Occupant Classification Sensor - Original Equipment: Installation

WARNING: This page is about a different car, the 2010 Mercury Mariner and 2010 Ford Escape. However, it is still accessible from the selected car via links, so may be relevant.

NOTE: To prevent system failure, it is necessary to carry out the Occupant Classification Sensor (OCS) system reset when a front passenger seat cushion is disassembled, a new trim cover installed or an OCS system service kit is installed. A scan tool is used to carry out the OCS system reset command.

NOTE: Do not install a new cushion heater mat on a front passenger seat cushion, it is not serviceable separately. If a new cushion heater mat is needed on the front passenger seat, an Occupant Classification Sensor (OCS) system service kit equipped with a heater mat must be installed. Failure to follow this instruction may result in incorrect operation of the OCS system.

Bend the retaining tab back on the pressure sensor component bracket.

Fig 1: Bending Retaining Tab Back On Pressure Sensor Component Bracket
Courtesy of FORD MOTOR CO.

NOTE: Inspect the Occupant Classification Sensor (OCS) bladder, seat cushion pan and support assembly for any foreign objects before installing the OCS to the seat cushion pan. If any foreign objects are found, remove them. Failure to follow these instructions may result in incorrect operation of the OCS system and may cause system failure.

NOTE: Route the seat Occupant Classification Sensor (OCS) components through the correct seat cushion support opening. Failure to follow these instructions may result in component damage and/or system failure.

NOTE: While positioning the seat cushion pan and Occupant Classification Sensor (OCS) assembly, be careful not to damage any of the components.

Fig 2: Feeding OCS Components

Courtesy of FORD MOTOR CO.

Feed the OCS components (pressure sensor and hose) through the seat cushion pan opening.
Align the OCS bladder to the seat cushion pan.
Install the 2 pin-type retainers to the OCS bladder and seat cushion pan.

NOTE: Make sure the pressure sensor hose is not kinked during installation.

Install the pressure sensor onto the seat cushion pan bracket, making sure the retaining tab is completely engaged.
- When 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.
Slide the OCSM into the seat cushion pan bracket and install the rivets.
- The OCSM must be correctly positioned and securely fastened in place. Failure to do so can set a DTC in the RCM .
Position the foam pad to the seat cushion pan.

NOTE: Inspect the seat cushion pad and seat cushion trim cover for any foreign material, before installing the seat cushion trim cover to the seat cushion pad. If any foreign material is found, remove it. Failure to follow these instructions may result in incorrect operation of the Occupant Classification Sensor (OCS) system and may cause system failure.

Fig 3: Identifying Seat Cushion Trim Cover J-Clips

Courtesy of FORD MOTOR CO.

Install the seat cushion trim cover to the seat cushion foam pad and attach the J-clips.

NOTE: Inspect the seat cushion pad and seat cushion trim cover for any foreign objects, before installing the seat cushion trim cover to the seat cushion pad. If any foreign objects are found, remove them. Failure to follow these instructions may result in incorrect operation of the Occupant Classification Sensor (OCS) system and may cause system failure.

Position the seat cushion and pan assembly to the seat track.
- To aid in installation, recline the seat backrest.
Install the 4 seat track-to-cushion frame bolts.
- Tighten to 25 Nm (18 lb-ft).
Connect the electrical connectors and wiring clips.
1. Connect the OCSM electrical connector.
2. Connect the pressure sensor electrical connector.
3. Install the 2 wiring clips on the wiring harness to the seat cushion pan.
4. If equipped with heated seats, connect the heated seat relay electrical connector, install the wiring clip on the wiring harness to the seat cushion pan, and connect the 2 cushion heater mat electrical connectors.
  
  Fig 4: Identifying Occupant Classification System Module Electrical Connector
  Courtesy of FORD MOTOR CO.
Install the front passenger seat and repower the SRS . For additional information, refer to SEATING . Do not prove out the SRS within the seat installation procedure. Proceed to the next step after seat installation and repowering the SRS to carry out the system reset procedure.

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 carrying out the System Reset. Failure to follow these instructions may result in incorrect operation of the occupant classification sensor (OCS) system and increases the risk of serious personal injury or death in a crash.

NOTE: To prevent system failure, the following precautions must be taken before carrying out the Occupant Classification Sensor (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 process.

Carry out the Occupant Classification Sensor (OCS) system reset.
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

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 SENSOR - SERVICE KIT .
Prove out the SRS as follows:
Turn the ignition from ON to OFF. Wait 10 seconds, then turn the ignition back ON and 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 5 Hz rate (RCM not configured).
The air bag warning indicator might not light until approximately 30 seconds after the ignition 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 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.