With the Ignition Switch in RUN, battery voltage is applied to the HVAC Control Selector Switch. The HVAC Control Selector Switch applies power to the Selector Switch in all modes but OFF. With the Blower Switch set to LO, battery voltage is applied to the Blower Motor through the Blower Resistor and the normally closed contacts of the Blower Motor Relay. The Blower Motor runs at low speed. When the Blower Switch is in the M1 or M2 position, the operation is similar to the operation in LO except the resistance through the Blower Resistor is decreased, causing the Blower Motor to run faster in M1 and even faster in M2. When HI blower speed is selected, the Blower Switch applies voltage to the High Blower Relay coil. The Blower Motor Relay is energized, applying voltage from CKT 1202 through the relay directly to the Blower Motor. The Blower Motor then runs at high speed.