HVAC Control

CIRCUIT OPERATION
Battery Voltage for the HVAC control is supplied on circuit V23. This circuit is HOT in the START/ RUN position and connects from the ignition switch to the HVAC control.

Circuit A1 supplies Voltage to the ignition switch. This circuit is protected by a 40 amp fuse located in cavity 5 of the Power Distribution Center (PDC).

Ground for the HVAC control is supplied on circuit Z1 and Z2. The Z2 circuit terminates at the instrument panel ground, and the Z1 circuit terminates at the blower motor ground.

The Z2 circuit is spliced internal to the HVAC control and supplies the ground path for the other switches and indicators in the switch pod, in addition the Z2 circuit supplies ground for the temperature control(s), and mode select switch.

The HVAC control uses resistors in the temperature control(s) and the mode switch to determine operators request.