Air Conditioning (Manual A/C)
SYSTEM OUTLINECurrent always flows from the HTR fuse to TERMINAL 1 of the HTR relay. When the ignition SW is turned on, the current from the HEATER fuse flows to TERMINAL 6 of the air vent mode control servo motor, to TERMINAL (B) 5 of the heater control SW, to TERMINAL 7 of the air inlet control servo motor to the MG CLT relay (Coil side) to TERMINAL MGC of the A/C amplifier (1MZ-FE) or TERMINAL ACMG of the engine control module (5S-FE), to TERMINAL 1 of the A/C dual pressure SW to TERMINAL 4 to TERMINAL +B of the A/C amplifier (1MZ- FE) or TERMINAL PRS of the engine control module (5S-FE), current also to the HTR relay (Coil side) to TERMINAL 3 of the blower SW.
1. HEATER SLOWER MOTOR OPERATION
* Low speed operation
When the blower SW is moved to LO position, current flows to TERMINAL 3 of the blower SW to TERMINAL 1 to GROUND, activating the HTR relay. This causes the current to flow from the HTR fuse to TERMINAL 1 of the HTR relay to TERMINAL 2 to TERMINAL 2 of the blower motor to TERMINAL 1 to TERMINAL 2 of the blower resistor to TERMINAL 3 to GROUND, causing the blower motor to rotate at low speed.
* Medium speed operation (Operation at M1, M2)
When the blower SW is moved to M1 position, current flows to TERMINAL 3 of the blower SW to TERMINAL 1 to GROUND, turning the HTR relay to switch on. This causes the current to flow from the HTR fuse to TERMINAL 1 of the HTR relay to TERMINAL 2 to TERMINAL 2 of the blower motor to TERMINAL 1 to TERMINAL 2 of the blower resistor to TERMINAL 1 to TERMINAL 4 of the blower SW to TERMINAL 1 to GROUND. At this time, the blower resistance of the blower resistor is less than at low speed, so the blower motor rotates at medium low speed.
When the blower SW is moved to M2 position, current flows through the motor flows from TERMINAL 2 of the blower resistor to TERMINAL 6 to TERMINAL 8 of the blower SW to TERMINAL 1 to GROUND. At this time, resistance of the blower resistor is less than at M1 position, so the blower motor rotates at medium high speed.
* High speed operation
When the blower SW is moved to HIGH position, current flows to TERMINAL 3 of the blower SW to TERMINAL 1 to GROUND, turning the HTR relay to switch on.
This causes the current to flow from the HTR fuse to TERMINAL 1 of the HTR relay to TERMINAL 2 to TERMINAL of the blower motor to TERMINAL 1 to TERMINAL 5 of the blower SW to TERMINAL 1 to GROUND, causing the blower motor to rotate at high speed.
2. AIR INLET CONTROL SERVO MOTOR OPERATION
* Switching from FRESH to RECIRC
With the ignition SW turned on, current flows from the HEATER fuse to TERMINAL 7 of the air inlet control servo motor. When the RECIRC-FRESH SW is switched to the RECIRC side, current flows from TERMINAL 7 of the air inlet control servo motor to TERMINAL 1 to TERMINAL (B) 9 of the heater control SW to TERMINAL (B) 7 to GROUND. The motor rotates and the damper moves to the RECIRC side. When it is in the RECIRC position, current is cut inside the servo motor and the damper stops at that position.
* Switching from RECIRC to FRESH
With the ignition SW turned on, when the RECIRC/FRESH SW is switched to the FRESH side, current flows from TERMINAL 7 of the air inlet control servo motor to TERMINAL 3 to TERMINAL (B) 10 of the heater control SW to TERMINAL (B) 7 to GROUND, the motor rotates and the damper moves to the FRESH side. When it is in the FRESH position, current is cut inside the servo motor and the damper stops at that position.
3. AIR VENT MODE CONTROL SERVO MOTOR OPERATION
When the damper is in FACE position and B/L mode on the heater control SW is selected, current flows from TERMINAL A) 7 of the heater control SW to TERMINAL 2 of the air vent mode control serve motor so that a signal that the ground circuit is activated is input into TERMINAL B of the control circuit inside the air vent mode control servo motor. Simultaneously, a signal that the ground circuit is not activated is input into TERMINAL A of the control circuit inside the servo motor. These two signals activate the control circuit so that current flows from the HEATER fuse to the servo motor, causing the servo motor to operate and the damper to move to B/L position. When the damper reaches B/L position. A ground cut signal is input into TERMINAL B of the control circuit, the control circuit operates, the servo motor stops rotating and the damper stops at B/L When another mode position is selected, input of signals into TERMINAL A and TERMINAL B of the control circuit that ground is made or not (As explained above) activates the control circuit and moves the servo motor to the desired position.
4. AIR CONDITIONING OPERATION
When the blower SW is on, current flows from the HEATER fuse to the HTR relay (Coil side) to TERMINAL 3 of the blower SW to TERMINAL 1 to GROUND, activating the HTR relay. This causes current to flow from the HTR fuse to the HTR relay (Point side) to A/C fuse to TERMINAL 2 of the A/C SW. If the A/C SW is turned on at this time, a signal is input into the A/C amplifier (1MZ-FE) or engine control module (5S-FE) This activates the A/C amplifier (1MZ-FE) or engine control module (5S-FE) and MG CLT relay so that current flows from the HEATER fuse to the MG CLT relay (Point side) to A/C magnetic clutch. Causing The compressor to operate.
5. DEF OR F/D SYNCHRONIZED CONTROL FUNCTION
When the blower SW is on and the heater control SW is at DEF position, it causes A/C to run whether A/C SW is on or not.
When the blower SW is on and the heater control SW is at DEF or F/D position, the RECIRC/FRESH SW is switched to the FRESH side, it causes FRESH position to turn whether RECIRC/FRESH SW is turned on to FRESH position or not.