Circuit/System Description

WARNING: This page is about a different car, the 2022 Cadillac CT4. However, it is still accessible from the selected car via links, so may be relevant.

For an overview of the component/system, refer to: Supplemental Inflatable Restraint System Description and Operation

The F112D Seat Belt Retractor - Driver and F112P Seat Belt Retractor - Passenger are pyrotechnic units that contain an ignitor, which, when supplied with voltage, ignites the propellant in the gas generator. The F112 Seat Belt Retractors are respectively located on the driver and passenger center pillars. The deployment loop has a high control circuit that will supply voltage to deploy the pretensioner and a low control that will supply ground to deploy the pretensioner. The F112D Seat Belt Retractor - Driver uses circuit 3477 as high control and circuit 3478 as low control. The F112P Seat Belt Retractor - Passenger uses circuit 3475 as high control and circuit 3476 as low control. Based on inputs from the impact sensors, the K36 Restraints Control Module will command deployment of the F112 Seat Belt Retractors by simultaneously applying voltage to the high control circuit, and ground to the low control circuit