Code
B2213
Generic
B — Body
Occupant Classification System Sensor Circuit Fault
AI status
Completed
Completed
100%
Causes
- Damaged or corroded connector at the OCS sensor or seat module
- Broken or shorted wiring in the seat harness (open, short to ground, short to battery)
- Faulty occupant classification sensor pad/strain gauge or sensor module
- Faulty occupant classification / airbag module or related ECU
- Poor or missing power/ground to the sensor circuit
- Water intrusion or contamination in the seat cushion or connector
Symptoms
- OCS warning light, SRS/airbag warning lamp illuminated on dash
- Occupant classification status shows incorrect/unknown occupancy (via scan tool)
- Airbag may be disabled for the front passenger or deploy logic changed
- Possible diagnostic trouble codes stored related to seat/OCS circuits
- Intermittent or persistent faults triggered by seat movement
What to check
- Retrieve freeze frame and live data from SRS/OCS module with a diagnostic scan tool
- Record occupant classification status and any associated fault codes
- Visually inspect seat cushion, seatback and under-seat area for water damage, debris or foreign objects
- Check connectors at the sensor pad and seat module for corrosion, bent pins, push-tab damage or improper seating
- Inspect wiring harness for chafing, breaks, stretches, or recent service areas where connectors were disconnected
- Verify battery voltage and fuses related to SRS/OCS circuits
Signal parameters
- Supply voltage to sensor: typically battery voltage or switched 5 V/12 V depending on design (check manufacturer specs)
- Ground continuity and resistance to chassis ground (should be near 0 Ω)
- Sensor output: analog resistance or voltage range change with load on seat pad (consult OEM expected values)
- Communication bus messages where applicable (CAN/LIN) showing OCS status bytes
- Expected resistance of strain gauge or mat at known load points (manufacturer-specific)
Diagnostic algorithm
- Read and record all OCS/SRS codes and live data with an appropriate scan tool. Note occupant classification status and any freeze-frame data.
- Follow manufacturer safety procedures for SRS work: disable SRS (disconnect battery and wait specified time) before accessing connectors or seat components.
- Perform a visual inspection of seat cushion, sensor mat surface and connectors. Look for contamination, liquid, or physical damage.
- Unplug the OCS sensor connector at the seat module. Inspect pins for corrosion, bending or push-tab damage. Repair or replace connector as needed.
- Check power and ground at the sensor connector with key on (per manufacturer safe procedure). Verify supply voltage and ground continuity to the module.
- Measure sensor output/resistance across sensor terminals while applying known load to the seat (or using a multimeter/ohmmeter); compare to OEM specifications. Look for open, short or out-of-range values.
- If intermittent, perform wiggle tests on the harness and connectors while monitoring live data for changes. Repair any wiring harness faults (splice, replace harness section, secure routing).
- If wiring and connectors are good but sensor out of spec, replace the occupant classification sensor pad or seat module per OEM procedures.
- After repair or part replacement, reconnect everything, clear DTCs, and perform required occupant classification recalibration/relearn procedure using the OEM diagnostic tool.
- Verify SRS/OCS lamp extinguishes and confirm correct occupant classification status in live data; road-test if required to confirm no recurrence.
Likely causes
- Frayed or pinched seat wiring harness hot spot under the seat
- Connector corrosion from spilled liquid or damp environment
- Failed sensor pad (strain gauge or pressure mat) from wear or impact
- Seat removal or recent repairs disturbed harness or connectors
- Faulty module or internal sensor electronics
Fault status
Status
Occupant Classification System sensor circuit fault detected — inspect sensor, wiring, connectors, power/ground and perform required recalibration after repair.
Repair difficulty: Medium
Diagnostic time: 1.0 - 3.0 hours
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Code
B2213
HUMMER
B — Body
Right Front Switch on Left Front Door Stuck Down Position
AI status
Completed
Completed
100%
Causes
- Damaged or corroded connector at the OCS sensor or seat module
- Broken or shorted wiring in the seat harness (open, short to ground, short to battery)
- Faulty occupant classification sensor pad/strain gauge or sensor module
- Faulty occupant classification / airbag module or related ECU
- Poor or missing power/ground to the sensor circuit
- Water intrusion or contamination in the seat cushion or connector
Symptoms
- OCS warning light, SRS/airbag warning lamp illuminated on dash
- Occupant classification status shows incorrect/unknown occupancy (via scan tool)
- Airbag may be disabled for the front passenger or deploy logic changed
- Possible diagnostic trouble codes stored related to seat/OCS circuits
- Intermittent or persistent faults triggered by seat movement
What to check
- Retrieve freeze frame and live data from SRS/OCS module with a diagnostic scan tool
- Record occupant classification status and any associated fault codes
- Visually inspect seat cushion, seatback and under-seat area for water damage, debris or foreign objects
- Check connectors at the sensor pad and seat module for corrosion, bent pins, push-tab damage or improper seating
- Inspect wiring harness for chafing, breaks, stretches, or recent service areas where connectors were disconnected
- Verify battery voltage and fuses related to SRS/OCS circuits
Signal parameters
- Supply voltage to sensor: typically battery voltage or switched 5 V/12 V depending on design (check manufacturer specs)
- Ground continuity and resistance to chassis ground (should be near 0 Ω)
- Sensor output: analog resistance or voltage range change with load on seat pad (consult OEM expected values)
- Communication bus messages where applicable (CAN/LIN) showing OCS status bytes
- Expected resistance of strain gauge or mat at known load points (manufacturer-specific)
Diagnostic algorithm
- Read and record all OCS/SRS codes and live data with an appropriate scan tool. Note occupant classification status and any freeze-frame data.
- Follow manufacturer safety procedures for SRS work: disable SRS (disconnect battery and wait specified time) before accessing connectors or seat components.
- Perform a visual inspection of seat cushion, sensor mat surface and connectors. Look for contamination, liquid, or physical damage.
- Unplug the OCS sensor connector at the seat module. Inspect pins for corrosion, bending or push-tab damage. Repair or replace connector as needed.
- Check power and ground at the sensor connector with key on (per manufacturer safe procedure). Verify supply voltage and ground continuity to the module.
- Measure sensor output/resistance across sensor terminals while applying known load to the seat (or using a multimeter/ohmmeter); compare to OEM specifications. Look for open, short or out-of-range values.
- If intermittent, perform wiggle tests on the harness and connectors while monitoring live data for changes. Repair any wiring harness faults (splice, replace harness section, secure routing).
- If wiring and connectors are good but sensor out of spec, replace the occupant classification sensor pad or seat module per OEM procedures.
- After repair or part replacement, reconnect everything, clear DTCs, and perform required occupant classification recalibration/relearn procedure using the OEM diagnostic tool.
- Verify SRS/OCS lamp extinguishes and confirm correct occupant classification status in live data; road-test if required to confirm no recurrence.
Likely causes
- Frayed or pinched seat wiring harness hot spot under the seat
- Connector corrosion from spilled liquid or damp environment
- Failed sensor pad (strain gauge or pressure mat) from wear or impact
- Seat removal or recent repairs disturbed harness or connectors
- Faulty module or internal sensor electronics
Fault status
Status
Occupant Classification System sensor circuit fault detected — inspect sensor, wiring, connectors, power/ground and perform required recalibration after repair.
Repair difficulty: Medium
Diagnostic time: 1.0 - 3.0 hours
Similar codes
Repair manuals
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138
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