Air Bag Systems: Service and Repair

Occupant Classification Sensor (OCS) System Reset





NOTE: If DTC B2290 is retrieved on-demand from the Occupant Classification System Module (OCSM) and Restraints Control Module (RCM):
- There is a fault with the Occupant Classification Sensor (OCS) weight sensor bolt(s) and/or wiring.
- The cause for the DTC must be corrected before carrying out the OCS system reset.
- Refer to the Supplemental Restraint System (SRS) DTC Chart for diagnostic direction. [1][2]Diagnostic Trouble Code Descriptions
- The RCM stores DTC B2290 in memory ONLY to identify a problem with the OCS system.

If DTC B2290 is only present in the RCM and no on-demand or continuous DTC are present in the OCSM, CLEAR all DTCs from the RCM.

1. Diagnostic Instruction: The Occupant Classification Sensor (OCS) System Reset procedure should only be carried out if instructed to do so by the diagnostic/repair information.

If the concern is with the Passenger Air Bag Deactivation (PAD) indicator operation, refer to Passenger Air Bag Deactivation (PAD) Indicator and Occupant Classification Sensor (OCS) System in Description and Operation.

WARNING: The following precautions must be taken before carrying out the following procedure on the front passenger seat:
- Park the vehicle on level ground.
- Make sure the occupant classification sensor (OCS) system is stabilized at a temperature in the range of 5°C to 48°C (41°F to 118°F) and is not exposed to temperatures outside that range.
- Make sure the front passenger seat is empty and dry.
- Make sure the front passenger seat repair is complete and all attached components (head restraint, seat side shield) are correctly installed.
- Make sure nothing is placed in the map pockets (if equipped) of the front passenger seat.
- Make sure nothing is underneath the front passenger seat.
- Make sure no non-factory installed items (seat covers, DVD screens) are on or contacting the front passenger seat. If any non-factory items were installed to the seat, remove the item(s) and communicate to the customer that any alteration/modification to the front passenger seat may affect performance of the OCS system. Refer to the Owner's Literature.
- Make sure the seat is correctly installed in the vehicle.
Failure to follow these instructions may result in incorrect operation of the OCS system and increases the risk of serious personal injury or death in a crash.

NOTICE: Correct seat track alignment of the inboard and outboard seat tracks on a manual seat is critical for a successful system reset. Before removing a front passenger seat equipped with a manual seat track, mark both tracks to indicate correct alignment between the inboard and outboard tracks. Failure to follow this instruction will result in an unsuccessful system reset and incorrect operation of the Occupant Classification Sensor (OCS) system.

NOTICE: Make sure the Occupant Classification Sensor (OCS) system weight sensor bolt protection brackets are correctly installed to the seat track and that they not contact the cushion side shield, wire harness or any other surrounding parts. Failure to follow this instruction may result in the incorrect operation of the OCS system.

NOTE: In the event of a deployable crash and OCSM DTC B1231 is retrieved on-demand, the DTC must be cleared before carrying out the Occupant Classification Sensor (OCS) System Reset.

2. NOTE: If a new OCS system component has been installed, the RCM and OCSM will:
- store DTC B1013 and B2290 in memory.
- cause the air bag warning indicator to illuminate.
- clear after a successful system reset.
- the RCM stores DTC B2290 in memory.

Turn the ignition to the off position. Wait 10 seconds, then turn the ignition back to ON and visually monitor the air bag warning indicator. The air bag warning indicator will light continuously for approximately 6 seconds and then turn OFF. If no SRS DTCs are present and no new OCS system components were installed, the air bag warning indicator will remain off. If the air bag warning indicator illuminates, indicating a fault is present, use a scan tool to retrieve DTCs and refer to the DTC Charts for diagnostic direction before carrying out the system reset procedure. [1][2]Diagnostic Trouble Code Descriptions

3. Cycle the ignition to the OFF position.

4. NOTICE: The following seat checks must be made before attempting to carry out an Occupant Classification Sensor (OCS) system reset after the seat has been removed and re-installed for any reason:
- Make sure the seat is correctly installed in the vehicle.
- Make sure the seat has been tightened to specification as identified in the diagnostic/repair information.
- Make sure the seat track is correctly aligned (manual seat track).
- Make sure the OCS weight sensor bolt harness connections are correct for each sensor at their correct location. Refer to Wiring Diagrams Set 46 for schematic and connector information. Refer to the illustration for correct sensor location on the seat. Diagrams By Number
Occupant Classification Sensor (OCS) Weight Sensor Bolt Location
- OCS weight sensor bolt 1, front outboard
- OCS weight sensor bolt 2, rear outboard
- OCS weight sensor bolt 3, rear inboard
- OCS weight sensor bolt 4, front inboard


NOTE: Due to the sensitivity of the OCS system and backrest position, the seat backrest may require repositioning to several different locations for a successful System Reset to occur.

Position the front passenger seat.
- Position the seat backrest in a typical upright seated position.

- Position the seat in the middle position of seat track travel.

- Position the seat height to its middle position (power seat only).





5. Remove the hysteresis from the front passenger seat by firmly hitting the back of the seat head restraint 3 times.

6. NOTE: Make sure a minimum 8-second time period has passed after cycling the ignition ON before carrying out the System Reset active command.

Turn the ignition ON, wait 8 seconds and carry out the System Reset.

- If the system passed, go to Occupant Classification Sensor (OCS) System Zero Seat Weight Test Component Tests and General Diagnostics.

- NOTE: Do not install any new OCS system components at this time. OCS system components should only be installed when directed to do so.

If the system did not pass, proceed to Step 7.

7. Reposition the front seat backrest to a slightly reclined position, proceed to Step 5. If seat backrest has been repositioned several times and the System Reset is still unsuccessful, proceed to Step 8.

8. Carry out the OCSM self-test.
- If DTCs B2290 and B1013 are retrieved on-demand in the OCSM, refer to the DTC Charts for diagnostic direction. Carry out diagnostics for DTC B2290 before any other DTCs. [1][2]Diagnostic Trouble Code Descriptions

- If any other DTC is retrieved on-demand in the OCSM, refer to the DTC Charts for diagnostic direction. [1][2]Diagnostic Trouble Code Descriptions

- If only DTC B1013 is retrieved on-demand in the OCSM, refer to the DTC Charts for diagnostic direction. [1][2]Diagnostic Trouble Code Descriptions