Air Conditioning System (For Manual Air Conditioning System) System Description

The air conditioning system has the following controls.

Mode Position and Damper Operation

1. Front Air Conditioning Unit
   

   
   
   
   
   

   Function of Main Damper

   Control Damper	Operation Position	Damper Position	Operation
   Air Inlet Control Damper	Fresh	A	Brings in fresh air.
   	Recirculation	B	Recirculates internal air.
   Air Mix Control Damper	MAX COOL to MAX HOT	E - D - C	Varies the mixture of cold air and hot air in order to regulate the temperature continuously from hot to cool.
   MAX COOL Damper	MAX COOL	V	Open in the MAX COOL position.
   	Except MAX COOL	W	Close in all position except MAX COOL position.
   MAX HOT Damper	MAX HOT	Y	Open in the MAX HOT position.
   	Except MAX HOT	X	Closed in all position except MAX HOT position.
   Mode Control Damper	Face	F, I, N, T, X	Air blows out of the front center registers, side registers and rear face registers.
   	Bi-level	G, L, N, T, X	Air blows out of the front center registers, side registers, rear face registers and front and rear footwell register ducts.
   	Foot	H, M, P, T, W, Y (MAX HOT position) H, M, O, T, X (Except MAX HOT position)	Air blows out of the front and rear footwell register ducts. In addition, air blows out slightly from the front defroster, side registers, front center registers and rear face registers.
   	Foot/Def	H, K, R, T, W, Y (MAX HOT position) H, M, Q, T, X (Except MAX HOT position)	Defrosts the windshield through the front defroster and side registers while air is also blown out from the front and rear footwell register ducts. In addition, air blows out slightly from the front center registers and rear face registers.
   	Def	H, I, S, U, X	Defrosts the windshield through the front defrosters.





2. Rear Air Conditioning Unit (w/ Rear Air Conditioning System)
   

   
   
   
   
   

   Function of Main Damper

   Control Damper	Operation Position	Damper Position	Operation
   Mode Control Damper	Face	A	Air blows out from the rear roof registers.
   	Bi-level	B	Air blows out from the rear roof registers and rear side registers.
   	Foot	C	Air blows out from the rear side registers.
   Air Mix Control Damper	MAX COLD to MAX HOT Temperature Setting	D, E	Varies the mixture of cold air and hot air in order to regulate the temperature continuously from hot to cold.

Air Outlets and Airflow Volume

1. for Front Registers
   

   
   
   
   
   

   Indication (Mode)	Front Center Register	Side Register	Front Footwell Register	Rear Face Register	Rear Footwell Register	Front Defroster
   	A	B	C	D	E	F
   Face			-		-	-
   Bi-level						-
   Foot
   Foot/Def
   Def	-	-	-	-	-

   HINT:

   1. The size of the circle indicates the proportion of airflow volume.
      
   2. The same system is used for LHD and RHD vehicles.
      




2. for Rear Registers (w/ Rear Air Conditioning System)
   

   
   
   
   
   

   Indication (Mode)	Rear Roof Register	Rear Side Register
   	A	B
   Face		-
   Bi-level
   Foot	-

   HINT:

   The size of the circle ○ indicates the ratio of airflow volume.

A BUS connector is used in the wire harness that connects the servo motor to the air conditioning amplifier assembly.

Each BUS connector has a built-in communication/driver IC which communicates with each servo motor connector, actuates the servo motor, and has a position detection function.

The pulse pattern type servo motor detects the relative position using 2-bit on/off signals.
The forward and reverse revolutions of this motor are detected using two signals, A and B, which output four types of patterns. The air conditioning amplifier assembly counts the number of pulse patterns in order to determine the stopped position.

General

1. The PTC heater is located above the heater core in the air conditioner unit.
   





2. The PTC heater consists of a PTC element, aluminum fins and brass plates. When current is applied to the PTC element, it generates heat to warm the air that passes through the unit.
   

   
   
   
   

PTC Heater Operating Conditions

1. The on/off operation of the PTC heater is controlled by the air conditioning amplifier assembly in accordance with the engine coolant temperature, ambient temperature, engine speed, air mix setting and electrical load (generator power ratio).
   For example, the number of operating PTC heaters varies according to engine coolant temperature as shown in the graph below.
   

   
   
   
   

The viscous with magnet clutch heater assembly, which is located on top of the engine, is driven by a drive belt. Pressing the heater switch assembly provided in the instrument panel engages the magnetic clutch, causing the rotor in the viscous with magnet clutch heater assembly to rotate and the silicon oil to mix. The shear heat that is thus generated heats the coolant.

The viscous with magnet clutch heater assembly is controlled in accordance with the engine speed, coolant temperature and ambient temperature. While the power heater is engaged, the engine idling speed is raised to a predetermined value whenever the shift lever is in N or D.