Grand Voyager V6-201 3.3L VIN R SMFI (1997)
Body Control Module: Description and Operation
Airbag System
SYSTEM DESCRIPTION
The airbag system is designed to provide increased driver and passenger protection if the vehicle is involved in a front-end collision. The system is
most effective when used in conjunction with the seat belt system.
The passenger side airbag assembly utilizes a canister of compressed, inert gas to inflate the bag, instead of sodium azide.
The airbag control module AECM is an electronically-triggered system that uses only its own internal electronic sensor to trigger the airbags. The
term "airbag control module" (or ACM) will be used to refer to the module.
FUNCTIONAL OPERATION
Whenever the ignition key is turned to the "run" or "start" position, the airbag control module (ACM) performs a lamp check by turning the
AIRBAG warning lamp on. The lamp stays lit for 6 to 8 seconds, then goes off. If the lamp remains off, it means that the ACM has checked the
system and found it to be free of discernible malfunctions. The airbag system is monitored by the ACM.
The ACM monitors critical input and output circuits within the airbag system, making sure they are operating correctly. Some circuits are tested
continuously; others are checked only under certain circumstances. The ACM provides diagnostic information about the airbag system to the
technician through the DRB via the CCD bus.
The deceleration or g-force resulting from the impact of a front-end collision causes the electronic sensor inside of the ACM to be triggered. This
causes the inflators to be actuated, thus deploying the airbags. The total time between determining to deploy and full inflation of the airbag is
approximately 40ms.
For 1997 a new enhanced accident response feature has been added. This feature, upon deployment of the airbag, turns on the interior lights and
unlocks the power door locks (if equipped).
The AIRBAG warning lamp is the only point at which "symptoms" of a system malfunction can be observed by the customer.
Use the test procedures in this book to find the cause of any customer complaint regarding the AIRBAG warning lamp, such as:
-
warning lamp does not come on at all
