What Does B00B1 Mean?
This code indicates that the Body Control Module (BCM) or Airbag Control Module has detected a malfunction in the driver seat occupant classification sensor circuit 'B', which is part of the Occupant Classification System (OCS). This system determines seat occupancy and passenger weight to control airbag deployment strategy. A subfault typically indicates an internal sensor issue, calibration error, or circuit problem within the secondary sensing element of the dual-sensor system.
Common Causes
45%
Faulty occupant classification sensor mat or pressure sensor in driver seat cushion
30%
Damaged or corroded wiring harness or connector between seat sensor and control module
15%
Sensor calibration lost or system requires recalibration after seat service or battery disconnect
10%
Faulty airbag control module or BCM with corrupted OCS data
Diagnostic Steps
1
Step 1: Check for live data from the occupant classification system using enhanced diagnostics - verify sensor voltage readings (typically 0.5-4.5V range) and status while seat is unoccupied, then occupied with known weight
2
Step 2: Perform visual inspection of driver seat sensor wiring harness under seat, checking for pinched wires, damaged insulation, or corroded connectors at sensor and module connections
3
Step 3: Disconnect seat occupant sensor connector and measure resistance across sensor terminals (typical range 200-2000 ohms depending on manufacturer) and check for short to ground or open circuit conditions
4
Step 4: If wiring and sensor resistance are within spec, perform occupant classification system calibration procedure using manufacturer-specific scan tool function with seat empty and with calibrated weights
5
Step 5: Clear codes and perform operational test with varying weights on driver seat while monitoring live sensor data to confirm proper classification changes (empty, child, small adult, large adult categories)
6
Step 6: If fault persists after calibration and sensor tests pass, replace occupant classification sensor mat and perform mandatory recalibration; if still present, suspect control module fault
Estimated Repair Cost
$200 - $800
Parts + labor, varies by vehicle and location
This code indicates that the Body Control Module (BCM) or Airbag Control Module has detected a malfunction in the driver seat occupant classification sensor circuit 'B', which is part of the Occupant Classification System (OCS). This system determines seat occupancy and passenger weight to control a...
The most common cause of B00B1 (Driver Seat Occupant Classification Sensor "B" (Subfault)) is: Faulty occupant classification sensor mat or pressure sensor in driver seat cushion
Typical repair costs for B00B1 range from $200 to $800, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Vehicle is generally safe to drive, but airbag deployment may not be optimized for driver weight/position, potentially affecting airbag performance in a collision. The airbag warning light will likely remain illuminated. Repair should be completed promptly to ensure proper airbag system function.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to B00B1 to identify the root cause.
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Quick Info
Category
Body
System
Supplemental Restraint System (SRS) / Airbag System
Difficulty
Type
Generic (SAE)
Recommended Tools
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