Front Heater

CIRCUIT OPERATION
In the RUN position, the ignition switch connects circuit A2 from fuse 3 in the Power Distribution Center (PDC) with circuit A22. Circuit A22 feeds a bus bar in the fuse block. The bus bar powers circuit C1 through fuse 7. Circuit C1 supplies battery voltage to the blower motor switch. If the vehicle is equipped with a rear heater, circuit C1 also splices to the rear heater relay

In the LOW position the blower motor switch connects circuit C1 and circuit C6. Circuit C6 powers circuit C17 through three resistors in the blower motor resistor block. From circuit C17, current passes through the closed contacts in the blower motor relay to the blower motor on circuit C7. Circuit Z1 provides ground for the blower motor.

In the MEDIUM position the blower motor switch connects circuit C1 and circuit C4. Circuit C4 powers circuit C17 through the first resistor in the blower motor resistor block. From circuit C17, current passes through the closed contacts in the blower motor relay to the blower motor on circuit C7.

When the blower motor switch is in the HIGH position, circuit C1 powers circuit C9. Circuit C9 provides power to the coil side of the blower motor relay Circuit Z1 provides ground for the relay coil. When circuit C9 powers the relay coil, the relay energizes and switches to connect circuit A2 from fuse 3 in the PDC to circuit C7. Circuit C7 powers the blower motor.