from various
sensors.
Automatically switches the outlets in accordance with the outlet mode ratio that has been
calculated by the neural network control based on the input signals from various sensors.
Automatically controls the air inlet control damper in accordance with the airflow volume
that has been calculated by the neural network control.
Turns the compressor on/off and controls the discharge capacity based on the signals from
various sensors.
Based on the signals from the ambient temperature sensor, this control calculates the outside
temperature, which is then corrected in the air conditioner ECU, and shown in the multi-
information display in the combination meter.
Switched the rear defogger and outside rear view mirror heaters on for 15 minutes when the
rear defogger switch is switched on. Switched them off if the switch is pressed while they are
operating.
Controls the orientation and the angle of the front center register based on the input signals
from various sensors and on the outlet mode.
Determines whether the clean air filter (for the front A/C) is clogged by monitoring the air
inlets, and airflow volume.
The A/C amplifier automatically controls the air inlets based on the signals from the smog
ventilation sensor.
Improves the air quality by linking the air inlet control damper and the blower motor (for the
rear A/C and air purifier), based on the signals from the exhaust gas sensor and the smoke
sensor.
Checks the sensors in accordance with operation of the air conditioner switches.
2.MODEL POSITION AND DAMPER OPERATION

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LEXUS LS430 2003 Factory Repair Manual Fig. 7: Identifying Model Position And Damper Operation (Front Air Conditioning)
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

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LEXUS LS430 2003 Factory Repair Manual Fig. 8: Identifying Model Position And Damper Operation (Rear Air Conditioning And Air
Purifier)
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
3.AIR OUTLETS AND AIR VOLUME RATIONS

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LEXUS LS430 2003 Factory Repair Manual Fig. 9: Identifying Air Outlets And Air Volume Rations
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

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LEXUS LS430 2003 Factory Repair Manual The hand-held tester can be used in steps 3, 6, 7 and 11.
1.VEHICLE BROUGHT TO WORK SHOP
2.(SEE CUSTOMER PROBLEM ANALYSIS CHECK
)
a. Confirm problem symptoms.
3.CHECK AND CLEAR THE DTCS (SEE DTC

Page 215 of 4500

LEXUS LS430 2003 Factory Repair Manual 14.PARTS INSPECTION
15.REPAIR
16.CONFIRMATION TEST
END
Fig. 10: Customer Problem Analysis Check Sheet
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
1.LIST OF OPERATION METHODS

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LEXUS LS430 2003 Factory Repair Manual By operating each of the A/C control switches as shown in the diagram below, it is possible to enter the
diagnostic check mode.
Fig. 11: Operation Methods Chart

Courtesy of TOYOTA MOTOR SALES, U.S

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