Occupant Classification Sensor

WARNING: This page is about a different car, the 2004 Mercury Marauder, 2004 Mercury Grand Marquis, and 2004 Ford Crown Victoria. However, it is still accessible from the selected car via links, so may be relevant.

CAUTION: If installing only the front passenger seat cushion trim cover, the seat occupant classification sensor (OCS) must be rezeroed.

CAUTION: The following precautions must be taken before rezeroing of the OCS system.

Make sure the OCS system components are connected and no faults are present.
Make sure the vehicle has not been exposed to temperatures below 6°C (42° F) or above 36 °C (97 °F) within four hours prior to the rezeroing process. If the vehicle has been exposed to temperatures outside the temperature limits (6-36°C [42-97°F]), the vehicle must be exposed to and kept at a temperature within the limits for minimum of four hours.
Make sure nothing is present on the passenger seat before rezeroing and nothing is placed on the seat during the rezeroing process.
Make sure a minimum five second time period has passed after cycling the ignition switch ON before the rezeroing process.

NOTE: The occupant classification sensor is found only on the front passenger seat and is not equipped on all vehicles. A white tag having the letters "OCS" (occupant classification sensor) will appear under the front of the passenger seat to identify a seat equipped with an occupant classification sensor.

NOTE: It is necessary to rezero the OCS system when a front passenger seat cushion is disassembled, a new trim cover installed, or an OCS service kit is installed. A scan tool is used to trigger the active command to carry out rezeroing of the OCS system.

NOTE: When using a New Generation Star (NGS) tester, the OCS system rezero function is on the Ford Service Function (red) card. To rezero the OCS system:

select SERVICE BAY FUNCTIONS
select RCM
select SYSTEM RESET
select the vehicle from the menu
view the on-screen information then press TRIGGER

The NGS screen will then display OCS RESET: REZERO. Press DONE (button 8) to rezero the OCS system.

The NGS will return to the vehicle menu once rezeroing of the OCS system is complete.

NOTE: To rezero the OCS system using the Worldwide Diagnostic System (WDS):

select the Toolbox icon
select Body from the menu
select Restraints from the menu
select Seat Weight Sensor ReZero

After selecting Seat Weight Sensor ReZero, follow the on-screen prompts to carry out rezeroing of the OCS system.

NOTE: If the first attempt to rezero the OCS system is unsuccessful, a second attempt must be made.

NOTE: Depower the system. For additional information, refer to AIR BAG RESTRAINT SYSTEMS

The seat occupant classification sensor system is found only on the front passenger seat. The OCS system components (seat cushion foam pad, bladder, bladder with pressure sensor and electronic control unit) are calibrated to each other and are serviced as an assembly. OCS system components are not to be installed separately. If installing a new OCS system, OCS system component or seat cushion foam pad, a new OCS system service kit (seat cushion foam pad, bladder, bladder with pressure sensor and electronic control unit) must be installed as an assembly. For additional information, refer to AIR BAG RESTRAINT SYSTEMS .