What Does B00C1 Mean?
This code indicates a malfunction in the passenger seat occupant classification sensor circuit B, which is part of the supplemental restraint system (SRS/airbag system). The body control module or airbag control module has detected an abnormal signal or subfault condition from one of the multiple sensors in the passenger seat mat that determines occupant weight and position. This sensor data is critical for proper airbag deployment decisions, including whether to suppress or deploy the passenger airbag based on occupant size and weight.
Common Causes
45%
Faulty occupant classification sensor mat or pressure sensor within the passenger seat cushion
30%
Damaged, corroded, or loose wiring harness connector under the passenger seat
15%
Water damage or contamination to the seat sensor mat from spills or moisture intrusion
10%
Failed airbag control module or body control module processing error
Diagnostic Steps
1
Step 1: Perform a visual inspection of the passenger seat area, checking for any objects, items, or modifications under the seat cushion that could affect sensor readings. Remove seat covers or aftermarket accessories if present.
2
Step 2: Using a multimeter, check the occupant classification sensor connector under the passenger seat for proper voltage supply (typically 5V reference) and ground integrity. Verify connector pins are not corroded, bent, or damaged.
3
Step 3: With seat unoccupied, monitor live data from the occupant classification sensor using the scan tool to observe resistance or voltage values. Compare readings to manufacturer specifications (typically 0-5V range based on weight detection).
4
Step 4: Place calibrated weights (following manufacturer test procedure, typically 10 lbs, 35 lbs, 80 lbs, and 120 lbs) on the passenger seat and observe sensor response through live data to verify proper weight classification thresholds.
5
Step 5: Inspect the seat cushion for signs of water damage, staining, or physical damage. Check seat mounting bolts for proper torque as loose mounting can affect sensor calibration.
6
Step 6: If all wiring and sensor readings are within specification, perform sensor recalibration procedure using manufacturer-specific scan tool functions. If recalibration fails or sensor readings remain out of range, replace the occupant classification sensor mat.
Estimated Repair Cost
$200 - $1,200
Parts + labor, varies by vehicle and location
This code indicates a malfunction in the passenger seat occupant classification sensor circuit B, which is part of the supplemental restraint system (SRS/airbag system). The body control module or airbag control module has detected an abnormal signal or subfault condition from one of the multiple se...
The most common cause of B00C1 (Passenger Seat Occupant Classification Sensor "B" (Subfault)) is: Faulty occupant classification sensor mat or pressure sensor within the passenger seat cushion
Typical repair costs for B00C1 range from $200 to $1,200, depending on the vehicle, location, and whether you do it yourself or go to a shop.
The vehicle is safe to drive, but the passenger airbag system may not function properly in a collision, potentially deploying when it shouldn't or failing to deploy when needed. The airbag warning light will remain illuminated, and the system should be repaired promptly to ensure proper occupant protection.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to B00C1 to identify the root cause.
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Quick Info
Category
Body
System
Supplemental Restraint System (SRS/Airbag)
Difficulty
Type
Generic (SAE)
Recommended Tools
OBD2 Scanner
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