The On-Board Diagnostic System

THE ON-BOARD DIAGNOSTIC SYSTEM

The air bag system is monitored by the Air Bag System Diagnostic Module (ASDM). The ASDM contains the safing sensor, an integral sensor in the circuitry of the system that is used to fire the air bag module.

The ASDM 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 ASDM provides information about the air bag system through the AIR BAG warning light and the DRBII.

Each circuit monitored by the ASDM 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 AIR BAG light remains lit until service is performed, and an active code is stored in the ASDM's memory after the ignition has been cycled.


� If the code is intermittent, the AIR BAG light illuminates for 12 seconds. The code is stored, along with the time in minutes that it was active, and the number of times the ignition has been cycled. The minimum time stored for any code is one minute.