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Home / DTC / B11B3 — Front Passenger Occupant Classification System Fault

B11B3 — Front Passenger Occupant Classification System Fault

Detailed page for trouble code B11B3.

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B11B3

LAND ROVER B — Body

Front Passenger Occupant Classification System Fault

Brand: LAND ROVER
Type: B — Body
AI status
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Page language: EN

Causes

  • Damaged or worn passenger seat occupant sensor mat (pressure/load sensors)
  • Open, short or high-resistance wiring between sensor mat and OCM
  • Corroded or disconnected seat harness connectors (under seat)
  • Water/moisture ingress into sensor mat or connectors
  • Faulty Occupant Classification Module or airbag ECU
  • Failed calibration or software anomaly after seat removal/repair

Symptoms

  • Airbag/airbag warning light illuminated
  • Front passenger airbag status incorrect (disabled when occupied or vice versa)
  • DTC B11B3 stored in SRS/occupant classification module
  • Possible fault codes related to SRS/CAN communications present
  • Inability to perform occupant classification calibration

What to check

  • Read DTCs and freeze-frame data with a capable diagnostic tool (SRS/OCM module)
  • Check vehicle battery voltage is within specification before testing
  • Visually inspect seat, trim and underside for damage, contamination or moisture
  • Inspect and reseat/inspect connectors under passenger seat; check for corrosion or bent pins
  • Check wiring harness for chafing, breaks or pinched sections between seat and body
  • Monitor live data for occupant sensors while applying known weights or sitting in seat

Signal parameters

  • Occupant sensor element voltages (V) or signal voltage per element
  • Sensor mat element resistances (ohms) or sensor matrix values
  • Passenger Occupancy status (bit/enum) from OCM
  • Seat belt buckle switch status (latched/unlatched)
  • OCM diagnostic status and fault flags
  • CAN messages between OCM and Airbag ECU (IDs and data payload vary by model)

Diagnostic algorithm

  1. Follow manufacturer SRS safety procedures before working on seat/airbag circuits (disable power, wait specified time).
  2. Connect a compatible scan tool, read DTCs and note freeze-frame/live-data related to occupant sensors and CAN communication.
  3. Perform a visual inspection of the passenger seat: remove trim if required and check sensor mat, foam, harness routing and connectors for damage, moisture or debris.
  4. With ignition on (as per service manual) monitor live sensor values while applying known weights or sitting in seat — look for inconsistent or missing element readings.
  5. Inspect and test continuity between sensor mat connector pins and OCM connector pins; check for opens/shorts to ground or battery. Repair any damaged wiring.
  6. If a single sensor element is out of specification, replace the sensor mat or repair sensor wiring according to manufacturer procedures.
  7. Check connector pins for corrosion, clean or replace connectors as needed and verify proper mating/clips.
  8. If wiring and mat test OK, check CAN communication to OCM/airbag ECU; if CAN messages are missing or corrupted, diagnose CAN network and modules.
  9. If module fault suspected after component checks, consult manufacturer service data for module replacement and reprogramming requirements.
  10. After repairs, perform occupant classification calibration/relearn using manufacturer diagnostic tool, clear codes and recheck live data and system operation.

Likely causes

  • Sensor mat element failure (one or more elements out of range)
  • Pinched/damaged cable from seat to connector causing intermittent signal
  • Connector with bent pins or corrosion causing poor contact
  • Module reports inconsistent CAN messages or missing data
  • Recent seat removal or repair left connectors unplugged or mis-routed
  • Water spilled into seat area causing resistor drift or short

Fault status

⚠️ Status
B11B3 - Front Passenger Occupant Classification System Fault (OCS fault)
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1-3 hours

Similar codes

B11B0 B11B1 B11B2 B11B4 B1100
413

Browse 413 LAND ROVER manuals: repair procedures, diagnostics, wiring diagrams, component locations, service data and Labor Times by year, model and trim.

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