Circuit/System Description
WARNING: This page is about a different car, the 2007 Pontiac G5 Pursuit, 2007 Pontiac G5, and 2007 Chevrolet Cobalt. However, it is still accessible from the selected car via links, so may be relevant.
The inflatable restraint sensing and diagnostic module (SDM) sends the status of the passenger seat belt switch to the Passenger Air Bag ON/OFF indicator via a serial data communication message. The body control module (BCM) controls the passenger seat belt indicator by using the serial data communication message from the SDM. If the seat belt is unfastened, only if an occupant is seated in the front passenger seat, the SDM will send a message to the BCM to illuminate the fasten safety belt indicator for 72 seconds or until the seat belt is fastened.