MODULE, Occupant Restraint Controller

DESCRIPTION

DESCRIPTION

The Occupant Restraint Controller (ORC) (1) is secured with four nuts to four studs on a stamped steel mounting bracket welded onto the top of the floor panel transmission tunnel between the two front seats beneath the floor console and rearward of the transmission gearshift mechanism in the passenger compartment of the vehicle. Concealed within a hollow in the center of the molded plastic ORC housing is the electronic circuitry of the ORC which includes a microprocessor, an electronic impact sensor, an electronic safing sensor, and an energy storage capacitor. A molded plastic end cover plate with a rubber O-ring seal is secured to the open end of the ORC housing with two integral latch features to enclose and protect the internal electronic circuitry and components.

An arrow (2) printed on the label (3) on the top of the ORC housing provides a visual verification of the proper orientation of the unit, and should always be pointed toward the front of the vehicle. The ORC housing has four integral mounting flanges (5) with metal sleeves to provide crush protection. Two molded plastic electrical connector receptacles (4) are integral to the end cover plate. These receptacles connect the ORC to the vehicle electrical system through dedicated take outs and connectors from the instrument panel and the body wire harnesses.

The impact sensor and safing sensor internal to the ORC are calibrated for the specific vehicle, and are only serviced as a unit with the ORC. In addition, there are unique versions of the ORC for vehicles with or without optional seat-mounted side airbags. The ORC cannot be repaired or adjusted and, if damaged or ineffective, it must be replaced.

OPERATION

OPERATION

The microprocessor in the Occupant Restraint Controller (ORC) contains the Supplemental Restraint System (SRS) logic circuits and controls all of the SRS components. The ORC uses On-Board Diagnostics (OBD) and can communicate with other electronic modules in the vehicle as well as with the diagnostic scan tool using the Controller Area Network (CAN) data bus. This method of communication is used for control of the airbag indicator in the ElectroMechanical Instrument Cluster (EMIC) (also known as the Cab Compartment Node/CCN) and for SRS diagnosis and testing through the 16-way data link connector located on the driver side lower edge of the instrument panel.

The ORC microprocessor continuously monitors all of the SRS electrical circuits to determine the system readiness. If the ORC detects a monitored system fault, it sets an active and stored Diagnostic Trouble Code (DTC) and sends electronic messages to the EMIC over the CAN data bus to turn ON the airbag indicator. An active fault only remains for the duration of the fault, or in some cases for the duration of the current ignition switch cycle, while a stored fault causes a DTC to be stored in memory by the ORC. For some DTCs, if a fault does not recur for a number of ignition cycles, the ORC will automatically erase the stored DTC. For other internal faults, the stored DTC is latched forever.

On vehicles so equipped, the ORC provides voltage to the seat track position sensors on the inboard passenger and driver side front seat upper seat tracks. The ORC then monitors return inputs from each of the sensors on dedicated hard wired data communication circuits. The seat track position sensors provide additional logic inputs to the ORC microprocessor that allow it to determine the position of the front seat passenger and the driver relative to the front airbags for determining the force level with which to deploy the multistage front airbags.

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 that is secured by a ground screw to the body sheet metal. 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.

Various sensors within the ORC are continuously monitored by the ORC logic. These internal sensors, along with several external impact sensor inputs allow the ORC to determine both the severity of an impact and to verify the necessity for deployment of any SRS components. Two remote front impact sensors are 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.

On vehicles equipped with optional seat-mounted side (thorax) airbags the ORC also monitors inputs from an internal rollover sensor and two additional remote impact sensors located on the left and right inner B-pillars to control deployment of the seat airbag units.

The impact sensors within the ORC are electronic accelerometer sensors that provide additional logic inputs to the ORC microprocessor. These sensors are 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 SRS components to deploy. A separate impact sensor within the ORC provides confirmation to the ORC microprocessor of side impact forces. This separate 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, if the vehicle is so equipped, either seat airbag unit.

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 SRS. The most reliable, efficient, and accurate means to diagnose the ORC or the electronic controls and communication related to SRS operation requires the use of a diagnostic scan tool. Refer to the appropriate diagnostic information.

REMOVAL

REMOVAL

1. Disconnect and isolate the battery negative cable. Wait two minutes for the system capacitor to discharge before further service.

 
2. Remove the center console from the top of the floor panel transmission tunnel. (Refer to 23 - Body/Interior/CONSOLE, Center - Removal) .

 
3. Unlatch and disconnect the instrument panel wire harness (4) and body wire harness (3) connectors (2) from the Occupant Restraint Controller (ORC) (1) connector receptacles located on the right side of the module. To disconnect the wire harness connectors from the ORC, depress the release tab and lift the lever arm on each connector.
   
   

 
4. Remove the four nuts (1) that secure the ORC (2) to the three studs on the ORC mount (3) welded onto the top of the floor panel transmission tunnel.

 
5. Remove the ORC from the ORC mount.
   

 

INSTALLATION

INSTALLATION

1. Carefully position the Occupant Restraint Controller (ORC) (2) onto the four studs of the ORC mount (3) on the floor panel transmission tunnel. When the ORC is correctly positioned, the bottom of the housing will fit flush with the mount and the orientation arrow on the label on top of the housing will be pointed forward in the vehicle.

 
2. Install and tighten the four nuts (1) that secure the ORC to the studs of the ORC mount. Tighten the nuts to 11N·m (97 in. lbs.).
   
   

 
3. Reconnect the body wire harness (3) and instrument panel wire harness (4) connectors (2) to the ORC connector receptacles located on the right side of the module (1). Be certain that the latches on the connectors are each fully engaged.

 
4. Reinstall the center console onto the top of the floor panel transmission tunnel. (Refer to 23 - Body/Interior/CONSOLE, Center - Installation) .

 
5. Do not reconnect the battery negative cable at this time. The Supplemental Restraint System (SRS) Verification Test procedure should be performed following service of any SRS component. (Refer to 10 - Restraints - Standard Procedure) .