B136D

Code

LAND ROVER B — Body

Front passenger occupant detection sensor circuit fault

Brand: LAND ROVER

Type: B — Body

Views: UK: 10 EN: 18 RU: 13

AI status

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Page language: EN

Causes

Damaged or disconnected occupant detection sensor (seat mat/pad)
Broken, chafed or corroded wiring in the sensor harness
Poor or corroded connector at sensor or SRS control module
Water/moisture ingress into seat or connector
Faulty seat occupancy/classification module
Faulty SRS (airbag) control module or software anomaly

Symptoms

SRS/AIRBAG warning lamp illuminated on dash
Passenger airbag status message may indicate OFF, UNAVAILABLE or ERROR
Passenger-side airbag disabled or unreliable occupant detection
Possible intermittent SRS warning that changes with seat position or passenger movement
Diagnostic trouble codes stored in SRS module related to occupant detection

What to check

Retrieve codes and freeze frame using a capable diagnostic tool that supports Land Rover SRS modules
Inspect passenger seat (cushion and underside) for water, damage, aftermarket covers or foreign objects
Visually inspect connectors and wiring between the seat sensor and SRS control module for corrosion, pins pushed out, or damage
Check for TSBs and software updates for the SRS/occupant detection system
With ignition ON, monitor live data for occupant sensor status and signal values while moving seat and applying load to seat
Check fuses and main SRS power/ground circuits related to passenger sensing

Signal parameters

Reference supply to sensor typically provided by SRS module — consult manufacturer service data (often 5 V reference or module-supplied excitation)
Expected signal: variable voltage or resistance/capacitance depending on sensor type — typically a measurable variable between ~0–5 V (voltage-type) or a changing resistance/capacitance value; open-circuit = no signal (OL), short-to-ground ~0 V, short-to-supply ~reference voltage
Ground continuity: low resistance between sensor ground and chassis ground (near 0 Ω); high resistance indicates a poor ground
When available, compare live sensor values to manufacturer-specified ranges in service data; deviations indicate open, short or sensor failure

Diagnostic algorithm

Read and record DTCs and freeze frame with a dealer-level scan tool that supports SRS functions
Confirm active/inactive status of passenger airbag and any related warnings/messages
Perform visual inspection of seat, connectors and harness for damage, corrosion or water ingress; remove trim as needed
Check fuses and main SRS power/ground circuits; verify proper supply and ground at SRS module connector
Backprobe the occupant sensor connector with the ignition ON and observe reference, signal and ground circuits on a multimeter or scope. Compare to expected (see service data).
If signal is open or shorted, trace wiring from sensor to SRS module and repair any damaged sections; check connector pins for corrosion, bent or pushed-out terminals
If wiring and connectors test good but signal is out of range or inconsistent, disconnect the sensor and measure sensor element resistance or capacitance per service manual; replace sensor if out of specification
After repairs, clear codes and perform relearn/initialization procedures required by the manufacturer for the occupant classification system. Recheck for DTCs and verify correct passenger airbag status
If faults persist and wiring/sensor check good, inspect SRS control module for connector damage and consider module testing/replacement by a specialist or dealer (do not attempt to repair airbag module internals)
Always follow manufacturer safety procedures for SRS work: disconnect battery per service manual, wait required time for system capacitor discharge, and handle components safely

Likely causes

Open or shorted wiring between seat sensor and SRS module
Corroded/loose connector at the occupant detection sensor or SRS module
Failed occupant detection sensor (seat mat/pressure sensor)
Water intrusion into seat harness or sensor causing intermittent/short condition

Fault status

⚠️ Status

Front passenger occupant detection sensor circuit fault — the SRS/occupant classification system has detected an open, short or implausible signal from the passenger seat sensor. Passenger airbag availability may be disabled until fault is repaired.

🟡 Repair difficulty: Medium

⏱️ Diagnostic time: 1-3 hours

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