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Home / DTC / B1D06 — Driver seat occupant detection sensor circuit fault

B1D06 — Driver seat occupant detection sensor circuit fault

Detailed page for trouble code B1D06.

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B1D06

LAND ROVER B — Body

Driver seat occupant detection sensor circuit fault

Brand: LAND ROVER
Type: B — Body
Views: UK: 7 EN: 13 RU: 9
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Page language: EN

Causes

  • Open or shorted wiring between driver seat mat sensor and Occupant Classification Module (OCM)/airbag module
  • Corroded or damaged seat connector pins or terminals
  • Damaged occupant detection sensor mat (water intrusion, torn, crushed)
  • Poor ground or lost reference voltage to the sensor
  • Faulty seat control/occupant classification module
  • Aftermarket seat covers, cushions, or incorrectly reinstalled seat components affecting the mat

Symptoms

  • SRS/airbag warning light illuminated
  • Passenger/driver airbag status incorrect or passenger airbag disabled
  • Occupant detection/seat belt reminder behaving incorrectly
  • Stored B1D06 DTC (may be accompanied by related SRS codes)
  • Possible inability to complete occupant classification calibration

What to check

  • Read/record all stored SRS and occupant classification codes and freeze frame data with a capable scan tool
  • Inspect driver seat area for signs of water, contamination, damage or aftermarket covers
  • Visually inspect and unplug seat electrical connectors; check for corrosion, bent pins or debris
  • Verify power, ground and reference voltage at the seat connector with key on (use service manual pinouts)
  • Check continuity between sensor mat connector pins and the occupant classification/airbag module
  • Use live data to observe seat sensor values while applying weight to the seat

Signal parameters

  • Seat sensor output: analog voltage or resistance value reported to OCM (varies by model) — should change predictably when weight applied
  • Reference voltage present at sensor connector (commonly 5 V or vehicle-specified reference)
  • Circuit continuity: no open or short to ground/12V on sensor signal wiring
  • Diagnostic trouble code stored in Occupant Classification/airbag module (B1D06) and related SRS codes
  • CAN/SWS messages: OCM health/status messages present on vehicle network (verify with scan tool)

Diagnostic algorithm

  1. Safety first: follow manufacturer SRS safety procedures. Disable the battery and wait the specified time before seat removal or connector work.
  2. Use a factory-capable scan tool, read and record all SRS/occupant classification codes, live data and freeze frame. Note whether code is current or historical.
  3. Perform a visual inspection of the driver seat, underside, connectors and wiring harness for damage, moisture or aftermarket items (covers, cushions).
  4. With connectors accessible, inspect pins for corrosion, bending or pushed-out terminals. Clean or repair as required.
  5. Reconnect, clear codes and observe live seat sensor data while an assistant sits or applies known weight to the driver seat. Verify the signal changes and that no intermittent faults occur when moving the seat/harness.
  6. Measure reference voltage, sensor signal and ground at the seat connector according to the service manual pinout. Check for opens/shorts and compare to expected ranges in factory data.
  7. Perform continuity checks between the sensor pins and the occupant classification/airbag module pins. Wiggle wiring at seat rails to check for intermittent breaks.
  8. If sensor mat shows abnormal resistance or no response, remove seat and bench-test or replace the sensor mat as specified by manufacturer procedures.
  9. If wiring and sensor are good, test or replace the occupant classification/seat control module per service procedures. Reprogram or update software if required.
  10. After repairs, clear codes and perform the mandated occupant classification/seat calibration/learning procedure and confirm the SRS lamp is off and the system reports normal operation.

Likely causes

  • Corrosion or bent pins at the seat-to-harness connector
  • Open circuit in harness from seat to module due to chafing at seat rail
  • Moisture ingress in sensor mat causing low resistance/short
  • Seat mat damaged from foam wear or previous repairs
  • Missing or failed module ground or reference feed

Fault status

⚠️ Status
Driver seat occupant detection sensor circuit fault detected. This fault affects the occupant classification system used by the SRS and may cause the airbag system to disable or show a warning lamp until the issue is resolved and the system calibrated.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1-3 hours

Similar codes

B1D07 B1D00 B1D01 B1D02
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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