What Does B00C3 Mean?
This code indicates a malfunction in the passenger seat occupant classification system, specifically with sensor D or a subfault within the sensor array. The Restraint Control Module (RCM) or Body Control Module (BCM) has detected an abnormal signal from one of the multiple sensors embedded in the passenger seat that determine occupant weight and position. This system is critical for proper airbag deployment decisions, controlling whether the passenger airbag should deploy, deploy with reduced force, or remain disabled based on occupant classification.
Safety Warning
This is a critical safety system fault that may cause improper airbag deployment or failure to deploy in a collision. The passenger airbag may not function as designed, potentially causing serious injury. Repair should be performed immediately by a qualified technician, and the vehicle should not be driven with passengers until resolved.
Common Causes
45%
Faulty occupant classification sensor mat or pressure sensor element within the seat cushion
30%
Damaged, corroded, or loose wiring harness connections between seat sensor and control module
15%
Liquid damage or contamination of the seat sensor mat from spills or cleaning products
10%
Failed Restraint Control Module (RCM) or Body Control Module software corruption
Diagnostic Steps
1
Step 1: Inspect the passenger seat for any visible damage, modifications, aftermarket seat covers, or heavy objects. Remove the seat and visually inspect the sensor mat for physical damage, tears, or contamination. Check for any unusual moisture or staining on the mat surface.
2
Step 2: Using a digital multimeter, check resistance values across the occupant classification sensor connector (typically located under the seat) according to manufacturer specifications. Verify proper ground continuity and check for open or short circuits in sensor D specifically.
3
Step 3: Inspect all wiring harness connections between the seat sensor and the control module for corrosion, bent pins, or damage. Pay special attention to the connector under the seat that flexes during seat movement. Clean connections with electrical contact cleaner and verify proper terminal tension.
4
Step 4: Monitor live data stream from the occupant classification system while applying graduated weights to the passenger seat (50 lbs, 75 lbs, 100 lbs). Verify that sensor D responds appropriately and transitions through classification stages correctly. Compare readings to known-good specifications.
5
Step 5: If sensor mat and wiring test within specifications, perform a control module reset and recalibration procedure using the scan tool. Some systems require a zero-point calibration with the seat empty and all objects removed.
6
Step 6: After repairs, clear codes and perform a comprehensive test with various weight loads. Verify the airbag indicator light functions properly and the system correctly classifies occupants from child-sized to adult weights.
Estimated Repair Cost
$300 - $1,800
Parts + labor, varies by vehicle and location
This code indicates a malfunction in the passenger seat occupant classification system, specifically with sensor D or a subfault within the sensor array. The Restraint Control Module (RCM) or Body Control Module (BCM) has detected an abnormal signal from one of the multiple sensors embedded in the p...
The most common cause of B00C3 (Passenger Seat Occupant Classification Sensor "D" (Subfault)) is: Faulty occupant classification sensor mat or pressure sensor element within the seat cushion
Typical repair costs for B00C3 range from $300 to $1,800, depending on the vehicle, location, and whether you do it yourself or go to a shop.
This is a critical safety system fault that may cause improper airbag deployment or failure to deploy in a collision. The passenger airbag may not function as designed, potentially causing serious injury. Repair should be performed immediately by a qualified technician, and the vehicle should not be driven with passengers until resolved.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to B00C3 to identify the root cause.
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Quick Info
Category
Body
System
Supplemental Restraint System (SRS) / Occupant Classification System
Difficulty
Type
Generic (SAE)
Recommended Tools
OBD2 Scanner
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