Seat Occupant Sensor: Service and Repair

Occupant Classification Sensor (OCS) System Reset

System Reset - Bladder OCS

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, it is necessary to carry out the OCS reset when a front passenger seat cushion is disassembled, a new cover installed or an OCS service kit is installed. A scan tool is used to carry out the OCS reset.
- To prevent system failure, the following precautions must be taken before carrying out the OCS reset:
- Make sure the voltage to the OCSM is above 8 volts and less than 18 volts.
- Make sure the OCS is not at a temperature below 6 °C (42 °F) or above 36 °C (97 °F) when initiating the OCS reset. If the vehicle has been exposed to extreme cold or hot temperatures, the vehicle must be exposed to 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 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 ON before carrying out the OCS reset.

NOTE: The SRS must be fully operational and free of faults before releasing the vehicle to the customer.

1. Make sure no OCSM DTCs are present. If DTC U3000:54 is the only OCSM present, it will clear upon completion of a successful system reset. All other OCSM DTCs must be diagnosed and repaired before carrying out the OCS reset.
2. Carry out the OCS reset.
3. If the first system reset attempt was unsuccessful, carry out a thorough inspection of the following and repair any concerns found.
- Check the OCS connector and wiring for damage.
- Inspect the pressure sensor hose for kinks and/or damage.
- Verify correct pressure sensor hose routing - refer to Occupant Classification Sensor.
- Inspect seat-related wiring harness and body wiring harness terminals and connectors for damage.

4. Carry out a second OCS reset. If unsuccessful, install a new OCS service kit. Refer to Occupant Classification Sensor.
5. Prove out the SRS as follows:
With the ignition OFF, wait 10 seconds, then turn the ignition ON and monitor the air bag warning indicator with the air bag modules installed. The air bag warning indicator illuminates continuously for approximately 6 seconds and then turns off. If a SRS fault is present, the air bag warning indicator will:
- fail to light.
- remain lit continuously.
- flash.

The flashing might not occur until approximately 30 seconds after the ignition has been turned from OFF to ON. This is the time required to complete testing of the SRS. If the air bag 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 air bag warning indicator and any SRS faults.

6. Clear all RCM and OCSM CMDTCs.

System Reset - Weight Sensor Bolt OCS

WARNING: The following precautions must be taken before carrying out the following procedure on the front passenger seat:
- Park the vehicle on level ground.
- Make sure the occupant classification system (OCS) is stabilized at a temperature in the range of 5 °C to 48 °C (41 °F to 118 °F) and is not exposed to temperatures outside that range.
- Make sure the front passenger seat is empty and dry.
- Make sure the front passenger seat repair is complete and all attached components (head restraint, seat side shield) are correctly installed.
- Make sure nothing is placed in the map pockets (if equipped) of the front passenger seat.
- Make sure nothing is underneath the front passenger seat.
- Make sure no non-factory installed items (seat covers, DVD screens) are on or contacting the front passenger seat. If any non-factory items were installed to the seat, remove the item(s) and communicate to the customer that any alteration/modification to the front passenger seat may affect performance of the OCS. Refer to the Owner's Literature.
- Make sure the seat is correctly installed in the vehicle.

Failure to follow these instructions may result in incorrect operation of the OCS and increases the risk of serious personal injury or death in a crash.

NOTE: After installation of new OCS component(s) and the completion of Inspection and Repair After a Supplemental Restraint System (SRS) Deployment, the OCSM will have DTC B1193:00 stored in memory. In the event of a crash, DTC B1193:00 must be cleared before carrying out the OCS Reset.

1. If a SRS deployment has occurred, carry out the following steps:
- Verify that all steps have been carried out as outlined in the Inspection and Repair After a Supplemental Restraint System (SRS) Deployment procedure.

- NOTE: If RCM DTC B1193:00 is present, a new RCM must be installed before clearing OCSM DTC B1193:00. If a new RCM is not installed first, the OCSM DTC B1193:00 will not clear.

Clear OCSM DTC B1193:00.

- Proceed to Step 4 to carry out the System Reset.

2. If SRS deployment has NOT occurred, if the front passenger seat has been removed and/or serviced or new OCS components have been installed, proceed to Step 3 to carry out the System Reset.

NOTE: After installation of new OCS component(s), (seat track assembly or OCSM), the OCSM will have DTC U3000:54 stored in memory. This DTC will clear after a successful System Reset.

3. Carry out the RCM self-test. If DTC B00A0:09 or B00A0:68 is retrieved on-demand, retrieve OCSM DTCs.
- If OCSM DTCs are retrieved on-demand and NO new components have been installed, refer to the OCSM DTC Chart for diagnostic direction.
- If no OCSM DTCs are retrieved on-demand, CLEAR the DTC from the RCM and proceed to step 4 to carry out the System Reset.

4. Turn the ignition to the OFF position.
5. Prepare the passenger seat for a System Reset and make sure:
- the OCS weight sensor bolt harness connections are correct for each sensor at the correct locations. Refer to Wiring Diagrams cell 46 for schematic and connector information. Refer to the illustration for correct sensor location on the seat.
- the seat wiring harnesses are routed and secured correctly and are not twisted, pinched, pulling down or pushing up on any seat component. Refer to Seat Wire Harness Routing.
- all seat fasteners have been tightened to specification as identified.
- the seat track is correctly aligned (manual seat track) - check the seat track fastener hole alignment, lift the seat adjust bar to align the holes in the track bracket to the holes in the floor.
- the seat is correctly installed in the vehicle.
- the passenger safety belt buckle is unbuckled.
- the front passenger seat is empty and there is nothing underneath the seat. Remove any items that are not factory installed components.
- the seat backrest is in an upright (vertical) position.
- the seat is at the mid-point of seat track travel.
- the seat height is in the middle position (power seat only).
- the hysteresis has been removed from the front passenger seat by firmly hitting the seat backrest 3 times.
- the vehicle electrical system voltage is below 18 volts and above 11.5 volts before continuing with the OCS Reset.







6. Turn the ignition ON, wait 8 seconds.
7. Carry out the OCSM System Reset.
- If the System Reset was successful, carry out the OCS Zero Seat Weight Test. Refer to Occupant Classification Sensor (OCS) System Zero Seat Weight Test.
- If the System Reset was unsuccessful, proceed to step 8.

8. NOTE: Do not install any new OCS components at this time. OCS components should only be installed when directed to do so.

Retrieve OCSM DTCs.
- If DTC B00A0:54 is retrieved on-demand, refer to the OCSM DTC Chart for diagnostic direction for this DTC.
- If any other DTCs are retrieved on-demand from the OCSM, proceed to Step 9.

9. Inspect all the items listed in Step 5 for causes of a unsuccessful system reset and repair as necessary. Carry out the System Reset again.
10. If the System Reset was successful, carry out the Occupant Classification Sensor (OCS) System Zero Seat Weight Test.
If the System Reset was unsuccessful, install a new passenger seat track assembly.