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Home / DTC / B2952 — Occupant classification sensor circuit malfunction

B2952 — Occupant classification sensor circuit malfunction

Detailed page for trouble code B2952.

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Code

B2952

Generic B — Body

Occupant classification sensor circuit malfunction

Brand: Generic
Type: B — Body
Views: UK: 0 EN: 0 RU: 0
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Page language: EN

Causes

  • Damaged or chafed wiring harness under the seat
  • Corroded, loose or contaminated connector at the occupant classification sensor or module
  • Faulty occupant classification sensor mat (pressure/resistive or capacitive mat)
  • Water/moisture intrusion into the seat or sensor connector
  • Poor ground or high resistance in ground circuit
  • Intermittent connection due to seat movement (harness routing issue)

Symptoms

  • DTC B2952 present in SRS/airbag control module memory
  • Passenger airbag disabled or passenger airbag status light/indicator illuminated
  • SRS warning light on instrument cluster
  • Incorrect occupant detection (system reports seat occupied when empty or vice versa)
  • Intermittent SRS lamp or DTC depending on seat position/movement

What to check

  • Read SRS module with a scanner that can show occupant classification sensor data and freeze frame
  • Confirm accompanying SRS/airbag codes (other B-codes) and note conditions (seat position, weight)
  • Visually inspect under-seat wiring harness, connectors and sensor mat for damage, moisture, corrosion or foreign objects
  • Check for aftermarket seat covers or modifications that could affect the mat
  • Check for TSBs or service bulletins for occupant classification system
  • Verify correct module programming/configuration for vehicle (replacement module/seat)

Signal parameters

  • Occupant sensor typically reports resistance, capacitance or a 0–5 V signal depending on design — compare to vehicle service manual values
  • Expected steady, stable signal with no intermittent drops when seat unoccupied or when a known weight is placed on seat
  • Continuity between sensor connector and SRS module (no open circuit) — reference resistance/ohm values from OEM manual
  • No error or drop in CAN/LIN communication to SRS module (if sensor uses networked reporting)

Diagnostic algorithm

  1. Safety first: follow manufacturer SRS disabling procedures before probing connectors (disconnect battery negative and wait the specified time)
  2. Retrieve and record DTCs and freeze frame data with a capable scan tool; note seat position and any related codes
  3. Perform visual inspection under seat: look for pinched wiring, connector corrosion, water staining, aftermarket items, damaged sensor mat
  4. Reconnect battery per procedure; with scan tool view live data for occupant classification sensor while backprobing the sensor connector. Observe signal with seat empty and with a known test weight (per service manual).
  5. Wiggle test harness and seat while watching live data for intermittent changes. If data drops or DTCs change, suspect wiring/connector movement fault.
  6. With ignition off and battery disconnected (per procedure), check continuity and resistance of sensor circuit between the sensor connector and SRS module connector. Repair open or high resistance circuits.
  7. If wiring and connectors are good, bench/replace the occupant classification sensor mat or sensor per OEM procedure. Do not modify or cut mat wiring. After replacement, ensure connectors and routing match OEM.
  8. If new sensor/mat installed and fault persists, check SRS/airbag control module for internal fault or require reflashing/configuration; verify module is programmed for vehicle and seat option.
  9. After repair, clear codes and perform system verification including occupant detection tests and confirm SRS lamp extinguishes and no related codes return.
  10. If repairs involve seat removal or replacing SRS components, follow all safety and disposal procedures for pyrotechnic devices and restraints.

Likely causes

  • Wiring harness pin pushed out or broken at the seat connector
  • Corrosion or water ingress in the sensor mating connector
  • Broken traces or damaged sensing elements inside the occupant classification mat
  • Connector tabs damaged after seat removal or service
  • Loose ground under seat or in body harness

Fault status

⚠️ Status
SRS control module detected occupant classification sensor circuit malfunction (open/short/high resistance or intermittent). System may disable or alter passenger airbag deployment logic until fault is corrected.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5-2.0 hours

Similar codes

B2950 B2951 B2953 B1622 B1234
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