Air Distribution: Notes
WARNING: This page is about a different car, the 2002 Oldsmobile Intrigue. However, it is still accessible from the selected car via links, so may be relevant.
When the mode switch is pressed, a signal is sent from the HVAC control module to the vacuum control assembly. The HVAC control module will provide ground for the necessary mode actuator solenoid, connecting the desired mode actuator to vacuum. The instrument panel fuse block provides power to the vacuum control assembly through the ignition 3 voltage circuit. Ground is provided by the HVAC control module.