CIRCUIT DIAGRAM
See AIR CONDITIONING under WIRING DIAGRAMS in ELECTRICAL section.
Scheme 39
Scheme 40
POWER SUPPLY CHECK
In turning off IGN, battery supplies power for ordinary power, FATC connector A-3 through battery fuse. FATC performs memory function by means of battery power supplied as described above. In turning on IGN, alternator is driven. At this time, IG2 power generated in alternator FATC connector A-12 and A-25 terminal through IG1 fuse and air conditioner fuse (10A). FAT carried out actual system operation by means of IG2 power supplied as described above.
Scheme 41
Scheme 42
BACK LIGHT AND REAR GLASS HEAT RAYS CHECK
In turning on IG and then light switch, battery power is supplied for FATC connector A-2 terminal through wiring. The supplied power passes connector A-1 terminal through light bulb in FATC and flows into rheostat as shown in the above figure. The brightness is adjusted according to resistance value of rheostat.
Scheme 43
Scheme 44
BLOWER CHECK
Perform the blower check in manual blower running state because it is difficult to check blower at automatic control. Blower is controlled from level I to level 7 equally as in button operation and running logic. In turning on IG, blower relay is ON and voltage of 0.1 to 1.4V is transferred from FATC connector A-4 terminal to base source of power TR according to FATC control (selectable from level 1 to level 7). At this time, voltage of blower motor's both ends is determined according to collector voltage of FATC connector A-5 terminal. If FATC is controlled in level 7, GND(0V) is supplied for FATC connectorA-18 terminal and high blower relay is driven.
Scheme 45
Scheme 46
AIR CONDITIONER CHECK
11V is outputted from connector A-17 terminal in turning on INSULATING and pressing air conditioner switch. However, although 11V is outputted from FATC connector A-17 terminal, compressor clutch isn't driven. Wind of air conditioner is discharged if only compressor clutch works. Output signal from air conditioner is inputted in engine computer through triple switch. Then, the engine computer considers several conditions and when output of air conditioners judged to be practical, it gives GND to signal terminal of air conditioner relay. Accordingly, relay of air conditioner is ON and compressor clutch works. Triple switch checks pressure of refrigerant flowing through pipe and turns on/off switches in it according to standard. So, it controls that output signal of air conditioner outputted from FATC is inputted into engine computer, and also speed of condenser fan according to pressure level. (For high pressure, high-speed and for low pressure, low-speed.
Scheme 47
Scheme 48
INTAKE AND AQS CHECK
In turning on IG and selecting outdoor mode with indoor switch, 12V is outputted from FATC connector A-23 terminal, 0V is supplied for A-10 terminal and motor works in direction of outdoor. In selecting indoor mode with indoor-switch, 12V is outputted from FATC connector A-10 terminal, 0V is supplied for A-23 terminal and motor works in direction of indoor.
Scheme 49
Scheme 50
MODE CHECK
In turning on IG and selecting mode switch, sequential operation begins in order of Vent, Bi-level, Blower, Mix. DIP mode works regardless of order at selecting it. In selecting Vent mode as mode switch, GND(0V) is supplied for FATC connector A-14(Vent) terminal. Voltage of 9V and more is set in the rest terminal A-15(DEF) and motor drive IG in mode actuator which receives the signal, works in direction of vent mode setup. Vent, Built-in-level, Blower, Mix and Defrost mode can be selected in the method described above.
Scheme 51
Scheme 52
TEMP CHECK
In adjusting temp switch from 32°C to 17°C, 11V is outputted from FATC connector A-9 terminal, 0V is supplied for A-22 terminal and temp motor works in direction of COOL. In adjusting temp switch from 17°C to 32°C, 11V is outputted from FATC connector A-22 terminal, 0V is supplied for A-9 terminal and temp motor works in direction of WARM. When temp actuator has to move to a certain location for its automatic control, temp feedback signal terminal moves equally in temp actuator and informs controller of location of temp actuator through FATC connector B-10 terminal. Comparing original value with inputted value, it works until they are same. If 4.9V and more is inputted in B-10 terminal, it is regarded as disconnection. If 0.1V and less is inputted in B-10 terminal, it is regarded as short-circuit. In the case of disconnection or short-circuit as a result of self-diagnostic, substitute control is carried out as follows.
- If setup temperature is 17°C to 24.5°C, set to MAX COOL.
- If setup temperature is 25°C to 32.0°C, set to MAX WARM.
