Liberty 2WD V6-3.7L (2008)
side front seat is unoccupied or that it is occupied by a load that is inappropriate for an airbag deployment. The ORC also provides a control output to the
passenger airbag on/off indicator through the passenger airbag indicator driver circuit. The OCM notifies the ORC when it has detected a monitored
system fault and stored a DTC in its memory for any ineffective OCS component or circuit, then the ORC sets a DTC and controls the airbag indicator
operation accordingly.
The ORC receives battery current through two circuits; a fused ignition switch output (run) circuit through a fuse in the Totally Integrated Power Module
(TIPM), and a fused ignition switch output (run-start) circuit through a second fuse in the TIPM. The ORC receives ground through a ground circuit and
take out of the instrument panel wire harness. These connections allow the ORC to be operational whenever the ignition switch is in the START or ON
positions. Refer to the appropriate wiring information for additional details.
The ORC also contains an energy-storage capacitor. When the ignition switch is in the START or ON positions, this capacitor is continually being
charged with enough electrical energy to deploy the SRS components for up to one second following a battery disconnect or failure. The purpose of the
capacitor is to provide backup SRS protection in case there is a loss of battery current supply to the ORC during an impact.
Two sensors are contained within the ORC, an electronic impact sensor and a safing sensor. The ORC also monitors inputs from two remote front impact
sensors located on the back of the right and left ends of the front end module carrier inboard of the headlamps near the front of the vehicle. The
electronic impact sensors are accelerometers that sense the rate of vehicle deceleration, which provides verification of the direction and severity of an
impact. The ORC also monitors inputs from an internal rollover sensor and four additional remote impact sensors located on the left and right inner B
and C-pillars to control deployment of the side curtain airbag units.
The safing sensor is an electronic accelerometer sensor within the ORC that provides an additional logic input to the ORC microprocessor. The safing
sensor is used to verify the need for a SRS component deployment by detecting impact energy of a lesser magnitude than that of the primary electronic
impact sensors, and must exceed a safing threshold in order for the airbags to deploy. A second safing sensor within the ORC provides confirmation to
the ORC microprocessor of side impact forces. This second safing sensor is a bi-directional unit that detects impact forces from either side of the vehicle.
Pre-programmed decision algorithms in the ORC microprocessor determine when the deceleration rate as signaled by the impact sensors and the safing
sensors indicate an impact that is severe enough to require SRS protection and, based upon the severity of the monitored impact, determines the level of
front airbag deployment force required for each front seating position. When the programmed conditions are met, the ORC sends the proper electrical
signals to deploy the dual multistage front airbags at the programmed force levels, the front seat belt tensioners and either side curtain airbag unit. For
vehicles equipped with the OCS, the passenger side front airbag and seat belt tensioner will be deployed by the ORC only if enabled by the OCM
messages (passenger airbag on/off indicator OFF) at the time of the impact.
The hard wired inputs and outputs for the ORC may be diagnosed using conventional diagnostic tools and procedures. Refer to the appropriate wiring
information. However, conventional diagnostic methods will not prove conclusive in the diagnosis of the ORC or the electronic controls or
communication between other modules and devices that provide features of the supplemental restraint system. The most reliable, efficient, and accurate
means to diagnose the ORC or the electronic controls and communication related to ORC operation requires the use of a diagnostic scan tool.
