Air Speed - Auxiliary - VIN 3: Notes

WARNING: This page is about a different car, the 2002 Oldsmobile Bravada, 2002 GMC Envoy XL, 2002 GMC Envoy, and 2002 Chevrolet TrailBlazer. However, it is still accessible from the selected car via links, so may be relevant.

The auxiliary HVAC system uses an LED display for air speed. When one LED is illuminated on the auxiliary HVAC control module the air flow through the center console to the rear is provided by the primary blower motor. The air speed will vary depending on the front blower motor setting. When 2 LED's are illuminated the auxiliary blower motor is set to medium speed. When 3 LED's are illuminated the auxiliary blower motor is set to high speed. When the operator selects medium blower speed, power is delivered to the auxiliary blower motor through the auxiliary blower motor medium speed control circuit. When the operator selects high blower speed, power is delivered to the auxiliary blower motor through the auxiliary blower motor high speed control circuit. Ground is provided to the blower motor through the ground circuit. Power and ground are provided to the auxiliary HVAC control module through the ignition 3 voltage and ground circuits.