Front Heater

In the RUN position, the ignition switch connects circuit A2 from fuse 2 in the Power Distribution Center (PDC) to circuit A22. Circuit A22 powers a bus bar in the fuse block that supplies voltage circuit C1 through fuse 7.

Circuit C1 supplies battery voltage to the front blower motor switch. The switch sets blower motor speed to HIGH, MEDIUM, LOW or OFF.

The switch connects to the blower motor resistor block. The resistor block contains two resistors connected in series. Circuit C7 connects the resistor block to the blower motor.

When the blower motor switch is in the LOW position, it supplies voltage to the resistor block on circuit C4. From circuit C4, voltage passes through both resistors in the resistor block to circuit C7.

In the MEDIUM position, the blower motor supplies voltage to the resistor block on circuit C5. From circuit C5 voltage flows through one resistor to circuit C7.

In the HIGH position, the blower motor switch connects directly to circuit C7. Voltage does not pass through the resistor block.

Circuit Z9 provides ground for the blower motor. The Z9 circuit terminates on the right side of the dash panel in the engine compartment.