The blower motor circuit contains the following components:
| • | The blower resistor assembly |
| - | The A/C and rear defogger control assembly |
Battery voltage applies to the mode selector when the ignition switch
is in RUN. The mode selector energizes the blower motor relay when you make
any selection except OFF. The blower motor relay sends battery voltage
to the blower motor. The blower motor ground controls the speed of the
blower motor. When the blower switch is set to 1, the blower resistor
limits the voltage to the blower motor. The resistor slows the motor
down. When the blower switch is set to 2 or 3, the resistance
decreases in order to allow more voltage to the blower motor. When the
blower switch is set to 4 the following events occur:
| • | The blower switch bypasses the blower resistor. |
| • | The blower switch allows full battery voltage at the blower motor. |
Then, the blower runs at high speed.
