Code
B2810
HUMMER
B — Body
Occupant Classification System Fault
AI status
Completed
Completed
100%
Causes
- Damaged or shorted occupant classification mat (seat pad) sensors
- Corroded, loose, or disconnected wiring or connectors under the passenger seat
- Water/moisture intrusion into the seat mat or connector
- Faulty occupant classification (classifier) module
- Blown fuse or poor power/ground to the OCS module
- Loss of communication between the OCS module and vehicle network (CAN/LIN)
Symptoms
- Airbag warning lamp illuminated or SRS/airbag system message displayed
- Passenger airbag status incorrect (disabled when occupied or enabled when empty)
- Unable to complete OCS calibration or repeated calibration failures
- Diagnostic trouble code B2810 stored in SRS/BCM memory
- Possible limited vehicle functionality tied to airbag system safety logic
What to check
- Read and record all stored codes, freeze frame and event data with a capable scan tool
- Visually inspect passenger seat, underside, connectors and wiring harness for damage or moisture
- Check related fuses and power/ground at the OCS/module connector
- Confirm presence of classifier data on the vehicle communication bus with a scan tool
- Check for recent seat repairs, replacement, or aftermarket covers that could affect the mat
- Follow manufacturer SRS safety procedures before performing any resistance/continuity tests
Signal parameters
- Sensor mat zones produce analog signals (typically 0–5 V range) or variable resistance proportional to load — compare to service specifications
- Reference supply and ground present at the OCS module (battery voltage and chassis ground)
- Classifier module communicates occupant classification result on vehicle data bus (CAN or LIN) — valid messages expected when system healthy
- Scan tool should show live OCS status values (zone weights or classification states) when probed
Diagnostic algorithm
- With a scan tool, record B2810 plus any related codes and freeze-frame data. Note whether other SRS or communication codes are present.
- Inspect passenger seat, mat, wiring and connectors for physical damage, moisture, loose pins or corrosion. Repair any visible wiring issues.
- Verify power and ground at the OCS/module connector and check related fuses. Repair poor power/ground as needed.
- Using a diagnostic tool, check for live OCS data on the bus. If communication is lost, trace and repair bus wiring/connectors and related modules.
- With manufacturer guidance and SRS safety procedures, measure mat sensor outputs (resistance or analog voltage) on individual zones and compare to service manual or a known-good reference.
- If mat sensor values are out of specification or inconsistent, replace the occupant classification mat and retest.
- If mat tests good and wiring/power are good but fault persists, test or replace the occupant classification (classifier) module per manufacturer procedures. Programming/configuration may be required after replacement.
- After repairs, clear codes, perform required OCS calibration/learn procedure using the manufacturer scan tool, and verify the airbag lamp remains off and the system reports valid occupant classification.
Likely causes
- Moisture or damage to the seat sensor mat or connector
- Connector pin corrosion or poor ground at the seat/module
- Faulty or failing occupant classification module
- Communication fault on the vehicle bus preventing valid classifier data
- Incorrect seat reassembly or aftermarket seat cover interfering with sensors
Fault status
Status
Occupant Classification System Fault — invalid or missing occupant classification data; check mat, wiring, power/ground, and classifier module.
Repair difficulty: Medium
Diagnostic time: 1-3 hours
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Repair manuals
Manual library for HUMMER
138
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