Paseo Coupe L4-1497cc 1.5L DOHC MFI (1997)
Radiator Cooling Fan Motor: Description and Operation
1. HEATER BLOWER MOTOR OPERATION
Current is applied at all times through the HEATER fuse to TERMINAL 5 of heater Relay.
When the ignition SW is turned ON, current flows through gauge fuse to TERMINAL 3 of the heater Relay --> coil --> TERMINAL 1 -->
TERMINAL 5 of the Blower SW.
* Low Speed Operation
When the blower SW is moved to LO position, the current flows to TERMINAL 1 of blower SW --> TERMINAL 8 --> GROUND, causing
the Heater Relay to ON. This causes the current flowing from the HEATER fuse --> TERMINAL 5 of the Heater Relay --> TERMINAL 4
--> TERMINAL 1 of the blower motor --> TERMINAL 2 --> TERMINAL 1 of the Blower Resistor --> TERMINAL 4 --> GROUND,
causing the blower motor to rotate at low speed.
* Medium Speed Operation (Operation at M 1, M 2)
When the blower SW is moved to M1 position, the current flows to TERMINAL 1 of blower SW --> TERMINAL 8 --> GROUND, and
turned the Heater Relay ON. This causes the current flowing from the Heater fuse --> TERMINAL 5 of the heater Relay --> TERMINAL 4
--> TERMINAL 1 the blower motor --> TERMINAL 2 --> TERMINAL 1 of the blower resistor --> TERMINAL 2 --> TERMINAL 3 of
the blower SW --> TERMINAL 8 --> GROUND. 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 flowing through the motor flows from TERMINAL 1 of the Blower Resistor -->
TERMINAL 3 --> TERMINAL 2 of the blower SW --> TERMINAL 8 --> GROUND. 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 HI position, the current flows to TERMINAL 1 of blower SW --> TERMINAL 8 --> GROUND and turns
the Heater Relay ON.
This causes the current flowing from the Heater fuse to TERMINAL 5 of the Heater Relay --> TERMINAL 4 --> TERMINAL 1 of blower
motor --> TERMINAL 2 --> TERMINAL 6 of the blower SW --> TERMINAL 8 --> GROUND, causing the blower motor to rotate at high
speed.
2. RADIATOR FAN AND CONDENSER FAN OPERATION
When the ignition SW is turned ON, the current flows from the ECU-IG fuse to TERMINAL 2 of the Fan Relay --> TERMINAL 1 -->
TERMINAL 3 of the A/C single pressure SW --> TERMINAL 2 --> TERMINAL 1 of the water temp. SW (Radiator Fan) --> GROUND,
activating the Fan Relay. At this time, current is supplied from RAD FAN fuse to TERMINAL 4 of the Fan Relay. At the same time, current from
the ECU-IG fuse through TERMINAL 1 of the A.C Fan no. 2 Relay --> Coil --> TERMINAL 2 --> A/C Single Pressure SW --> Water Temp.
SW (Radiator Fan) --> GROUND, then through the CDS FAN fuse --> TERMINAL 2 of the A/C Condenser Fan Motor --> TERMINAL 1 -->
TERMINAL 3 of the A.C Fan no. 2 Relay -->TERMINAL 5 --> TERMINAL 3 of the A.C Fan no. 3 Relay.
* Low Speed Operation
When the A/C magnetic clutch is turned ON during A/C operation, current from the A/C fuse flows through TERMINAL 2 of the A/C
Magnetic Clutch Relay --> TERMINAL 4 --> TERMINAL 1 of the A.C Fan no.3 Relay --> TERMINAL 2 --> GROUND, activating A.C
Fan no.3 Relay. Then the current applied to TERMINAL 3 of the A.C Fan no.3 Relay flows through TERMINAL 5 --> TERMINAL 2 of
the Radiator Fan motor --> TERMINAL 1 --> GROUND. Since the Condenser and Radiator Fan motor are connected in series, both Fans
rotate at low speed.
* High Speed Operation
During A/C operation when the water temp. reaches approx. 90° C (194° F) or more (water temp. SW (Radiator Fan) is OFF) or the
refrigerant pressure reaches 1520 kPa (15.5 kgF/cm2, 220 psi) or more (A/C single pressure SW is OFF), current to the Fan Relay and A.C
Fan no.2 Relay is OFF and that to the motor is supplied in parallel, causing the motor to rotate at high speed.
3. AIR CONDITIONING OPERATION
When the blower SW is set ON, current from the A/C fuse flows through TERMINAL 1 of the A/C dual pressure SW --> TERMINAL 4 -->
TERMINAL 2 of the A/C Amplifier. The Engine RPM signal from the Ignitor, the evaporator temp. signal from the A/C Thermistor and the lock
signal from the Lock Sensor are all supplied to the A/C Amplifier.
When the A/C SW is turned ON, the A/C SW ON signal is sent to the A/C amplifier. Current flows from the A/C fuse --> TERMINAL 1 of the
A/C magnetic clutch Relay --> Coil --> TERMINAL 3 --> TERMINAL 11 of the A/C amplifier --> TERMINAL 5 --> GROUND, turning the
A/C magnetic clutch Relay ON.
This causes current from A/C fuse to flow to the A/C Magnetic Clutch, turning the A/C Magnetic Clutch ON.
When any of the following signals are input to the A/C amplifier, the amplifier operates to turn OFF the air conditioning.
* Engine low RPM signal.
* A signal that the temperature at evaporate is low.
* A signal that the refrigerant pressure is abnormally high or low.
* A signal that the A/C Compressor is locked.
