B10DA

Code

Generic B — Body

Passenger Seat Occupancy Sensor Circuit Failure

Brand: Generic

Type: B — Body

Views: UK: 16 EN: 58 RU: 16

AI status

Completed

ready

Completed 100%

Page language: EN

Causes

Faulty passenger seat occupancy sensor (pressure/resistance or capacitive pad)
Damaged wiring harness (open, short to ground or to battery, high resistance)
Corroded or loose connector at the seat sensor or ECU
Water/moisture intrusion in seat cushion or connector
Seat cushion damaged or sensor element physically degraded
Faulty SRS/airbag control module or software issue

Symptoms

Airbag (SRS) warning lamp ON
Passenger airbag may be disabled or incorrectly enabled
Seatbelt reminder or chime behaves incorrectly for passenger
Inability to detect passenger (airbag inhibited with occupant present) or false occupancy
Intermittent warnings when seat is moved or after rain/cleaning
Vehicle fails safety inspection related to SRS

What to check

Read and record freeze-frame and all related SRS/seat codes with a capable scan tool
Visual inspection of the passenger seat, connectors and wiring harness for damage, corrosion or water
Wiggle test wiring and connectors while monitoring live occupant sensor data for intermittent changes
Check for signs of aftermarket parts (seat covers/heaters) that may affect sensor
Verify proper seat mounting and that sensor elements are not pinched
Confirm battery voltage is stable and SRS module communicates normally

Signal parameters

Connector reference voltage (key ON, engine OFF): typically a regulated 5 V or supply in the module — consult vehicle-specific spec
Sensor signal voltage: typically 0–5 V or 0.5–4.5 V depending on design (vehicle-specific expected value when unoccupied and occupied)
Passive mat resistance: common passive mats show hundreds to low thousands of ohms when intact; open-circuit = OL/infinite
Short condition: near 0 Ω indicates short to ground/battery
Digital/classification output: raw occupancy value often reported as a percentage or 0–255 integer on scan tool (vehicle-specific thresholds apply)

Diagnostic algorithm

Safety first: follow manufacturer SRS handling procedures. Disable the 12V battery and wait the recommended time before disconnecting SRS connectors or removing the seat.
Connect a dedicated SRS-capable scan tool and confirm the B10DA code plus any related codes. Record live data for the passenger occupancy sensor.
Perform a visual inspection: remove seat trim as needed, inspect the sensor mat, wiring harness, and connector for damage, corrosion, water, or foreign objects.
Reconnect battery (per procedure) and with the scan tool monitoring live data, gently wiggle wiring and connectors under the seat. Look for intermittent changes or code reappearance.
With key ON (engine OFF) measure reference voltage and sensor signal at the seat connector. Compare values to vehicle-specific specifications. Check for open circuits or shorts to ground/ignition.
Check continuity between the seat sensor connector and the SRS control module for all signal, power and ground pins. Repair any high-resistance joints or breaks.
If the mat/sensor is removable, bench-test the sensor per service manual: measure resistance/voltage and simulate occupant load (use appropriate resistive load or approved test tool) to verify expected output.
Inspect for and remove any aftermarket seat covers or heaters that could interfere; temporarily test without them fitted.
If wiring, connectors and sensor check good, consider reflashing or replacing the SRS control module only after verifying module communications and following manufacturer diagnostics.
Clear codes, perform built-in self-tests and verify proper system behavior: verify passenger airbag enable/disable logic with known occupant weights and ensure no code returns after a test drive.

Likely causes

Failed occupant detection mat/sensor element
Damaged or disconnected connector under the seat
Short/open in seat wiring harness caused by seat movement
Water intrusion or corrosion at sensor or connector
Faulty SRS control module (less common)

Fault status

⚠️ Status

Passenger seat occupancy sensor circuit failure detected. Passenger detection may be unreliable; inspect seat sensor, wiring harness, connectors and SRS control module per service procedure.

🟡 Repair difficulty: Medium

⏱️ Diagnostic time: 1.0-3.0 hours