Lincoln Aviator: Supplemental Restraint System / Removal and Installation - Occupant Classification System (OCS) Sensor - Vehicles With: Multi-Contour Seats

Special Tool(s) / General Equipment

Removal

  WARNING: The following procedure prescribes critical repair steps required for correct restraint system operation during a crash. Follow all notes and steps carefully. Failure to follow step instructions may result in incorrect operation of the restraint system and increases the risk of serious personal injury or death in a crash.

NOTICE: To prevent system failure, carry out the OCS (occupant classification system) reset when a front passenger seat cushion is disassembled, a new trim cover or heater mat is installed or an OCS (occupant classification system) service kit is installed. Use a diagnostic scan tool to carry out the OCS (occupant classification system) reset command.

NOTE: The OCS (occupant classification system) components (seat cushion foam and trim cover, plastic carrier, and OCS (occupant classification system) bladder with OCSM (occupant classification system module), MCS (multi-contour seat) bolster bladders (optional), heat/vent bag (optional)) are calibrated to each other and serviced as an assembly. The OCS (occupant classification system) service kit components are not to be installed separately. If a new OCS (occupant classification system) or OCS (occupant classification system) components are needed, a new OCS (occupant classification system) service kit must be installed. A new passenger seat cushion cover and the heater mat can be installed separately.

NOTE: Removal steps in this procedure may contain installation details.

1.   WARNING: Before beginning any service procedure in this manual, refer to health and safety warnings in section 100-00 General Information. Failure to follow this instruction may result in serious personal injury.

   Refer to: Pyrotechnic Device Health and Safety Precautions (100-00 General Information, Description and Operation).
   

1. Raise and extend the front seat leg extensions.
   

1. NOTE: Follow the unique instructions or graphic for this step in the installation.

   Remove the front passenger seat.
   Refer to: Front Seat (501-10A Front Seats, Removal and Installation).
   

1. 
   Release the front seat backrest panel straps.
   
   1. Detach the electrical connector and wiring harness retainers and position them aside.
      
   2. Detach the backrest cover straps.
      

1. 1. Disconnect the front seat cushion heater mat electrical connector.
      
   2. Disconnect the OCS sensor electrical connector.
      
   3. Remove the screw and position the OCS sensor and bracket aside.
      Torque: 44 lb.in (5 Nm)

1. Release the front seat cushion cover J-clips from the leg extensions.
   

1. Remove the front seat backrest panel with power head restraint.
   Refer to: Front Seat Backrest Panel (501-10A Front Seats, Removal and Installation).
   

1. NOTE: After disconnecting the hose and lock assemblies, verify the black O-ring and white spacer remains with each hose.

   NOTE: When connecting the hose and lock assemblies, an audible click must be heard for correct installation.

   Detach the multi-contour seat cushion hose retainers, release the locking tab, disconnect the hose coupling from the SCMH and route the hose assembly out from the backrest.
   

1. At the attachment points, slide the front seat cushion and OCS assembly rearward and upward, detaching the carrier from the cushion module.
   

1. 1. NOTE: Only the carrier portion of the seat cushion and OCS (occupant classification system) assembly is shown.

      Push the rear of the front seat cushion and OCS assembly up, disengaging the carrier from the locator pins.
      
   2. Pull the seat cushion and OCS assembly out from between the seat track and backrest.
      

1. NOTE: For correct installation, note the location of the cushion heater mat wiring harness pigtail as it passes through the seat.

   
   Remove the front seat cushion foam and cover as an assembly.
   
   • Pull the front seat cushion cover, foam and heater mat pigtail out from between the seat track and backrest.
     

1. NOTE: For proper installation, note the location of the OCS (occupant classification system) hose and multi-contour seat hose assembly as they pass through the seat.

   NOTE: Follow the unique instructions or graphic for this step in the installation.

   
   Remove the front seat cushion and OCS assembly.
   
   1. Lift the front seat cushion and OCS assembly off the seat track.
      

   2. NOTICE: During installation, do not kink the OCS (occupant classification system) hose or the SRS (supplemental restraint system) will not operate correctly.

      Route out the OCS hose with sensor.

   3. NOTICE: During installation, do not kink the multi-contour seat hose assembly or the multi-contour seat will not operate correctly.

      If equipped with multi-contour seat.
      Route out the multi-contour seat hose assembly.
      

1. NOTE: This step is only necessary if installing a new OCS (occupant classification system).

   NOTE: Follow the unique instructions or graphic for this step in the installation.

   Bend the tab away from the OCS sensor and slide the sensor off the bracket.
   

Installation

1. NOTICE: Inspect the OCS (occupant classification system) bladder, seat cushion pan and support assembly for any foreign objects before installing the OCS (occupant classification system) to the seat cushion pan. Remove any foreign objects. Failure to follow these instructions may result in incorrect operation of the OCS (occupant classification system) and may cause system failure.

   NOTICE: Do not trap the pressure sensor hose incorrectly over the seat's suspension or spring. Route the hose so that it lays in a natural bend, and is not twisted due to being forced into an unnatural position. Failure to follow these instructions may result in component damage and/or system failure.

   To install, reverse the removal procedure.
   

1. If required.
   Install a new cushion heater mat.
   Refer to: Seat Heater Mat Installation (501-10A Front Seats, General Procedures).
   

1. Bend the OCS sensor bracket tab back.
   Use the General Equipment: Flat Headed Screw Driver

1. Install the front passenger seat. Do not prove out the SRS at this time.
   Refer to: Front Seat (501-10A Front Seats, Removal and Installation).
   

1.   WARNING: Occupant Classification System (OCS) parts are calibrated as an assembly and must only be replaced in the configuration they are sold. Never separate parts of an assembly. Failure to follow this instruction may result in incorrect operation of the OCS and increases the risk of serious personal injury or death in a crash.

     WARNING: Make sure the front passenger seat repair is complete, the seat and all attached components (head restraint, seat side shield, etc.) are correctly assembled, and the seat is correctly installed to the vehicle before using System Reset to rezero the seat weight. Failure to follow these instructions may result in incorrect operation of the occupant classification system (OCS) and increases the risk of serious personal injury or death in a crash.

   NOTICE: To prevent system failure, take the following precautions before carrying out the OCS (occupant classification system) reset.

   • Make sure the voltage to the OCSM is greater than 8 volts and less than 18 volts.
   • Make sure the OCS is not below 6º C (42.8º F) or above 36º C (96.7º F) when initiating the OCS reset process. If the vehicle has been exposed to extreme cold or hot temperatures, the vehicle must be exposed and kept at a temperature between 6º C (42.8º F) to 36º C (96.7º F) for a minimum of 30 minutes.
   • Make sure nothing is present on the passenger seat before and during the OCS reset process.
   • Prior to carrying out the OCS reset, make sure a minimum of 8 seconds has elapsed after cycling the ignition switch on.
   Using a diagnostic scan tool, carry out the OCS reset. Cycle the ignition switch after the OCS reset.
   

1. If the first system reset attempt was successful, proceed to prove out the SRS.
   

1. If the first system reset attempt was not successful, carry out a thorough visual inspection of the OCS connector and wiring for damage, pressure sensor hose for kinks and or damage, and seat-related wiring harness and body wiring harness terminals and connectors for damage. Repair any concerns found and proceed to the next step.
   

1. Carry out a second OCS reset. Cycle the ignition switch after the OCS reset. If the second attempt is unsuccessful, install a new OCS service kit.
   

1. Prove out the SRS. Verify all airbags are installed and connected and the ignition is OFF. Wait 10 seconds then turn the ignition ON and monitor the airbag warning indicator. The airbag warning indicator illuminates continuously for approximately 6 seconds and turns off. Continue to monitor the airbag warning indicator for approximately 30 seconds, as this is the time required for the RCM to complete testing of the SRS.
   
   • If a SRS fault is present, the airbag warning indicator either fails to light, remains lit continuously or flashes. The flashing may not occur until approximately 30 seconds after the ignition has been turned from OFF to ON. If this occurs, diagnose and repair any SRS faults before proceeding with other repairs.
     
   • If, after the ignition has been turned on for 30 seconds, the airbag warning indicator remains unlit with no chime or SRS message displayed in the message center, no SRS fault is present.
     
   • If the airbag warning indicator is inoperative and a SRS fault exists, a chime sounds in a pattern of 5 sets of 5 beeps or a message displays in the message center. If this occurs, diagnose and repair the airbag warning indicator and any SRS faults before proceeding with other repairs.
     

1. Using a diagnostic scan tool, clear all Continuous Memory Diagnostic Trouble Codes (CMDTCs) from all modules.