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Home / DTC / B1D22 — Front passenger occupant detection sensor circuit malfunction

B1D22 — Front passenger occupant detection sensor circuit malfunction

Detailed page for trouble code B1D22.

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B1D22

LAND ROVER B — Body

Front passenger occupant detection sensor circuit malfunction

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

Causes

  • Damaged or disconnected connector under the passenger seat
  • Broken/abraded wiring harness (open, short to ground or battery) between sensor and SRS control module
  • Faulty passenger occupant detection sensor/mat/module
  • Corrosion or water ingress in connector or sensor mat
  • Poor or missing ground at sensor or SRS module
  • SRS control module fault or software error

Symptoms

  • SRS / airbag warning lamp illuminated on dash
  • 'Service Airbag' or similar message displayed
  • Passenger airbag may be disabled or not deploy as intended (occupant not detected)
  • Passenger seatbelt reminder or indicator behaves incorrectly
  • Related occupant detection or SRS fault codes stored in SRS module

What to check

  • Read and record all SRS/airbag-related codes and freeze-frame data with a capable scan tool
  • Visual inspection under passenger seat: check connector latches, pins, corrosion, foreign debris and routing of harness along seat rails
  • Inspect sensor mat for signs of damage, moisture, creasing or foreign objects
  • Check for aftermarket seat covers or heaters and remove to test
  • Perform wiggle test on wiring/connectors while watching live occupant detection data for intermittent changes
  • Measure supply voltage and ground at sensor connector with ignition on (follow OEM SRS safety procedures)

Signal parameters

  • Type of signal: occupancy sensor typically reports a resistance/capacitance-based value or switched signal to the SRS control module (may be analog or digital depending on model)
  • Expected behavior: stable idle value when seat empty; value changes when a passenger is seated; no open-circuit or short-to-power/ground present
  • Fault indications: open circuit (infinite resistance), short to ground (near 0 Ω), short to battery (near 0 V to supply), or intermittent/fluctuating live-data values

Diagnostic algorithm

  1. Connect a diagnostic tool capable of SRS/airbag systems, read codes and freeze-frame, and note related stored codes.
  2. Follow SRS safety: disable ignition, disconnect battery per OEM procedure and wait required time before working near pyrotechnic devices.
  3. Visually inspect the passenger seat area: connectors, wiring routing, seat rails, and sensor mat condition. Remove seat trim as needed.
  4. Reconnect battery per safety procedure, power on and monitor live occupant detection data while performing a wiggle test on harness and connector to find intermittent faults.
  5. With ignition on and using service manual values, measure voltage and resistance at the occupant sensor connector; compare to OEM specifications. Check for open, short-to-ground, or short-to-battery.
  6. If wiring or connector fault found, repair or replace damaged sections, secure routing away from seat rails and moving parts, and protect with conduit as required.
  7. If wiring checks good but sensor mat/module is out of spec or damaged, replace the occupant detection sensor/mat assembly per manufacturer instructions.
  8. After replacement or repair, perform any required SRS/occupant system calibrations or zeroing with a diagnostic tool (many vehicles require calibration to restore correct occupant detection).
  9. Clear codes, cycle ignition, and verify the SRS warning lamp goes out and live data shows correct occupant detection behavior. Test with known loads (service manual test weights) if prescribed.
  10. If fault persists after sensor replacement and wiring verification, consider SRS control module diagnostics or professional manufacturer-level support.

Likely causes

  • Loose or corroded connector under passenger seat
  • Damaged wiring harness at seat rail or harness junction
  • Failed occupant detection sensor/mat
  • Water ingress causing intermittent shorts
  • Improperly installed aftermarket seat cover or accessory interfering with sensor

Fault status

⚠️ Status
Front passenger occupant detection sensor circuit malfunction — SRS/airbag system has detected a fault in the passenger presence sensor circuit; airbag/occupant detection may be disabled.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1.0-3.0 hours

Similar codes

B1D20 B1D21 B1D23 B1D24 B1D25
320

Browse 320 LAND ROVER manuals: repair procedures, diagnostics, wiring diagrams, component locations, service data and Labor Times by year, model and trim.

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