Lincoln Nautilus: Supplemental Restraint System / Occupant Classification System (OCS) Sensor. Removal and Installation

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 reset when a front passenger seat cushion is disassembled, a new trim cover is installed or an OCS service kit is installed. Use a diagnostic scan tool to carry out the OCS reset command.

NOTICE: The cushion heater mat on a front outboard passenger seat is not serviced separately. If a new cushion heater mat is needed on the front passenger seat, install an OCS service kit equipped with a heater mat. Failure to follow this instruction may result in incorrect operation of the OCS .

NOTE: The OCS components (seat cushion foam, heater mat (if equipped) and OCS ) are calibrated to each other and are serviced as an assembly. The OCS components are not to be installed separately. If a new OCS , seat cushion foam or heater mat (if equipped) are needed, a new OCS service kit must be installed.

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

1. Remove the side shield screws.
   

1. 
   Remove the side shield.
   
   1. Lift up on the rear of the side shield and pull outward.
      
   2. Push the side shield forward.
      
   3. Disconnect the electrical connector.
      

1. Detach the electrical connector retainers and position them aside.
   

1. Detach the backrest cover straps and position the backrest cover aside.
   

1. Detach the cushion cover J-clips and position the cushion cover aside.
   

1. 1. Disconnect the OCS sensor.
      
   2. Disconnect the cushion heater mat electrical connector.
      

1. 
   Detach the seat cushion cover J-clips.
   
   1. On both sides.
      Detach the cushion cover side J-clips.
      
   2. Detach the cushion cover front J-clip.
      

1. Lift the cushion foam. If the cushion foam and OCS are adhered together, then the OCS is a service kit. If nothing is adhered together, then the OCS is original equipment.
   

1. If equipped with an original equipment OCS .
   Remove the cushion foam and cover as an assembly.
   

1. NOTE: Original equipment OCS shown, service kit similar.

   Remove the pin-type retainers and raise the front of the OCS bladder.
   

1. Remove the OCS bracket screw.
   Torque: 44 lb.in (5 Nm)

1. NOTE: Note the location of the OCS hose and heater mat pigtail as it passes through the seat cushion support for proper installation.

   Route out the OCS hose, sensor, sensor bracket and heater mat pigtail from between the seat cushion support wires and remove the OCS .
   

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

   NOTE: Typical OCSM bracket shown.

   Bend the tab up and slide the OCS sensor off the bracket.
   

1. NOTE: Original equipment OCS cushion foam shown, service kit similar.

   Invert the rear portion of the seat cushion cover from the foam.
   

1. NOTICE: Use care when separating the seat cushion trim cover from the hook-and-loop strips or the hook-and-loop strips may be torn from the seat cushion foam.

   NOTICE: Use care when separating the seat cushion from the hook-and-arrow or the hook may be torn from the seat cushion foam.

   NOTE: This step is only necessary when installing a new component.

   
   Remove the seat cushion cover.
   
   1. Invert the seat cushion cover.
      
   2. Release the hook-and-arrows.
      
   3. Release the hook-and-loop strips.
      

Installation

1. NOTICE: Inspect the OCS bladder, seat cushion pan and support assembly for any foreign objects before installing the OCS to the seat cushion pan. Remove any foreign objects. Failure to follow these instructions may result in incorrect operation of the OCS 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. NOTE: Typical OCSM bracket shown.

   Bend the OCS sensor bracket tab back.
   

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 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.