B2A0E

Code

Generic B — Body

Occupant Classification System: Fault Detected

Brand: Generic

Type: B — Body

Views: UK: 3 EN: 5 RU: 3

AI status

Completed

ready

Completed 100%

Page language: EN

Faulty occupant classification sensor pad (seat mat) or sensor array
Damaged or corroded wiring harness or connectors between sensor and OCS module
Faulty Occupant Classification Module (OCM) or airbag control module software/hardware fault
Poor ground or power supply to sensor or module
Water ingress, seat cover contamination, or debris affecting sensor readings
Failed or missing seat occupancy calibration or configuration mismatch

Read all stored codes and freeze frame data from SRS/OCM and body modules
Visually inspect seat connectors, harness routing and underside of seat for damage or moisture
Check for recent seat repairs, cover replacements or aftermarket accessories that may interfere
Verify power and ground at OCM and seat sensor connector(s)
Confirm proper software/calibration version and whether calibration has been completed

Seat sensor matrix: resistance or voltage sweep across sensor rows/columns (typical values vary by manufacturer)
Seat occupancy channel voltage: often 0–5 V proportional to load (check OEM spec)
Module supply voltage: normally battery voltage (≈11–14 V); check key-on and cranking
Ground continuity: near 0 Ω between sensor ground and chassis ground
CAN/vehicle bus: OccupantClassification or SRS messages present at expected refresh rate (e.g., 5–20 Hz)
DTC set conditions: sensor out-of-range or implausible sensor matrix values reported by OCM

Retrieve codes from SRS and related modules (record freeze frame and U-codes). Clear codes and attempt to re-run to confirm persistence.
Visually inspect passenger seat: remove trim access covers, inspect sensor mat, connectors, wiring harness routing, and for signs of moisture, corrosion or damage.
Verify battery voltage and check fuses related to seat/OCM and SRS circuits.
With ignition ON, probe power and ground at the seat sensor connector and OCM connector. Confirm expected supply voltage and good ground.
If available, use OEM scan tool to read live OCM sensor matrix values, voltages or resistance. Compare to OEM expected ranges or to the unoccupied/occupied baseline.
Wiggle test wiring and connectors while monitoring live data to reveal intermittent faults. Check connector pins for corrosion or bent pins.
If sensor values are out of range or shorted, disconnect seat sensor and measure resistance of sensor elements per service manual. Replace sensor mat if defective.
If wiring and sensor check OK, check CAN/SRS communication frames for errors. Repair bus faults as required.
If no wiring or sensor fault found, consider reflashing or replacing OCM/SRS module per manufacturer guidance. Verify calibration or run occupant classification calibration procedure after repairs.
After repair, clear codes and confirm no reoccurrence. Perform functional test and required safety system calibrations.