B2035

Code

LAND ROVER B — Body

Occupant Classification System Fault - Front Passenger Seat

Brand: LAND ROVER

Type: B — Body

Views: UK: 20 EN: 30 RU: 22

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Page language: EN

Causes

Damaged or shorted occupant detection mat (seat cushion sensor)
Corroded, loose, or disconnected wiring harness or connector at the passenger seat
Water/moisture ingress into the seat cushion or connectors
Poor or intermittent ground or reference voltage to the seat sensor
Faulty occupant classification sensor/module in the seat
Faulty airbag/occupant control module or internal software/calibration error

Symptoms

SRS / airbag warning lamp illuminated on instrument cluster
Passenger airbag status may show "OFF" or a warning on dash despite occupant present
Passenger airbag disabled or not arming for front passenger seat
Seatbelt pretensioner for passenger side may be disabled or flagged
Intermittent enabling/disabling of passenger airbag when occupant shifts or moves seat
Stored B2035 (and possibly related occupant system) codes in airbag/ECU memory

What to check

Read and record DTCs and freeze frame data from the SRS/airbag module first
Verify SRS warning lamp behavior and any passenger airbag status messages
Visually inspect passenger seat and cushion area for signs of liquid contamination or damage
Inspect wiring harness and connectors at the passenger seat base for corrosion, bent pins, loose terminals or water intrusion
Check that seat plugs are fully seated and locking retainer clips are engaged after any seat removal
Inspect vehicle ground points and reference power feed for the seat sensors

Signal parameters

Reference supply/diagnostic voltage to OCS sensor: typically 5 Vdc (confirm with vehicle-specific manual)
Sensor signal: nominal 0–5 V analog range (dependent on sensor element and ECU interpretation)
Cushion sensor resistance/continuity: expect continuity and sensor resistance within manufacturer-specific range (example cushions often measure in the 0.5 kΩ–50 kΩ range depending on sensor type) — compare to workshop manual values
CAN bus messages: occupant classification messages present at normal update rate (typically 10–100 ms) and nominal voltage levels for CAN high/low (approx. 2.5 V idle)
Ground continuity: near 0 Ω to chassis ground (verify

Diagnostic algorithm

Read and record all SRS/airbag related DTCs and freeze frame data using a capable diagnostic tool; note any history or intermittent flags.
Check for technical service bulletins or required calibrations for the occupant classification system for this model/year.
Visually inspect the passenger seat cushion, upholstery and connector areas for signs of moisture, contamination or physical damage.
With battery voltage present, inspect connectors at the seat base: unplug and examine terminals for corrosion, bent pins or water — clean and reconnect ensuring secure latch.
Measure reference voltage at the seat sensor connector (consult wiring diagram): verify 5 V reference (or specified value) and good ground. If reference missing, trace back to fuse/relay/ECU.
Check continuity/resistance of the cushion sensor circuits to detect open or shorted elements; compare measured values to vehicle-specific specifications.
Use an oscilloscope or data logger (if available) to observe the sensor output while applying known weights or sitting on the seat to see if the signal varies smoothly and within expected range.
Verify occupant classification CAN messages and data values from the airbag/OCS module with diagnostic tool. If messages absent or erratic, suspect wiring/module fault.
If wiring and connectors test good and sensor values are out of range, consider replacing the seat cushion sensor mat or seat sensor module. After replacement, perform required calibration or occupant system self-test per factory procedure.
If replacement of seat sensor does not clear fault, test or replace the SRS/airbag control module only after confirming all peripheral wiring and sensors and performing module programming/calibration as required.
Clear DTCs and perform road test or occupant simulation to confirm fault does not return; verify SRS lamp extinguishes and passenger airbag status is correct.

Likely causes

Moisture or liquid contamination of the seat cushion mat or connector
Corroded/poor connector at the seat module harness (common at seat base)
Internal failure of the cushion sensor mat (broken traces or sensor elements)
Ground or reference voltage problem to the seat sensor

Fault status

⚠️ Status

Front passenger Occupant Classification System fault detected. Passenger airbag or pretensioner may be disabled for safety until fault is resolved.

🟡 Repair difficulty: Medium

⏱️ Diagnostic time: 1-3 hours

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B2035 — Occupant Classification System Fault - Front Passenger Seat