High Blower Speed
WARNING: This page is about a different car, the 2002 Pontiac Grand Prix. However, it is still accessible from the selected car via links, so may be relevant.
When the High blower speed is selected, the HVAC control assembly applies voltage to the blower motor relay through the high blower motor control circuit. The blower motor relay is internal to the blower motor resistor assembly. The voltage energizes the blower motor relay, causing the blower motor to be connected to the battery positive voltage circuit. The blower motor is grounded through the blower motor resistor assembly and ground circuit of the blower motor resistor assembly.