Vision V6-215 3.5L SOHC (1995)
Body Controller: Description and Operation
Airbag System
Vehicles equipped with the Chrysler airbag system can be identified by the presence of an extra-large horn pad in the center of the steering wheel
and a pad above the glove box on the instrument panel, both bearing the SRS airbag logo.
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.
For 1994-1/2 - 1997 LH body vehicles: A new hybrid passenger side airbag assembly was introduced. This bag assembly utilizes a canister of
compressed, inert gas to inflate the bag, instead of sodium azide. The pressure of the canister is monitored by a non-serviceable pressure switch,
which is built into the canister. The pressure switch is wired to and monitored by the Airbag Control Module (ACM).
The Airbag Control Module (ACM) changed part numbers at mid-year, when the hybrid passenger airbag was introduced; it is not interchangeable
with the previous part number. This is because of the addition of the hybrid bag pressure switch input.
The ASDM system is a mechanically-triggered system utilizing two front impact sensors and a sensor inside the airbag control module to trigger
the airbags.
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 goes ON 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 controlled 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 4Oms.
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 to find the cause of any customer complaint regarding the AIRBAG warning lamp, such as:
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Warning lamp does not come on at all
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Warning lamp stays on
Body Control Module
The Body Control Module (BCM) supplies vehicle occupants with visual and audible information and controls various vehicle functions. To
provide and receive information, the module is interfaced to the vehicle's serial bus communications network (the Chrysler Collision Detection
bus, or CCD bus). This network consists of the Powertrain Control Module (PCM), the Transmission Control Module (TCM), the
electro/Mechanical Instrument Cluster (MIC), the optional Overhead Travel Information System (OTIS), Airbag Control Module (ACM), and the
optional Automatic Temperature Control (ATC) display head. The BCM is operational when battery power is supplied to the module. Ignition
switch power is needed for ignition switched functions.
The body control module provides the following features:
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A/C switch status I evaporator temperature status
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automatic door locks (not available in 1993 BCM)
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automatic headlamps (ultra light system)
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automatic temperature control support
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chimes
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courtesy lamps
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BCM diagnostic support
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door ajar lamp
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door lock inhibit
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headlamp time delay
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Ignition key lamp
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illuminated entry with "fade to off"
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instrument panel dimming
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low washer fluid lamp
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mechanical instrument cluster support
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overhead travel information system (OTIS) support
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power door locks (with/without remote keyless entry)
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vehicle theft security system (VTSS) (not available on 1993 vehicles)
