B10C0

Code

Generic B — Body

Occupant Classification System Fault

Brand: Generic

Type: B — Body

Views: UK: 13 EN: 32 RU: 17

AI status

Completed

ready

Completed 100%

Page language: EN

Causes

Faulty occupant classification sensor(s) or mat
Damaged wiring harness or connector (seat to chassis/SRS module)
Water intrusion or seat cover damage affecting sensor readings
Corroded or loose connector pins at SRS/OCS module
OCS module or SRS control unit software or hardware fault
Incorrect seat assembly, aftermarket seat cover, or foreign objects on the seat

Symptoms

SRS/airbag warning lamp illuminated
Passenger airbag status light showing disabled or “check”
Inability to enable/disable passenger airbag as expected
Diagnostic trouble code B10C0 stored in SRS/airbag control unit
Possible incorrect passenger airbag deployment logic (system warning)

What to check

Use a capable scan tool to read all stored SRS/OCS codes and freeze frame data
Verify whether SRS warning lamp is on and passenger airbag status indicator behavior
Visual inspection of seat area: check seat covers, heavy objects, water stains, or damage
Inspect connectors under the seat and at the SRS/OCS module for corrosion, bent pins, or loose terminals
Check service information for occupant sensor resistance/voltage specifications and wiring diagrams
Confirm whether recent work (seat removal, module replacement, battery disconnect) occurred; check for required relearn/calibration procedures

Signal parameters

Occupant sensor mat resistance (ohms) — compare to manufacturer spec (typical mats show distinct resistance ranges for empty vs occupied)
Supply voltage to OCS sensors (~5 V reference) and ground continuity
Signal voltage or CAN message values from occupancy module to SRS control module (use data list/live data)
Self-test status bits and fault counters from SRS/OCS module
Wake/sleep state of occupant sensors (sensors must wake when seat is occupied)

Diagnostic algorithm

Connect a diagnostic scanner with SRS/OCS capability. Read and record B10C0 and any related codes and freeze frame data. Note whether code is current or historic.
Confirm SRS warning lamp operation and passenger airbag status. Do not disable airbags for testing unless required by shop procedures.
Perform a visual inspection under and around the seat for water intrusion, heavy objects, aftermarket seat covers, or damage to the mat.
With battery disconnected per manufacturer procedure if required, inspect and reseat connectors under the seat and at the SRS control module. Look for corrosion, bent pins, pushed-out terminals.
Restore power and use live data to observe occupant sensor values (resistance or reported occupancy state) while a known test weight or a passenger sits on the seat. Compare to spec ranges.
Measure continuity and resistance of occupant mat circuits at the seat harness and at the module connector. Repair any open/short circuits or damaged wiring. Replace seat harness or mat if out-of-spec or water-damaged.
If wiring and mat check OK, verify SRS/OCS module supply voltages and grounds. Replace or reprogram module only after confirming wiring and sensors are good.
If components are replaced, perform required occupant classification system calibration/relearn procedure per manufacturer service information.
After repairs and calibration, clear codes and perform road or system checks to confirm code does not return. Record results and advise customer of any seat-cover or accessory limitations that may affect system operation.

Likely causes

Open/short in occupancy sensor mat circuit
High or out-of-range resistance in sensor mat (cut wires, moisture)
Intermittent connector contact or pin corrosion
Improper calibration or failed OCS self-test after battery disconnect or module replacement

Fault status

⚠️ Status

Occupant Classification System malfunction detected. SRS control unit has logged fault B10C0; passenger airbag enable/disable logic may be affected. Inspect occupant sensors, wiring, connectors and perform required calibration before returning vehicle to service.

🟡 Repair difficulty: Medium

⏱️ Diagnostic time: 1.0-3.0 hours