Rear Heater

CIRCUIT OPERATION
In the RUN position, the ignition switch connects circuit A2 from fuse 3 in the Power Distribution Center (PDC) to circuit A22. Circuit A22 powers circuit C1 through fuse 7 in the fuse block.

Circuit C1 supplies battery voltage to the front blower motor switch and splices to the coil side of the rear heater relay Circuit Z1 provides ground for the coil side of the relay When circuit C1 powers the relay coil, the rear heater relay contacts close and connect circuit F36 from fuse 14 in the fuse block to circuit D30. Circuit D30 connects to the rear blower motor switch.

When the rear blower motor switch is in the LOW position, it supplies voltage to the resistor block on circuit C50. From circuit C50, voltage passes through both resistors in the resistor block to the blower motor.

In the MEDIUM position, the rear blower motor switch supplies voltage to the resistor block on circuit C60. From circuit C60 voltage flows through one resistor to the blower motor.

In the HIGH position, the blower motor switch connects directly to the blower motor on circuit C70. Voltage does not pass through the resistor block.