2021-2022 Nissan Sentra B00A0-00 DTC Stored TSB

Nissan Technical Service Bulletin (TSB) NTB19-071B addresses a common diagnostic trouble code (DTC) B00A0-00, which relates to the Occupant Detection Sensor Unit. This TSB provides a detailed procedure for technicians to diagnose and resolve this issue, particularly when an Occupant Classification System (OCS) zero point reset cannot be performed.

Symptoms

Owners of affected Nissan vehicles, including the 2021-2022 Nissan Sentra, may experience the following symptoms related to DTC B00A0-00:

• The diagnostic trouble code B00A0-00 (OCCUPANT DETECTION SENSOR UNIT) is stored in the vehicle's system.
• An OCS zero point reset procedure cannot be successfully completed.
• During diagnostic attempts, the CONSULT PC may display messages such as "Operation has been stopped due to following reasons. 1. Vehicle condition is out of test condition. 2. No response from Vehicle ECU."

Fault Codes / DTCs

This bulletin specifically addresses:

• B00A0-00: OCCUPANT DETECTION SENSOR UNIT

Technicians will also look for a specific internal code, "75h," under the CURRENT FAILURE CODE display when using the ODS Analysis Tool to confirm the applicability of this bulletin.

Diagnosis / Trigger Conditions

Diagnosis for this issue primarily involves confirming the presence of DTC B00A0-00. The inability to perform an OCS zero point reset is a key indicator. Technicians use the Nissan CONSULT PC and ODS Analysis Tool software to check for the DTC and attempt the reset procedure. For specific models like the Titan XD, the bulletin applies only if the vehicle is equipped with an OCS, identifiable by the presence of a front passenger air bag status light.

Important Warnings and Notices

Nissan outlines several critical precautions for technicians to prevent damage to the OCS control unit and ensure a successful repair:

• Battery Voltage: "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."
• Electrical Loads: "Be sure to turn OFF all vehicle electrical loads. If a vehicle electrical load remains ON, the OCS control unit may be damaged."
• CONSULT PC Power: "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."
• Bluetooth Interference: "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."
• Other DTCs: "If any air bag related DTCs other than B00A0-00 are stored, perform diagnosis and repairs as needed." This bulletin is specifically for the Nissan Sentra B00A0-00 fault.
• CONSULT PC Placement: "Do not set the CONSULT PC on the vehicle."
• Vehicle Movement: "Do not touch the vehicle during OCS Reprogramming" and "Minimize vehicle vibrations."
• Bulletin Applicability: "If code 75h does NOT show under CURRENT FAILURE CODE, STOP HERE. This bulletin does not apply. Refer to ASIST and the ESM for further diagnostic assistance."

Required Tools or Parts

To perform the repair described in this TSB, Nissan dealers will utilize specific equipment:

• OCS Reprogramming Cable J-51594: This is an essential special tool for the reprogramming process.
• CONSULT PC: A Nissan diagnostic computer.
• CONSULT-III plus (C-III plus) software: The diagnostic software used with the CONSULT PC.
• ASIST: Nissan's Automotive Service Information Support Terminal.
• Battery maintainer/smart charger: To maintain stable voltage during reprogramming.
• AC Adapter: For the CONSULT PC.
• Occupant Sensor (98856-***):** While the procedure focuses on reprogramming, this part number is referenced for claims information if a sensor replacement is deemed necessary.

Repair Procedure Summary

Addressing the Nissan Sentra B00A0-00 DTC involves a multi-step process for qualified technicians:

1. Preparation and Software Update: Ensure the CONSULT PC's ASIST and CONSULT-III plus software are fully updated and synchronized. Confirm the PC is connected to the internet. For LEAF vehicles, turn off charging and climate control timers. For Titan XD, verify the presence of the front passenger airbag status light, indicating OCS equipment.
2. Vehicle Connection and Initial DTC Check: Turn on the ignition (engine off/not ready) and hazard lights. Connect the Vehicle Interface (VI) to the vehicle's DLC connector and the CONSULT PC. Start CONSULT-III plus and ASIST to check for any airbag-related DTCs. Any DTCs other than B00A0-00 must be diagnosed and repaired first.
3. OCS Analysis Tool Setup: Close CONSULT-III plus but keep ASIST running. Connect the OCS Reprogramming Cable J-51594 between the vehicle's DLC connector and the CONSULT PC's USB port.
4. Vehicle Environment Preparation: Park the vehicle on a level surface. Ensure the front passenger seat is empty and no occupants are in the vehicle. Place the CONSULT PC outside the vehicle on a stable surface, avoiding contact with the vehicle. Minimize any vehicle vibrations.
5. Perform OCS Zero Reset: On the ASIST menu, navigate to