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HVAC
19
HVAC
ii) BLOWER CONTROL MODULE
The PWM Controller controls the speed of the blower
motor using PWM signal. Based on the speed se-
lected by the user, a low current, inverted PWM
signal is produced in the Control Panel. This signal is
then amplified by the PWM Controller which in turn
drives the motor.
PIN OUT
CONNECTION DETAILS
PIN OUT DESCRIPTION
1
PWM Signal
2
Blower Ground (Switched Ground)
3
Battery Ground
4
Ignition
INSPECTION
Check for the Output voltage values of Blower motor
as per the table given below;
FAN
SPEED
CORRESPONDING O/P VOLTAGE
VALUES at BLOWER MOTOR
TERMINALS
1
st
5.5 V
2
nd
7.5 V
3
rd
9 V
4
th
12.5 V