Ford Fiesta: Supplemental Restraint System / Occupant Classification System (OCS) Sensor. Removal and Installation

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 reset when a front passenger seat cushion is disassembled, a new trim cover is installed or an OCS service kit is installed. Use a 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: Removal steps in this procedure may contain installation details.

All seats

1. Remove the front seat.
   Refer to: Front Seat (501-10 Seating, Removal and Installation).
   

1. Recline the seat backrest.
   

1. 1. Remove the bolt cover.
      
   2. Remove the bolt.
      Torque: 35 lb.in (4.0 Nm)
   3. Remove the recline handle.
      

1. 1. If equipped.
      Release the retainer and remove the height adjustment handle.
      
   2. Remove the side shield screw.
      Torque: 27 lb.in (3.0 Nm)
   3. Push the side shield forward and remove the side shield.
      

1. 1. Remove the screw.
      Torque: 27 lb.in (3 Nm)
   2. Pull the recliner cover up then out.
      
   3. Release the clip and remove the recliner cover.
      

Heated seat

1. Disconnect the heated seat electrical connectors and position the wiring harness aside.
   

All seats except Recaro™

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

Recaro™ seat

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

All seats

1. NOTE: Base seat shown, Recaro™ similar.

   Release the seat cushion cover J-clips from the cushion frame.
   

Recaro™ seats

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

   Release the hook-and-loop strips and position aside the cushion cover.
   

1. NOTICE: Use care when separating the cushion trim cover from the hook-and-arrows or the hook can be torn from the cushion foam pad.

   On both sides.
   Release the hook-and-arrows.
   

Seats equipped with original equipment (OE) occupant classification system (OCS)

1. Remove the cushion foam and cover as an assembly.
   

All seats

1. 1. Disconnect the OCS sensor electrical connector.
      
   2. Release the tabs.
      
   3. Remove the OCS sensor from the bracket.
      

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

   Remove the pin-type retainers.
   

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

   Route out the OCS hose and sensor from between the seat cushion support wires and remove the OCS .
   

Recaro™ seats

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 pad.

   NOTICE: Use care when separating the cushion trim cover from the hook-and-arrow strip, or the hook can be torn from the cushion foam pad.

   On both sides.
   Release the hook-and-loop strips, the hook-and-arrows and remove the seat cushion cover.
   

All seats except Recaro™

1. 1. Invert the cushion cover sides.
      
   2. Remove the hog rings.
      
   3. Invert the front and rear of the cushion cover.
      
   4. Remove the hog rings.
      

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.

   To install, reverse the removal procedure.
   Use the General Equipment: Hog Ring Plier

1. During installation, make sure the OCS hose is routed correctly and not kinked or trapped on top of the seat cushion wire supports.
   

1. Install the passenger seat. Do not prove out the SRS at this time.
   Refer to: Front Seat (501-10 Seating, 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 42.8 °F ( 6 °C) or above 96.7 °F ( 36 °C) 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 42.8 °F ( 6 °C) to 96.7 °F ( 36 °C) 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 by turning the ignition from ON to OFF. Wait 10 seconds, then turn the ignition back to ON and monitor the airbag warning indicator with the airbags installed. The airbag warning indicator illuminates continuously for approximately 6 seconds and then turns off. If a SRS fault is present, the airbag warning indicator will fail to light, remain lit continuously, or flash.
   

1. The flashing might not occur until approximately 30 seconds after the ignition has been turned from OFF to ON. This is the time required for the RCM to complete the testing of the SRS . If the airbag warning indicator is inoperative and a SRS fault exists, a chime sounds in a pattern of 5 sets of 5 beeps. If this occurs, diagnose and repair the airbag warning indicator and any SRS faults.
   

1. Clear all continuous Diagnostic Trouble Codes (DTCs) from the RCM and OCSM using a diagnostic scan tool.