19-4
LIGHTS/SWITCH/HORN
THERMOSTATIC SWITCH
● Remove the front covers.
● Start and run engine to make the water temperature
reaches 85°C~90°C and check if the cooling fan motor
operates.
● Lower the water temperature to 85°C and check if the
fan motor stops.
HEATER CONTROLLER UNIT
● Open ignition switch to check if the brown blue wire of
it is enough voltage.
● Put the heater controller unit in refrigerator.
● Start engine after keeping the temperature under
0°C.
● Check if the yellow wire of heater controller unit has
output voltage. Start engine and if the temperature of
heater controller unit is under 0°C
● Check if the white/yellow wire of heater controller unit
has output voltage.
● If it has not any voltage, it is damaged.
● If the fan motor does not start, disconnect the wires
from the thermostatic switch and then connect a jumper
wire between the wire harness and thermosensor wires
(black and green wires).
● Turn the ignition switch ON.
● The thermostatic switch is faulty if the cooling fan
motor runs properly.
● If it does not start, check for voltage between the fan
motor coupler wire terminals (black~green).
● If there is no voltage, check for the following:
● Blown or faulty fuse.
● Loose terminals or connectors.
● Shorted wire in the wire harness.
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