Circuit/System Description
WARNING: This page is about a different car, the 2008 Cadillac CTS. However, it is still accessible from the selected car via links, so may be relevant.
The body control module (BCM) monitors the cruise control indicator switch. When the cruise on/off switch is switched ON, the cruise control switch is closed and the cruise indicator signal circuit is high. When the cruise on/off switch is pressed OFF, the cruise control switch is open and the cruise indicator signal circuit is low.