Manual air conditioning system : Component Part Location

1. BCM
• With Intelligent Key: Refer to BCS- 6, "BODY CONTROL SYSTEM : Component Parts Location".

• Without Intelligent Key: Refer to BCS-161, "Removal and Installation".

2. Magnet clutch
3. Refrigerant pressure sensor 4. ECM
• HR16DE: Refer to EC-455, "ENGINE CONTROL SYSTEM : Component Parts Location".

• MR16DDT: Refer to EC-25, "ENGINE CONTROL SYSTEM : Component Parts Location".

• K9K: Refer to EC-813, "Component Parts Location".

5. IPDM E/R
• With Intelligent Key: Refer to PCS- 5, "Component Parts Location".

• Without Intelligent Key: Refer to PCS-37, "Component Parts Location".

6. A/C control
7. Blower fan resistor
8. Thermo control amp.
9. Blower motor

A. Left side of A/C unit assembly B. Right side of A/C unit assembly

Manual air conditioning system : Component Description

PTC heater control system : Component Parts Location

1. BCM
• With Intelligent Key: Refer to BCS- 6, "BODY CONTROL SYSTEM : Component Parts Location".

• Without Intelligent Key: Refer to BCS-161, "Removal and Installation".

2. Ambient sensor
3. ECM Refer to EC-813.

4. A/C control
5. PTC heater
6. PTC heater control unit

A. Left side of A/C unit assembly B. Back side of A/C unit assembly

PTC heater control system : Component Description

A/C unit assembly : Thermo Control Amp.

• Thermo control amp. is composed of thermistor and amplifier. Thermistor is installed on evaporator, and amplifier is attached to foot duct.

• When the thermistor detecting temperature of the evaporator fin is extremely low, thermo control amp. sends the thermo control amp. OFF signal to BCM, and stops the compressor.

A/C unit assembly : Blower Motor

• The blower motor utilizes a brush-less motor with a rotating magnet.

• Quietness is improved over previous motors where the brush was the point of contact and the coil rotated.

A/C unit assembly : Blower Fan Resistor

• Compact and lightweight resistor is adopted with outstanding ventilation.

• Temperature fuse is installed to protects the blower motor circuit.

A/C unit assembly : PTC Heater Control Unit

• The PTC heater control unit consists of a microcomputer and connectors for signal input and output and for power supply. The PTC heater control unit controls PTC heater system.

• Self-diagnosis functions are also built into PTC heater control unit to provide quick check of malfunctions in the PTC heater control system.

A/C unit assembly : PTC Heater

Heat element is heated and air flow temperature is increased by power supply from PTC relay.

A/C Control

Controls the air conditioning function.

BCM

BCM transmits A/C ON signal and blower fan ON signal to ECM via CAN communication, according to A/C switch signal and blower fan ON signal that are received from A/C control and thermo control amp. signal that is received from thermo control amp. and A/C indicator is turned ON.

ECM

ECM, when receiving A/C ON signal and blower fan ON signal from BCM, transmits A/C compressor request signal to IPDM E/R via CAN communication according to status of the engine and refrigerant pressure.

IPDM E/R

A/C relay is integrated in IPDM E/R. IPDM E/R operates A/C relay when A/C compressor request signal is received from ECM via CAN communication line.

Ambient Sensor

Ambient sensor measures ambient air temperature. The sensor uses a thermistor which is sensitive to the change in temperature. The electrical resistance of the thermistor decreases as temperature increases.

Refrigerant Pressure Sensor

DESCRIPTION

• The refrigerant pressure sensor converts high-pressure side refrigerant pressure into voltage and outputs it to ECM.

• ECM operates cooling system protection and idle speed control according to voltage value that is input.

STRUCTURE AND OPERATION

• The refrigerant pressure sensor is a capacitance type sensor. It consists of a pressure detection ares and a signal processing area.

• The pressure detection area, which is a variable capacity condenser, changes internal static capacitance according to pressure force.

• The signal processing area detects the static capacitance of the pressure detection area, converts the static capacitance into a voltage value, and transmits the voltage value to ECM.

Magnet Clutch

Compressor is driven by the magnet clutch which is magnetized by electric power supply.