2021-2023 Nissan Vehicles DTC B00A0-00 OCS Fault

Symptoms

Owners of affected 2021-2023 Nissan vehicles may experience the following:

• The diagnostic trouble code "DTC B00A0-00 (OCCUPANT DETECTION SENSOR UNIT)" is stored in the vehicle's system.
• An "OCS zero point reset cannot be performed" when attempting diagnostic procedures.
• The CONSULT diagnostic tool displays a message stating: "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

This bulletin specifically addresses the following diagnostic trouble code:

Code	Description	Module
B00A0-00	Occupant Detection Sensor Unit (OCS)	Air Bag

Additionally, a diagnostic check for the code "75h" under CURRENT FAILURE CODE is crucial to determine if this bulletin applies.

Diagnosis / Trigger Conditions

To confirm if this technical service bulletin applies to your vehicle, a technician will verify several conditions:

• DTC B00A0-00 must be stored in the vehicle's system.
• The Occupant Classification System (OCS) zero point reset procedure must fail.
• The CONSULT diagnostic tool will show the specific "Operation has been stopped..." message.
• For Titan XD vehicles, the bulletin applies only if the vehicle is equipped with an OCS, indicated by the presence of a front passenger air bag status light.
• Any other air bag related DTCs must be diagnosed and repaired before proceeding with the OCS procedure.
• During the ODS Analysis Tool process, the code "75h" must be present under the "CURRENT FAILURE CODE" display for the bulletin to be applicable. If "75h" is not present, this bulletin does not apply, and further diagnosis is required.

Repair Procedure Summary

The repair for the Nissan B00A0-00 fault involves a specific reprogramming and reset procedure for the Occupant Classification System (OCS) control unit. This must be performed by a qualified technician using specialized Nissan diagnostic equipment.

1. Preparation: Ensure the CONSULT PC is updated, synchronized with ASIST, and connected to the internet. The vehicle's battery must be maintained between 12.0V and 15.5V using a battery maintainer. All vehicle electrical loads and external Bluetooth devices must be turned off to prevent interruption or damage to the OCS control unit during reprogramming. For LEAF vehicles, charging and climate control timers must be off.
2. Initial Setup: Turn on the ignition (engine off/not Ready) and hazard warning lamps. Connect the Vehicle Interface (VI) to the vehicle. Start CONSULT-III plus and ASIST, checking for and resolving any other air bag DTCs besides B00A0-00.
3. Tool Connection: Close CONSULT-III plus (leaving ASIST running) and connect the OCS Reprogramming Cable (J-51594) between the vehicle's DLC connector and the CONSULT PC's USB port.
4. Vehicle Environment: The vehicle must be parked on a level surface with the front passenger seat empty. No occupants should be in the vehicle, and the CONSULT PC should be placed outside the vehicle. Technicians must avoid touching the vehicle and minimize vibrations during the reprogramming process.
5. OCS Analysis Tool: Access the ODS Analysis Tool via ASIST's Specialty Tools menu. Input the vehicle model and the last eight characters of the VIN, then select "CHECK".
6. Verify Code: Confirm that the code "75h" is displayed under "CURRENT FAILURE CODE". If this code is not present, the bulletin does not apply.
7. 75-Zero RESET: Select "75-Zero RESET" and confirm. The process will run for approximately 7 seconds. The technician will be prompted to turn the ignition OFF, then ON again, and then select "OK".
8. Verification: After the reset, verify that the "75h" code is no longer displayed under "CURRENT FAILURE CODE".
9. DTC Clearance: Disconnect the J-51594 tool, reconnect the VI, and select "Diagnosis (All Systems)" in CONSULT. Confirm vehicle information, then navigate to "AIR BAG" and ensure B00A0-00 is the only DTC present. Select "ERASE" and "Execute" to clear the DTCs.
10. Final Steps: After confirming DTCs are erased, turn off the ignition, disconnect the battery maintainer, turn off hazard lamps, close CONSULT-III plus, and disconnect the VI. For LEAF vehicles, re-enable charging and climate control timers if applicable.

Required Tools or Parts

Performing this repair requires specific tools and components:

• OCS Reprogramming Cable (USB Cable, VAG): Part number J-51594 (new part number CO-J-51594). This essential tool is typically pre-sent to dealers.
• Nissan CONSULT PC: Equipped with ASIST and CONSULT-III plus (C-III plus) software, fully updated and synchronized.
• Vehicle Interface (VI): To connect the CONSULT PC to the vehicle.
• Battery Maintainer/Smart Charger: Capable of maintaining vehicle battery voltage between 12.0V and 15.5V during the reprogramming process.
• Occupant Sensor (98856-*****): This is referenced as the Primary Failed Part (PFP) for warranty claims.

Important Warnings

Nissan emphasizes several critical warnings for technicians performing this procedure to ensure safety and prevent damage:

• "Connect a battery maintainer or smart charger set to reflash mode or a similar setting. If the vehicle's battery voltage drops below 12.0V or rises above 15.5V during reprogramming, the OCS control unit may be damaged."
• "Be sure to turn OFF all vehicle electrical loads. If a vehicle electrical load remains ON, the OCS control unit may be damaged."
• "Be sure to connect the AC Adapter to the CONSULT PC. If the CONSULT PC battery voltage drops during reprogramming, the process will be interrupted and the OCS control unit may be damaged."
• "Turn OFF all external Bluetooth® devices (e.g., cell phones, printers, etc.) within range of the CONSULT PC and tool J-51594. 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."
• "Do not set the CONSULT PC on the vehicle."
• "Do not touch the vehicle during OCS Reprogramming."
• "Minimize vehicle vibrations."
• "Nissan Bulletins are intended for use by qualified technicians, not 'do-it-yourselfers'. Qualified technicians are properly trained individuals who have the equipment, tools, safety instruction, and know-how to do a job properly and safely. NOTE: If you believe that a described condition may apply to a particular vehicle, DO NOT assume that it does. See your Nissan dealer to determine if this applies to your vehicle."

Owner Action

If your 2021-2023 Nissan vehicle is displaying an air bag warning light, or if you suspect an Occupant Detection Sensor Unit (OCS) fault, particularly if you are experiencing symptoms related to a Nissan B00A0-00 fault, it is crucial to contact your authorized Nissan dealer. This repair requires specialized diagnostic tools and software, and should only be performed by qualified technicians to ensure proper function of the safety system.

Amendment History

This bulletin has undergone several revisions:

• September 12, 2019: NTB19-071 (Original bulletin published)
• March 5, 2021: NTB19-071A (APPLIED VEHICLES revised)
• April 26, 2022: NTB19-071B (APPLIED VEHICLES revised)
• March 9, 2023: NTB19-071C (APPLIED VEHICLES and pages 3, 5, and 10 revised)

NHTSA ID: 10234044