Seat Occupant Classification Module - Air Bag: Service and Repair
Occupant Classification Sensor (OCS) System Reset
System Reset - Bladder System
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 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 Occupant Classification Sensor (OCS) system reset when a front passenger seat cushion is disassembled, a new cover installed or an OCS (Occupant Classification Sensor) system service kit is installed. A scan tool is used to carry out the OCS (Occupant Classification Sensor) system reset.
NOTICE: 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 (Occupant Classification Sensor) system is not at a temperature below 6°C (42°F) or above 36°C (97°F) when initiating the OCS (Occupant Classification Sensor) system reset. 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 (Occupant Classification Sensor) 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 ON before carrying out the OCS (Occupant Classification Sensor) system reset.
NOTE: An Occupant Classification Sensor (OCS) system service kit has the electrical connector glued to the Occupant Classification System Module (OCSM). It cannot and should not be disconnected or altered.
NOTE: The Supplemental Restraint System (SRS) must be fully operational and free of faults before releasing the vehicle to the customer.
1. Make sure no OCSM (Occupant Classification System Module) DTCs are present. If DTC C1941 is the only OCSM (Occupant Classification System Module) present, it will clear upon a successful system reset. All other OCSM (Occupant Classification System Module) DTCs must be diagnosed and repaired before carrying out the OCS (Occupant Classification Sensor) system reset.
2. Carry out the OCS (Occupant Classification Sensor) system reset.
3. If the first system reset attempt was unsuccessful, carry out a thorough inspection of the following and repair any concerns found.
- OCS (Occupant Classification Sensor) 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
4. Carry out a second OCS (Occupant Classification Sensor) system reset. If unsuccessful, install a new OCS (Occupant Classification Sensor) system service kit. For additional information, refer to Occupant Classification Sensor .
5. Prove out the SRS (Supplemental Restraint System) as follows:
Turn the ignition from ON to 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 will light continuously for approximately 6 seconds and then turn off. If an air bag SRS (Supplemental Restraint System) fault is detected, 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 the OFF to the ON position. This is the time required to complete testing of the SRS (Supplemental Restraint System). If the air bag warning indicator is inoperative and a SRS (Supplemental Restraint System) 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 (Supplemental Restraint System) fault discovered must be diagnosed and repaired.
Clear all RCM (Restraints Control Module) and OCSM (Occupant Classification System Module) CMDTCs (Continuous Memory Diagnostic Trouble Codes).
System Reset - Weight Sensor Bolt System
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 (Occupant Classification Sensor) system component(s) and the completion of Inspection and Repair After a Supplemental Restraint System (SRS) Deployment , the OCSM (Occupant Classification System Module) will have DTC B1193:00 stored in memory. In the event of a crash, DTC B1193:00 must be cleared before carrying out the Occupant Classification Sensor (OCS) System Reset.
1. If a SRS (Supplemental Restraint System) 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: A new RCM (Restraints Control Module) must be installed before clearing OCSM (Occupant Classification System Module) DTC B1193:00, if a new RCM (Restraints Control Module) is not installed first, the OCSM (Occupant Classification System Module) DTC B1193:00 will not clear.
Clear OCSM (Occupant Classification System Module) DTC B1193:00.
- Proceed to Step 4 to carry out the System Reset.
2. If SRS (Supplemental Restraint System) deployment hasNOT occurred, if the front passenger seat has been removed and/or serviced or new OCS (Occupant Classification Sensor) components have been installed,proceed to Step 3 to carry out the System Reset.
NOTE: After installation of new OCS (Occupant Classification Sensor) system component(s), (seat track assembly or OCSM (Occupant Classification System Module)), the OCSM (Occupant Classification System Module) will have DTC B00A0:54 stored in memory. This DTC will clear after a successful System Reset.
3. Carry out the RCM (Restraints Control Module) self-test. If DTC B00A0:09 is retrieved on-demand, retrieve OCSM (Occupant Classification System Module) DTCs.
- If OCSM (Occupant Classification System Module) DTCs are retrieved on-demand andNO new components have been installed, refer to the Occupant Classification System Module (OCSM) DTC Chart for diagnostic direction. Seats
- If no OCSM (Occupant Classification System Module) DTCs are retrieved on-demand, CLEAR the DTC from the RCM (Restraints Control Module) andproceed 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 (Occupant Classification Sensor) weight sensor bolt harness connections are correct for each sensor at the correct locations. Refer to Wiring Diagram Set 46 for schematic and connector information. Refer to the illustration for correct sensor location on the seat. Diagrams By Number
- 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 in Seats.
- all seat fasteners have been tightened to specification as identified in the diagnostic/repair information.
- the seat track is correctly aligned (manual seat track).
- 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 were not factory components installed and make sure that the seat is correctly installed in the vehicle
- the seat backrest is in a normal seating (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 isbelow 18 volts and above 11.5 volts before continuing with the OCS (Occupant Classification Sensor) System Reset.
6. Turn the ignition ON, wait 8 seconds.
7. Carry out the OCSM (Occupant Classification System Module) System Reset.
- If the System Reset was successful, carry out the OCS (Occupant Classification Sensor) Zero Seat Weight Test. For additional information, 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 (Occupant Classification Sensor) system components at this time. OCS (Occupant Classification Sensor) system components should only be installed when directed to do so.
Retrieve OCSM (Occupant Classification System Module) DTCs.
- If DTC B00A0:54 is retrieved on-demand, refer to the DTC Charts for diagnostic direction of this DTC. Seats
- If any other DTCs are retrieved on-demand from the OCSM (Occupant Classification System Module),proceed to Step 9.
9. Inspect all the items listed inStep 5 for causes of a unsuccessful System Reset, repair as necessary. Retest the system.
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, refer to Seats.