Resistor Module
WARNING: This page is about a different car, the 1992 Oldsmobile Custom Cruiser, 1992 Chevrolet Caprice, and 1992 Buick Roadmaster. However, it is still accessible from the selected car via links, so may be relevant.
The resistor module is located in SIR harness between inflator module and Diagnostic Energy Reserve Module (DERM). The resistor module allows the DERM to monitor the deployment loop for faults and to detect whether a deployment has occurred.
The resistors in the resistor module are balanced with the resistors on the arming and discriminating sensors to allow the DERM to monitor the voltage drops across the components of the deployment loop. Faults are detected during normal non-deployment conditions by monitoring these voltages. On some vehicles, the resistor module is mounted on the DERM.