A/C Switch
WARNING: This page is about a different car, the 1995 Toyota Land Cruiser. However, it is still accessible from the selected car via links, so may be relevant.
When A/C is turned on, input signal is delivered to Engine Control Module (ECM). The ECM uses input signal to control engine idle speed during A/C operation.
NOTE:
Airflow meter may be referred to as Volume Airflow (VAF) meter or Mass Airflow (MAF) meter.