What Does B00B3 Mean?
This code indicates a fault in the driver seat occupant classification sensor subsystem, specifically sensor 'D' or a subfault within the occupant detection system. The Body Control Module (BCM) or Restraint Control Module (RCM) has detected an abnormal signal, calibration issue, or internal fault in one of multiple sensors used to classify seat occupancy for airbag deployment control. This system uses pressure sensors, strain gauges, or weight sensors in the seat cushion to determine if the seat is occupied and classify occupant size/weight.
Common Causes
45%
Faulty occupant classification sensor mat or pressure sensor in seat cushion
30%
Damaged or corroded wiring harness connector under driver seat
15%
Water intrusion or contamination in seat sensor mat causing incorrect readings
10%
Failed restraint control module or BCM with faulty sensor interface circuit
Diagnostic Steps
1
Step 1: Perform visual inspection under driver seat for damaged wiring, loose connectors, or evidence of water intrusion. Check connector terminals for corrosion, bent pins, or moisture.
2
Step 2: Using a multimeter, test voltage supply and ground circuits to the occupant classification sensor at the connector (typically 5V reference and ground). Compare readings to manufacturer specifications.
3
Step 3: Monitor live data from the occupant classification sensor using scan tool to observe voltage/resistance values with seat empty, then with known weights (50 lbs, 100 lbs, 150+ lbs) placed on seat. Verify sensor responds appropriately to weight changes.
4
Step 4: Check for Technical Service Bulletins (TSBs) related to occupant classification system calibration or sensor mat replacement procedures for the specific vehicle.
5
Step 5: If sensor readings are erratic or out of range, disconnect sensor and measure resistance across sensor terminals. Compare to specifications (typically 1-10 kOhms depending on design).
6
Step 6: Replace faulty sensor mat or repair wiring as identified, then perform occupant classification system calibration/reset procedure and verify code does not return after test drive.
Estimated Repair Cost
$250 - $1,200
Parts + labor, varies by vehicle and location
This code indicates a fault in the driver seat occupant classification sensor subsystem, specifically sensor 'D' or a subfault within the occupant detection system. The Body Control Module (BCM) or Restraint Control Module (RCM) has detected an abnormal signal, calibration issue, or internal fault i...
The most common cause of B00B3 (Driver Seat Occupant Classification Sensor "D" (Subfault)) is: Faulty occupant classification sensor mat or pressure sensor in seat cushion
Typical repair costs for B00B3 range from $250 to $1,200, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Vehicle is drivable but the airbag system may not deploy correctly or may be disabled for the driver seat position, which is a significant safety risk. The airbag warning light will likely be illuminated. Repair should be completed promptly to ensure proper airbag function in the event of a collision.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to B00B3 to identify the root cause.
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Quick Info
Category
Body
System
Supplemental Restraint System (Airbag/Occupant Detection)
Difficulty
Type
Generic (SAE)
Recommended Tools
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