B0282

Code

Generic B — Body

Occupant classification sensor circuit short to ground

Brand: Generic

Type: B — Body

Views: UK: 13 EN: 21 RU: 17

AI status

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Page language: EN

Causes

Damaged or chafed wiring harness under the seat making contact with chassis ground
Corroded, bent or pushed‑out connector pins creating an unintended ground
Moisture or liquid intrusion in the sensor, connector, or wiring
Internal failure (short) inside the occupant classification sensor / sensor mat
Incorrectly installed aftermarket seat covers, heaters or wiring routed against harness
Poor or missing ground at SRS/seat module or body ground affected by corrosion

Symptoms

SRS/airbag warning lamp illuminated on instrument cluster
Passenger airbag may be disabled or will not toggle correctly
Occupant classification messages or warnings on driver display (if equipped)
Seat weight/occupancy may read incorrect or show no occupant in live data
Possible inability to pass SRS system self-test or complete readiness checks

What to check

Read and record all SRS/airbag codes and freeze‑frame data with a compatible scan tool
Verify if the code is current or historical and note any related SRS/body codes
Visually inspect seat area: connectors, wiring looms, seat rails, and sensor mat for damage or moisture
Inspect and wiggle seat harness and connectors while monitoring live data to reproduce fault
Check connector mating surfaces for bent pins, corrosion, or pushed pins
Measure resistance/continuity between the sensor signal wire and chassis ground (see signal parameters)

Signal parameters

Typical reference/communication: many occupant sensors use low-voltage signal or CAN to module—check manufacturer specs before testing
Short-to-ground indicator: signal node voltage close to 0.0–0.5 V (with ignition ON and reference powered) suggests a direct short to ground
Normal sensor signal range (generic): roughly 0.5–4.5 V or mid-range ~2–3 V depending on design — consult OEM data for exact values
Continuity: direct short to ground often shows very low resistance (
If the sensor is a resistive mat, expected resistance values vary widely by design — use OEM service data

Diagnostic algorithm

Safety first: follow manufacturer service procedure to disable SRS system power (disconnect battery and wait specified time, or use recommended SRS power‑down procedure) before removing trim or working near airbags
Scan tool: connect a qualified SRS scan tool and read current/frozen codes and live data for occupant classification sensors.
Reproduce: with ignition ON and SRS enabled, monitor live data while carefully moving the seat and harness; note when the fault sets.
Visual inspection: remove seat trim as needed. Inspect the occupant classification sensor mat, harness routing, connector locking tangs, and pin condition. Look for chafing against seat rails, metal, or sharp edges.
Connector test: disconnect the seat sensor connector(s) and inspect pins. Check for water intrusion, corrosion, bent pins, or debris. Clean and reseat securely.
Electrical test: with harness unplugged, measure resistance between the sensor signal conductor and chassis ground. A very low resistance (
Isolate harness: if short persists with sensor disconnected from module, trace wiring toward module and inspect/repair sections that short to ground. If short only present when sensor connected, suspect sensor internal short or contaminated mat.
Repair: repair damaged wiring with proper splice techniques, replace or repair connectors, replace occupant classification sensor/mat if internally shorted, and restore any compromised ground points.
Reassemble and test: clear codes, reconnect battery/power per procedure, perform SRS self-test and verify live data returns to normal and code does not reappear.
Note: always follow OEM SRS handling, calibration, and calibration/relearn procedures after replacement.

Likely causes

Wiring abrasion at seat rail or connector (most common)
Connector corrosion or entrapped foreign object allowing contact with ground
Internal short in the sensor mat caused by moisture or mechanical damage

Fault status

⚠️ Status

The SRS control module reports a short to ground on the occupant classification sensor circuit. The fault will set an airbag/SRS warning and can disable passenger airbag operation until the circuit is repaired.

🟡 Repair difficulty: Medium

⏱️ Diagnostic time: 1.0-2.5 hours