Circuit/System Description
WARNING: This page is about a different car, the 2010 Pontiac G5 and 2010 Chevrolet Cobalt. However, it is still accessible from the selected car via links, so may be relevant.
The HVAC control assembly applies a ground to the blower motor control circuit that corresponds to the selected blower speed. The resistors and the blower motor are in a series circuit. The following list represents the number of resistors in series with the blower motor per particular speed request:
- Low speed, 3 resistors
- Medium 1 speed, 2 resistors
- Medium 2 speed, 1 resistor
When the operator requests high speed, the HVAC control module applies ground directly to the blower motor.
When the OFF position is selected, the HVAC control module applies ground to the off input within the HVAC control module through the off blower motor control circuit. When the HVAC control module receives this input, any air conditioning (A/C) requests will be cancelled and the A/C request LED will not be illuminated.