Circuit Description
WARNING: This page is about a different car, the 2007 Saturn Vue. However, it is still accessible from the selected car via links, so may be relevant.
The powertrain control module (PCM) monitors the stop lamp switch signal circuit and the cruise control release signal circuit every 100 ms. The PCM monitors the status of the stop lamp switch signal circuit and the cruise control signal circuit to see if they match when the brake pedal is pressed or released.