The B00A0-00 diagnostic trouble code (DTC) in Nissan vehicles indicates an issue with the Occupant Classification Sensor Unit, often triggering the airbag warning light. This commonly necessitates replacement of the sensor. While dealerships might recommend replacing the entire seat base, a more cost-effective solution involves replacing the sensor itself. This guide outlines the process for a 2018 Infiniti Q60, utilizing the compatible Nissan Pathfinder sensor (part number 98853-3JA0A).
This specific case involved a 2018 Q60 Luxe with 95,000 KM experiencing a B00A0-00 fault code and an illuminated airbag light. The dealership proposed replacing the entire seat base, a costly and labor-intensive procedure. However, research revealed that the Nissan Pathfinder’s occupant sensor is identical, offering a significantly cheaper alternative.
Passenger Seat Removal for Sensor Access
Before replacing the sensor, the passenger seat must be removed. First, raise the seat to its highest position. This crucial step simplifies sensor removal later. Next, locate and remove the plastic covers concealing the four seat mounting bolts. A gentle pull should suffice.
Unbolt the 14mm seat mounting bolts. Carefully tilt the seat back, avoiding damage to cables and connectors. Disconnect the wiring harness by squeezing the clips on the connectors. Finally, remove the seat from the vehicle. With the seat removed, access the occupant classification sensor. A plastic cover panel needs to be removed to access one of the sensor bolts.
Occupant Classification Sensor Replacement
With the seat out, locate the occupant classification sensor. You’ll need to remove a small plastic cover to access one of the sensor’s bolts. Loosen all sensor bolts (12mm for side bolts, 14mm for the center bolt) before attempting to remove the sensor. The bolts can be quite tight, so use caution, especially with the smaller 12mm bolts, as their heads can be prone to stripping. Install the new sensor, using red Loctite on the center bolt.
Reinstall the seat by reversing the removal procedure. Ensure all connections are secure.
Post-Installation Procedures and Resolution
After reinstalling the seat, a Zero Point Reset is required to calibrate the new sensor. This can be performed using a compatible diagnostic tool, such as a MaxiCOM MK808, by navigating to Control Module > Occupant Detection > Special Functions > Zero Point Reset. Clear any remaining airbag fault codes using the diagnostic tool. In this instance, following these steps successfully resolved the B00A0-00 issue and extinguished the airbag warning light. Replacing the sensor directly addressed the root cause, avoiding the unnecessary expense of a complete seat base replacement.
