LEMON Manuals: Even more car manuals for everyone: 1960-2025
Home >> Ford >> 2003 >> Mustang Base, 2D Convertible, Automatic >> Repair and Diagnosis >> External Pages >> Different car >> Section 1401 (Supplemental Inflatable Restraint System) >> Removal And Installation >> Occupant Classification Sensor - Original Equipment >> Installation
April 5, 2026: LEMON Manuals is launched! Read the announcement.

Occupant Classification Sensor - Original Equipment: Installation

WARNING: This page is about a different car, the 2006 Mercury Montego, 2006 Ford Freestyle, and 2006 Ford Five Hundred. However, it is still accessible from the selected car via links, so may be relevant.
NOTE: If installing an OCS service kit, refer to OCCUPANT CLASSIFICATION SENSOR - SERVICE KIT .

    All seats 

  1. Bend the retaining tab back on the pressure sensor bracket.
    Fig 1: Bending Retaining Tab Back On Pressure Sensor Bracket
    G04659672Courtesy of FORD MOTOR CO.
    2. NOTE: The ECU must be correctly positioned and securely riveted in place. Failure to do so can set a diagnostic trouble code (DTC) in the restraints control module.
    Fig 2: Locating ECU Rivets
    G04659673Courtesy of FORD MOTOR CO.
  2. Install the ECU and rivets to the seat cushion frame bracket.
  3. Connect the ECU electrical connector.
    Fig 3: Locating ECU Electrical Connector
    G04659674Courtesy of FORD MOTOR CO.
    4. WARNING: Do not separate components.
    CAUTION:
    1. Inspect the occupant classification sensor bladder, seat cushion frame and support assembly for any foreign objects, before installing the occupant classification sensor assembly to the seat cushion frame. If any foreign objects are found, remove them. Failure to do so may result in personal injury, in the event of an air bag deployment.
    2. Failure to route the seat occupant sensor components through the correct seat cushion support opening can cause component failure.
    3. While positioning the seat cushion frame and occupant classification sensor assembly, be careful not to damage any of the components. Failure to do so can result in component failure.
    NOTE: If the original equipment occupant classification sensor (OCS) is not being installed, install a service kit OCS using all parts in the kit.
    Fig 4: Locating OCS Bladder, Hose & Pressure Sensor In Seat Cushion Frame
    G04659675Courtesy of FORD MOTOR CO.
  4. Position the OCS bladder to the seat cushion frame.
    • Feed the pressure sensor and hose through the center opening in the seat cushion frame support assembly.
  5. Install the OCS bladder pin-type retainers.
    Fig 5: Locating OCS Bladder Pin-Type Retainers
    G04659676Courtesy of FORD MOTOR CO.
    6. NOTE: When the pressure sensor is installed correctly, an audible click will be heard and the pressure sensor will not be able to be removed from its bracket without disengaging the retaining tab.
    Fig 6: Locating Pressure Sensor Electrical Connector
    G04659677Courtesy of FORD MOTOR CO.
  6. Install the pressure sensor.
    • Make sure the pressure sensor hose is routed correctly and is not kinked during installation.
    • Install the pressure sensor onto the seat cushion frame bracket.
    • Make sure the retaining tab is completely engaged.
    • Connect the electrical connector.
    7. CAUTION: Inspect the seat cushion pad and seat cushion trim cover for any foreign objects, before installing the seat cushion trim cover and the seat cushion pad. If any foreign objects are found, remove them. Failure to do so may result in personal injury, in the event of an air bag deployment.
  7. Position the seat cushion pad and seat cushion trim cover to the seat cushion frame, then attach the hook and loop strip at the rear of the seat cushion trim cover.
  8. Attach all the seat cushion trim cover J-clips.

    9. Seats with heat 

  9. Connect the heated seat electrical connector.

    10. Seats with power 

  10. Install the power seat control switch to the side shield.

    11. All seats 

  11. Install the side shield and rear screw.

    12. Seats with power 

  12. Install the power seat switch knobs.

    13. Seats with manual recline 

  13. Install the recline handle.

    14. All seats 

  14. Install the passenger seat. For additional information, refer to SEATING .
  15. Repower the SRS. Do not prove out the SRS at this time  . For additional information, refer to SUPPLEMENTAL RESTRAINT SYSTEM (SRS) DEPOWERING AND REPOWERING .
    16. WARNING: Do not separate components.
    CAUTION:
    1. 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 diagnostic tool is used to trigger the active command to carry out rezeroing of the OCS system.
    2. Make sure the seat is completely assembled before rezeroing.
    NOTE:
    1. For best results in rezeroing, the OCS system should be at or near room temperature, 10°C to 29°C (50°F to 85°F).
    2. If the first attempt to rezero the OCS system is unsuccessful, a second attempt must be made.
  16. The following precautions must be taken before rezeroing the OCS system.
    • Make sure the OCS system components are connected and no faults are present.
    • Make sure the OCS system is not at a temperature below 0°C (32°F) or above 45°C (113°F) when initiating the rezeroing process. If the vehicle has been exposed to extreme cold or hot temperatures, the vehicle must be exposed and kept at a temperature within the limits, 0°C to 45°C (32°F to 113°F) for a minimum of 30 minutes.
    • 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 eight second time period has passed after cycling the ignition switch ON before the rezeroing process.

    Rezero the occupant classification sensor.

    • With the front passenger seat empty, use a diagnostic tool to trigger the active command and rezero the OCS.
    17. NOTE: The ignition switch must be cycled after rezeroing the OCS system.
  17. Cycle the ignition switch from ON to OFF.
  18. Prove out the SRS as follows:

    Turn the ignition key from ON to OFF. Wait 10 seconds, then turn the key back to ON and visually monitor the air bag indicator with the air bag modules installed. The air bag indicator will light continuously for approximately 6 seconds and then turn off. If an air bag SRS fault is present, the air bag indicator will:

    • Fail to light.
    • Remain lit continuously.
    • Flash.

    The flashing might not occur until approximately 30 seconds after the ignition switch has been turned from the OFF to the ON position. This is the time required for the restraints control module (RCM) to complete the testing of the SRS. If the air bag indicator is inoperative and a SRS fault exists, a chime will sound in a pattern of 5 sets of 5 beeps. If this occurs, the air bag indicator and any SRS fault discovered must be diagnosed and repaired.

    Clear all continuous DTCs from the RCM using a diagnostic tool.

  19. Check the active restraint system for correct operation. For additional information, refer to SAFETY BELT SYSTEM .
scientia non olet · About LEMON Manuals