Air Bag Control Module: Description and Operation
OCCUPANT RESTRAINT CONTROLLERThe Occupant Restraint Controller (ORC) is also sometimes referred to as the Airbag Control Module (ACM). The ORC contains the accelerometer and energy reserve capacitor. The ORC is mounted on the tunnel floor pan, forward of the center console.
The accelerometer is located inside the ORC. The accelerometer provides confirmation of a crash, discriminating severity. The ORC monitors the system to determine the system readiness. The ORC may store sufficient energy to deploy the airbags for only two minutes after the battery is disconnected. The ORC contains on-board diagnostics, and will illuminate the AIRBAG warning lamp on the cluster when a fault occurs. The warning equipment is tested for a few seconds every time the vehicle is started.
SIDE IMPACT AIRBAG CONTROL MODULE
Fig.31 Siacm Position/Orientation:
Vehicles equipped with side impact airbags use two Side Impact Airbag Control Modules (SIACM). One is located on each respective side body B-pillar.
Fig.32 Side Impact Airbag System Component Location:
Each Side Impact Airbag Control Module (SIACM) serves as the impact sensor for its seat mounted air- bag. The right side SIACM controls the right seat airbag. The left side SIACM controls the left seat airbag. Each SIACM contains two accelerometers, both accelerometers must agree in order to deploy the side airbag. In the event of a side impact the appropriate SIACM will send a electronic signal to its airbag, deploying the airbag. The SIACM communicates with the occupant restraint controller via the PCI bus circuit.