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Home >> Chevrolet >> 2020 >> Express 2500 LS, 6.0L Eng VIN G >> Repair and Diagnosis >> External Pages >> Different car >> Section 17 (Seat Belts) >> Diagnostic Information and Procedures >> Seat Belt Indicator Malfunction - Driver >> Circuit/System Description

Circuit/System Description

WARNING: This page is about a different car, the 2019 GMC Savana 3500, 2019 GMC Savana 2500, 2019 Chevrolet Express 3500, and 2019 Chevrolet Express 2500. However, it is still accessible from the selected car via links, so may be relevant.

The seat belt buckle switch is located within the seat belt buckle assembly and provides an input to the inflatable restraint sensing and diagnostic module (SDM). The SDM supplies a low reference circuit and a seat belt switch signal circuit to determine a buckled or unbuckled condition.

If the SDM determines the driver seat belt has not been buckled, the SDM will send a serial data message to the instrument panel clutch (IPC) to illuminate the seat belt warning indicator. If the SDM determines that a driver is sitting in the driver seat and the seat belt has not been buckled, the SDM will send a serial data message to the passenger presence system (PPS) display to illuminate the driver seat belt warning indicator.

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