2021-2024 Nissan B00A0-00 OCS Reset Failure TSB

Nissan Technical Service Bulletin (TSB) NTB19-071D, revised on September 19, 2024, addresses a specific issue affecting various 2021-2024 Nissan models. This bulletin details the diagnostic and repair process for vehicles that store Diagnostic Trouble Code (DTC) B00A0-00, indicating a problem with the Occupant Detection Sensor Unit (OCS), and are unable to complete an OCS zero point reset.

Symptoms

Owners of affected Nissan vehicles may experience the following:

• The Diagnostic Trouble Code (DTC) B00A0-00, related to the "OCCUPANT DETECTION SENSOR UNIT", is stored in the vehicle's system.
• An OCS zero point reset cannot be performed by a technician.
• During diagnostic attempts, the tool may display a message: "Operation has been stopped due to following reasons. 1. Vehicle condition is out of test condition. 2. No response from Vehicle ECU. Refer to Service Manual, confirm test condition and vehicle condition. Touch 'Retry' to try again."

Fault Codes / DTCs

The primary fault code addressed by this TSB is:

Code	Description
B00A0-00	OCCUPANT DETECTION SENSOR UNIT

Important Warnings for Technicians and Owners

Nissan emphasizes several critical precautions for this repair:

• "Nissan Bulletins are intended for use by qualified technicians, not 'do-it-yourselfers'." This procedure requires specialized training and equipment.
• During reprogramming, a battery maintainer or smart charger must be connected. "If the vehicle's battery voltage drops below 12.0V or rises above 13.5V during reprogramming, the OCS control unit may be damaged."
• All vehicle electrical loads must be turned OFF. "If a vehicle electrical load remains ON, the OCS control unit may be damaged."
• The CONSULT PC's AC Adapter must be connected. "If the CONSULT PC battery voltage drops during reprogramming, the process will be interrupted and the OCS control unit may be damaged."
• All external Bluetooth® devices (e.g., cell phones, printers) within range of the CONSULT PC and tool J-51594 must be turned OFF. "If Bluetooth® signal waves are within range of the CONSULT PC and/or tool J-51594 during reprogramming, reprogramming may be interrupted and the OCS control unit may be damaged."
• The CONSULT PC should be placed outside the vehicle on a suitable table or support. "Do not set the CONSULT PC on the vehicle."
• "Do not touch the vehicle during OCS Reprogramming."
• "Minimize vehicle vibrations" during the procedure.
• If the diagnostic tool does not show code "75h" under CURRENT FAILURE CODE during the initial check, "STOP HERE. This bulletin does not apply. Refer to ASIST and the ESM for further diagnostic assistance."

Required Tools or Parts

This repair requires specific tools and software:

• OCS Reprogramming Cable (USB Cable, VAG) - J-51594 (New part number: CO-J-51594). This essential tool is typically pre-sent to dealers.
• A CONSULT PC with synchronized ASIST and updated CONSULT-III plus (C-III plus) software, connected to the internet.

Repair Procedure Summary

The repair for the Nissan Sentra B00A0-00 and related models involves a precise sequence of steps performed by a qualified technician:

1. Preparation: Ensure the CONSULT PC has the latest ASIST and CONSULT-III plus software updates and is connected to the internet. For Nissan LEAF vehicles, confirm charging and climate control timers are off.
2. Initial Setup: Turn on the ignition (engine OFF / not Ready) and hazard warning lamps. Connect the Vehicle Interface (VI) to the vehicle.
3. DTC Check: Start CONSULT PC and ASIST to check for air bag related DTCs. If any DTCs other than B00A0-00 are present, they must be diagnosed and repaired first.
4. Tool Connection: Connect the OCS Reprogramming Cable (J-51594) between the vehicle's DLC connector and the CONSULT PC's USB connector.
5. Vehicle Environment: Prepare the vehicle by parking it on a level surface, ensuring the front passenger seat is empty, and no occupants are inside. Place the CONSULT PC outside the vehicle.
6. ODS Analysis Tool: On the CONSULT PC, navigate to ASIST's main menu, select "Specialty Tools", and then "ODS Analysis Tool".
7. Vehicle Information Entry: Enter the vehicle model and the last eight characters of the VIN, then select "CHECK". The system may prompt "Would you like to start processing 'CHECK'?" - select OK.
8. Verify Failure Code: Confirm that code "75h" is displayed under "CURRENT FAILURE CODE". If not, this bulletin does not apply.
9. Perform Zero Reset: Select "75-Zero RESET". The system will ask "Would you like to start processing '75-Zero-RESET'?" - select OK. The process runs for about 7 seconds. When prompted, turn the ignition OFF, then ON again, and select OK.
10. Verify Reset Completion: Ensure that "75h" is no longer displayed under "CURRENT FAILURE CODE".
11. Disconnect and Reconnect: Select EXIT or the 'X' to close the ODS Analysis tool. Turn OFF the ignition, then ON. Disconnect the J-51594 tool and reconnect the VI to the vehicle and CONSULT PC.
12. Clear DTC: Once the VI is recognized, select "Diagnosis (All Systems)" and then "AIR BAG". Verify B00A0-00 is the only DTC displayed. Select "ERASE" and then "Execute" to clear the DTC. The system will confirm "Erasing completed. Touch the 'Close' button, and then check sure that 'SELF-DIAG RESULTS' are deleted."
13. Final Steps: Turn OFF the ignition, disconnect the battery maintainer/smart charger, turn OFF hazard lights, and disconnect the VI. For LEAF vehicles, re-enable charging/climate control timers if applicable.

Owner Action

If your 2021-2024 Nissan vehicle is experiencing the Nissan Sentra B00A0-00 fault, or if you are unable to perform an OCS zero point reset, it is crucial to contact your authorized Nissan dealer. This repair requires specialized diagnostic tools and software that are only available to qualified technicians. Do not attempt to perform this repair yourself, as it could lead to further damage to the Occupant Detection Sensor Unit.

Amendment History

This bulletin has undergone several revisions:

• September 12, 2019: Original bulletin published (NTB19-071)
• March 5, 2021: Applied vehicles revised (NTB19-071A)
• April 26, 2022: Applied vehicles revised (NTB19-071B)
• March 9, 2023: Applied vehicles and pages 3, 5, and 10 revised (NTB19-071C)
• September 19, 2024: 2024 Model Year added to various models (L34, Y62, D41, P15, ZE1, Z52, R53, T33, B18, A61, N18); battery voltage range on page 5 revised (NTB19-071D)

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Source: NHTSA ID: 11009068