B1D19

Code

LAND ROVER B — Body

Passenger presence sensor circuit fault

Brand: LAND ROVER

Type: B — Body

Views: UK: 15 EN: 26 RU: 20

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Page language: EN

Causes

Damaged or shorted passenger presence (seat mat) sensor
Poor connector contact, bent pins or corrosion at seat/ECU connectors
Broken or chafed wiring harness (under-seat area)
Water/moisture ingress in seat or connectors
Faulty occupant detection module or airbag control module
Software/firmware calibration or configuration error

Symptoms

Airbag warning lamp illuminated
Passenger airbag status message may read 'OFF' or be unavailable
Instrument panel displays occupant detection fault or service message
Possible inability to register a passenger (airbag may remain disabled)
Occasional/erratic passenger airbag status changes with seat movement

What to check

Read stored and active DTCs and freeze-frame data with a capable scan tool
Check for related DTCs (airbag, LIN/CAN, seatbelt buckle) and history
Visually inspect seat, connectors and harness under the passenger seat for damage, corrosion or moisture
Check connector retention, bent pins and terminal corrosion at sensor and airbag control module
Verify vehicle battery voltage and ground integrity before testing SRS circuits
Confirm any manufacturer Technical Service Bulletins (TSBs) or recall campaigns

Signal parameters

Sensor type: typically low-voltage occupant detection (capacitive/pressure mat) or seat occupancy loop
Supply reference: commonly 5 V or switched low-voltage supply (manufacturer-specific) — verify exact value from service data
Signal output: varies with load/occupancy; expected voltage or resistance ranges are vehicle-specific (consult factory values)
Expected continuity: no open circuits between sensor connector and airbag module; resistance should change when weight applied to mat
Communication: some systems report via airbag module or LIN/CAN messages—verify bus traffic if applicable

Diagnostic algorithm

Read and record DTCs, freeze frame and any related codes using a manufacturer-capable scan tool. Note whether the code is current or historic.
Confirm battery voltage and perform a basic electrical system health check. Disconnect battery only following manufacturer SRS safety procedures if required.
Perform a visual inspection of the passenger seat area: remove trim as needed and inspect seat mat/sensor, wiring harness, connectors and retainers for damage, corrosion or moisture.
With ignition on (follow SRS safety guidance), back-probe the sensor connector and verify supply voltage and ground reference per manufacturer data. Check for intermittent faults by moving the seat and harness.
Measure sensor output or resistance while applying/removing weight to the seat mat to confirm the sensor responds. Compare to published values or known-good sensor if available.
Check connector pin integrity and continuity between the sensor connector and the airbag/occupant module. Repair any open/shorted wiring or corroded terminals.
If wiring and connectors are good but sensor output is out of specification, bench-test or replace the passenger presence sensor/mat per service procedure.
If sensor and wiring test good, check airbag control/occupant detection module operation and software level. Reflash or replace module only after verifying upstream components.
After repair, clear codes and perform a full system scan. Verify functionality by confirming passenger detection changes with weight and that no DTCs return.
Document repairs and advise customer about moisture/food/liquid risks to seat sensors and recommend preventive measures.

Likely causes

Connector corrosion or loose connector under the passenger seat
Damaged wiring in the seat harness from seat movement
Failed seat mat/occupant sensor due to wear or moisture
Module fault or programming issue (less common)

Fault status

⚠️ Status

Passenger presence sensor circuit fault — occupant detection signal invalid or out of range. Passenger airbag behavior may be disabled or changed until fault is resolved.

🟡 Repair difficulty: Medium

⏱️ Diagnostic time: 1.0-2.5 hours

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