Ford Focus Service Manual: Occupant Classification Sensor

Vehicle Communication Module (VCM) and Integrated Diagnostic System (IDS) software with appropriate hardware, or equivalent scan tool

Production Occupant Classification System (OCS) System

Removal

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: It is necessary to carry out the Occupant Classification System (OCS) system reset when a front passenger seat cushion is disassembled, a new trim cover is installed or an OCS system service kit is installed. A scan tool is used to carry out the OCS system reset. Failure to follow this instruction may result in system failure and the incorrect operation of the OCS system.

NOTE:

Occupant Classification System (OCS) system components, seat cushion foam pad, bladder with pressure sensor and Occupant Classification System Module (OCSM) , are calibrated to each other and are serviced as an assembly. If a new OCS system or OCS system component is needed, a new OCS system service kit must be installed.

NOTE:

To identify between a production OCS system and a OCS system service kit, inspect the OCSM and pressure sensor electrical connectors. An OCS system service kit has the electrical connectors glued and should not be disconnected or altered.

NOTE:

The heater mat is not serviceable separately. If a new heater mat is needed on the front passenger seat cushion, a new OCS system service kit with a heater mat must be installed.

NOTE:

The air bag warning indicator illuminates when the correct Restraints Control Module (RCM) fuse is removed and the ignition is ON.

NOTE:

The Supplemental Restraint System (SRS) must be fully operational and free of faults before releasing the vehicle to the customer.

1. Depower the SRS . For additional information, refer to Supplemental Restraint System (SRS) Depowering and Repowering in the General Procedures portion of this section.

1. Remove the passenger seat. For additional information, refer to Section  501-10.

1. Remove the recliner lever cover.
   • Release the recliner lever cover from the locking tab then remove the recliner lever cover.

1. NOTE:

   Return any detached retainer clips to the side shield before installation.

   Remove the seat cushion side shield.

   • Remove the 2 screws.
   • Release the side and rear retainer clips.

1. Detach the 2 backrest cover elastic straps at the rear of the seat cushion frame.

1. Remove the screw from the seat cushion cover J-clip behind the front edge of the seat cushion frame.

1. NOTE:

   Note position of wire routing for installation.

   Release the seat cushion cover J-clips.

   • Release the hook-and-loop strip at the rear of the seat.

1. If equipped, disconnect the seat cushion and backrest heater mat electrical connectors.

1. Remove the 2 hog rings attaching the seat cushion cover rear flaps to the seat cushion foam.

1. Remove the remaining 6 hog rings and remove the seat cushion cover from the seat cushion foam.

1. Remove the seat cushion foam pad from the seat frame.

1. NOTE:

   Note position of wire routing for installation.

   Release the 2 seat wiring harness routing clips from the seat cushion frame.

1. Release the 2 OCS bladder pin-type retainers from the seat cushion pan.

1. Release the pressure sensor bracket retainer and slide the pressure sensor off the bracket.

1. Remove the OCSM .
   1. Remove the 2 screws.
   1. Release the bracket retainer and slide the OCSM out of the bracket.

1. NOTE:

   Note position of wire routing for installation.

   Route the OCS bladder hose and pressure sensor, OCSM and seat wiring harness out through the seat cushion frame opening.

1. To install, reverse the removal procedure.

1. Repower the SRS . Do not

   prove out the SRS at this time. For additional information, refer to Supplemental Restraint System (SRS) Depowering and Repowering in the General Procedures portion of this section.

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 passenger airbag and increases the risk of serious personal injury or death in a crash.

   NOTICE: To prevent system failure, the following precautions must be taken before carrying out the Occupant Classification System (OCS) system reset:

   • Make sure the voltage to the Occupant Classification System Module (OCSM) is above 8 volts and less than 18 volts.
   • Make sure the OCS system is not at a temperature below 6°C (42°F) or above 36°C (97°F) when initiating the OCS system reset 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, 6°C to 36°C (42°F to 97°F) for a minimum of 30 minutes.
   • Make sure nothing is present on the passenger seat before carrying out the OCS system reset and nothing is placed on the seat during the process.
   • Make sure a minimum 8-second time period has passed after cycling the ignition switch ON before the carrying out the OCS system reset.

   Carry out the OCS system reset.

1. If the first system reset attempt was unsuccessful, carry out a thorough visual inspection of the following and repair any concerns found.
   • OCS system connector and wiring for damage
   • Pressure sensor hose for kinks and/or damage
   • Seat-related wiring harness and body wiring harness terminals and connectors for damage

1. NOTE:

   The ignition switch must be cycled after the OCS system reset.

   Carry out a second OCS system reset. If the second attempt is unsuccessful, install a new OCS system service kit. For additional information, refer to Occupant Classification System in Section  501-20B.

1. Prove out the SRS as follows: Turn the ignition switch from ON to OFF. Wait 10 seconds, then turn the ignition switch back to ON and visually monitor the air bag warning indicator with the air bag modules installed. The air bag warning indicator will light continuously for approximately 6 seconds and then turn off. If an air bag SRS fault is present, the air bag warning indicator will: — fail to light.
   — remain lit continuously. — flash at a 5Hz rate (RCM not configured). The air bag warning indicator might not light 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 RCM to complete the testing of the SRS . If the air bag warning 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 warning indicator and any SRS fault discovered must be diagnosed and repaired. Clear all RCM and OCSM DTCs using a scan tool.