Circuit/System Description

WARNING: This page is about a different car, the 2007 Cadillac DTS. However, it is still accessible from the selected car via links, so may be relevant.

The passenger seat belt buckle sensor is a two wire sensor wired to the inflatable restraint sensing and diagnostic module (SDM) using a signal circuit and a low reference circuit. When the passenger presence system (PPS) indicates that the seat is occupied, the SDM determines and sends the status of the passenger seat belt via serial data to the instrument panel cluster (IPC). After receiving the message, the IPC controls the illumination of the passenger seat belt indicator by grounding the indicator control circuit. If an occupant is seated in the front passenger seat and the seat belt is unfastened, the SDM will send a message to the IPC to illuminate the fasten seat belt indicator for approximately 72 seconds or until the seat belt is fastened.