System Description

WARNING: This page is about a different car, the 2008 Lexus RX 350. However, it is still accessible from the selected car via links, so may be relevant.

General
The air conditioning system has the following features:
- A compact, lightweight, and highly efficient electrical water pump is used in order to ensure the proper heater performance while the engine is stopped.
- A left / right independent temperature control and neural network control have been adopted to make air conditioner control available to suit the perception of the persons in the driver seat and in the passenger seat. Automatic air conditioner is standard in all models.
- A left/right independent temperature control and neural network control have been adopted to make air conditioner control available to suit the perception of the persons in the driver seat and in the passenger seat. Automatic air conditioner is standard in all models.
- A semi-center location air conditioner unit, in which the evaporator and heater core are placed in the vehicle's longitudinal direction, is used.
- A compact, lightweight, and highly efficient straight flow (full-path flow) aluminum heater core is used.
- A revolutionary slim structure evaporator is used.
- A humidity sensor function has been added to the room temperature sensor in order to optimize the amount of dehumidification effort during the operation of the air conditioning system.
- A deodorizing function that eliminates the exhaust gas smell that enters the cabin from the outside has been added to the conventional clean air filter.
- The air conditioning ECU is equipped with a self-diagnosis function. If there is a malfunction in the system, it stores the DTCs (Diagnostic Trouble Codes) in its memory.

Mode Position and Damper Operation

Fig 1: Mode Position And Damper Operation Diagram

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Function of Main Damper:

MAIN DAMPER FUNCTION CHART

Control Damper

Control Position

Damper Position

Operation

Air Inlet Control Damper

FRESH

Brings in fresh air.

RECIRCULATION

Recirculates internal air.

Air Mix Control Damper (Left / Right Independent Control)

MAX COLD - MAX HOT TEMP. SETTING (18°C(65°F)-32°C (89.6°F))

C - D - E

Varies the mixture ratio of the cool air and the warm air in order to regulate the temperature continuously from HOT to COLD.

Mode Control Damper

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

F, K, L, P, S

Defrosts the windshield through the center defroster, side defroster, side registers and rear center register.

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

G, K, L, P, Q

Defrosts the windshield through the center defroster, side defrosters, side registers and rear center register, while air is also blown out from the front and rear foot well register ducts.

H⁽¹⁾,⁽²⁾, K, L, P, Q

Air blows out of the front and rear foot well register ducts, side registers, and rear center register. Furthermore, when the damper is set to FOOT in the AUTO mode, a slight amount of air also flows from the register.

I, K, N, P, R

Air blows out of the front and rear center registers, side registers, and front and rear foot well register ducts.

I, J, M, 0, S

Air blows out of the front and rear center registers, and side registers.

⁽¹⁾	Auto FOOT Mode

⁽²⁾	Manual FOOT Mode

Air Outlets and Air Volume Rations

Fig 2: Identifying Air Outlet Position Symbols
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Fig 3: Air Outlet Position Symbols Chart
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

The size of the circle O indicates the proportion of airflow volume.