B1D15

Code

LAND ROVER B — Body

Occupant classification system — passenger presence sensor fault

Brand: LAND ROVER

Type: B — Body

Views: UK: 11 EN: 15 RU: 5

AI status

Completed

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Page language: EN

Causes

Faulty passenger presence sensor mat (pressure/weight sensor)
Damaged or corroded connector(s) under the passenger seat
Broken, pinched or shorted wiring in the sensor harness
Poor seat repair/incorrect refit or aftermarket seat covers interfering with the sensor
Water/moisture ingress in the seat or connector
Occupant classification module or SRS control module fault

Symptoms

SRS / airbag warning light illuminated on instrument cluster
Passenger airbag may be disabled or an incorrect airbag status message displayed
Passenger presence/airbag indicator behaves inconsistently (on/off)
Stored fault code(s) in the vehicle diagnostic system (B1D15 and possibly others)
Seat belt reminder or other occupant-detection related messages

What to check

Read all stored and pending SRS/occupant classification codes and freeze-frame data with a capable diagnostic tool
Verify SRS warning lamp behavior and any passenger airbag status indicators
Visually inspect passenger seat for contamination, damage, or aftermarket covers
Inspect and reseat the connector(s) under the passenger seat; check for corrosion, bent pins or water
Perform continuity and resistance checks of the sensor mat harness per service manual
Scan network communications (CAN/vehicle bus) to confirm occupant module messaging and no bus errors

Signal parameters

Passenger presence sensor: multi-zone resistive/pressure mat — resistance values change with applied load (refer to manufacturer specifications)
Sensor circuit continuity between mat connector and occupant classification module (expected: low resistance continuity when intact)
Voltage supply to the sensor circuit: nominal vehicle reference voltage (check per manual; typically battery/ignition supply) and ground continuity
Occupant classification module reports occupancy status over the vehicle bus (CAN) — verify messages present and consistent
Diagnostic tool live data: occupant status, sensor fault flags, and any raw sensor channel readings where available

Diagnostic algorithm

Connect a diagnostic tool capable of reading SRS/occupant classification codes. Record all codes, freeze-frame and live data.
Confirm the fault is current (active) and note any related SRS codes. Do not attempt repairs until you have read all data.
Visually inspect the passenger seat surface and underside for stains, moisture, damage, foreign objects or aftermarket covers. Remove covers that could affect sensor operation.
With ignition off and following manufacturer safety procedure for SRS systems (including battery isolation if required), access the seat connectors. Inspect pins for corrosion, bent pins or water. Reseat connectors.
With access to the connector, check continuity and resistance of the sensor mat circuits per the workshop manual. Wiggle the harness and move the seat through its range to check for intermittent faults.
Check power and ground at the sensor connector with the ignition on (use service manual pin-out). Verify supply voltages and grounds are within specification.
Scan vehicle bus to ensure the occupant classification module is communicating. Compare live occupant status values to the actual seat condition (empty, child seat, adult).
If wiring and connectors are good but mat readings are out of specification or intermittent, replace the passenger presence sensor mat assembly.
If new mat does not clear the fault, consider occupant classification module or SRS control module fault — consult manufacturer diagnostics for module testing and replacement criteria.
After repair or replacement, perform any required occupant classification system calibration or SRS system initialization using the diagnostic tool per manufacturer procedure. Clear codes and verify correct system operation.
Safety note: Always follow the vehicle manufacturer's SRS handling procedures (battery disconnect time, recommended tooling and calibration steps). Airbag systems are safety-critical — if unsure, defer to qualified SRS technicians.

Likely causes

Connector under the seat is corroded or not fully seated
Sensor mat elements damaged by impact, sewing or foreign objects (e.g., spilled liquid)
Wiring chafed where it routes under the seat and intermittent when the seat is moved
Aftermarket seat cover or cushion changing pressure distribution and triggering fault
Module software fault or lost calibration after seat work

Fault status

⚠️ Status

Passenger presence sensor fault — Occupant classification system. Inspect sensor mat, connectors and wiring; perform diagnostic testing and recalibration as required.

🟡 Repair difficulty: Medium

⏱️ Diagnostic time: 0.5-2.5 hours

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