The Nissan B00a0 diagnostic trouble code (DTC) indicates an issue with the Occupant Classification System, specifically an abnormal voltage reading from the Occupant Sensor Unit. This often triggers the airbag warning light. While dealerships might recommend a costly seat base replacement, this guide provides a more affordable DIY solution using compatible Nissan Pathfinder sensors to address the B00A0 error code.
This problem was initially diagnosed at a local dealership, with the recommended solution being a full seat base replacement. This is a costly and time-intensive repair. The dealership claimed the occupant detection sensors were not available as separate components. However, further research revealed that the Nissan Pathfinder sensor (part number 98853-3JA0A) is identical to the one used in Infiniti Q60 vehicles and available at a significantly lower cost.
Replacing the Faulty Sensor: A Step-by-Step Guide
This repair involves removing the passenger seat to access the occupant classification sensor. Two new sensors (98853-3JA0A), red Loctite (threadlocker), a ratchet with 12mm and 14mm short sockets, and a diagnostic tool capable of performing a Zero Point Reset and clearing fault codes are required.
Passenger Seat Removal
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Prepare the Seat: Remove the headrest for easier maneuvering and raise the seat to its highest position to facilitate sensor access.
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Remove Bolt Covers: Locate and remove the covers concealing the four seat mounting bolts. These covers can be pulled away from the seat.
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Detach the Seat: Carefully tilt the seat back, ensuring cables and clips aren’t damaged. Disengage the cable clips by squeezing their ends from the back. Disconnect the wiring harness connectors.
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Remove the Seat: Gently fold and remove the seat from the vehicle.
Sensor Replacement
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Access the Sensor: A plastic cover panel needs to be removed to access one of the sensor bolts. This panel is located on the underside of the seat base (refer to the image below for its location).
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Loosen the Bolts: Loosen all sensor bolts using a 12mm socket for the side bolts (be cautious as they can strip) and a 14mm socket for the center bolt.
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Replace the Sensors: Remove the old sensors and install the new ones. Apply red Loctite to the center bolt threads of the new sensors during installation. See the provided link for a visual guide on bolt locations.
- Reinstall the Seat: Reverse the removal procedure to reinstall the seat.
Final Steps
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Zero Point Reset: Perform a Zero Point Reset using a compatible diagnostic tool (e.g., Maxicom MK808) by navigating to Control Module > Occupant Detection > Special Functions > Zero Point Reset.
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Clear Fault Codes: Clear any remaining airbag fault codes using the diagnostic tool. After completing these steps, the B00A0 error and the airbag warning light should be resolved. This DIY solution provides a significant cost saving compared to the dealership’s recommendation.
