The On-Board Diagnostic System

THE ON-BOARD DIAGNOSTIC SYSTEM

The air bag system is monitored by the SRS diagnostic module (SDM). The SRS diagnostic module contains the safing sensor, an integral sensor in the circuitry of the system that is used to fire the air bag module.

The SRS diagnostic module monitors critical input and output circuits within the air bag system, making sure they are operating correctly. Some circuits are tested continuously; others are checked only under certain circumstances. The SRS diagnostic module provides information about the air bag system through the SRS warning light and the DRBII.

Each circuit monitored by the SRS diagnostic module has a corresponding code assigned to it. Refer to "System Codes" found later in this section for a list and definition of the air bag system codes.

� If a malfunction is detected, the SRS light remains lit until service is performed, and a code is stored in the SRS diagnostic module. SRS diagnostic module's memory along with the length of time the SRS light is on. The maximum time stored is 9999 minutes (167 hours).