B2083

Code

Generic B — Body

Front passenger seat weight sensor circuit malfunction

Brand: Generic

Type: B — Body

Views: UK: 10 EN: 10 RU: 13

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Page language: EN

Causes

Open or shorted wiring in the passenger seat weight sensor harness
Loose, corroded or damaged connector(s) at the seat or occupant classification module
Failed weight sensor mat or load cell in the passenger seat cushion
Faulty occupant classification/airbag control module (OCS/ACM) or seat module
Water/moisture intrusion or contamination in seat cushion or connector
Poor ground or blown fuse protecting the sensor circuit

Symptoms

Airbag warning light or SRS indicator illuminated on dash
Passenger airbag indicator showing incorrect status (ON/OFF) or not changing when seat occupied
Occupant classification system warning or service message in instrument cluster
DTC B2083 stored in SRS/OCS control module
Possible inability to arm/passenger airbag when the passenger is present

What to check

Read and record all stored SRS/OCS codes and freeze frame data with a capable scan tool
Verify presence of any related passenger airbag or seat sensor codes
Visually inspect passenger seat cushion, sensor mat and harness for damage, water, or contamination
Inspect connectors under the passenger seat and at the module for corrosion, bent pins, or loose terminals
Perform wiggle test on harness while monitoring live data/scan tool for intermittent changes
Check fuses and ground(s) related to SRS/OCS circuits

Signal parameters

Reference supply to sensor: typically a 5V reference or battery feed (verify service manual)
Signal output: expected 0–5 V analog (or module-specific scaled value) depending on manufacturer — unoccupied vs occupied ranges available in service data
Sensor resistance: seat mat/load-cell resistance or ohms reading will change when occupied — compare to specifications in manual
CAN/LIN: occupant classification module may publish passenger weight/occupancy messages on the vehicle bus — verify message presence and valid data
Continuity: low resistance between sensor ground and chassis ground; no short to power

Diagnostic algorithm

Connect a diagnostic scan tool, read and save all SRS/OCS codes and live data; record freeze frame conditions.
Confirm B2083 is current or historic and note any related codes; attempt to clear codes and see if B2083 returns.
Visually inspect the passenger seat cushion, sensor mat, connectors, and harness for damage, water, stains or foreign objects; inspect under-seat area.
With battery voltage present, backprobe the sensor connector and verify reference voltage, signal voltage, and ground per service manual. Monitor signal while seat is unoccupied and while applying weight (sit or use calibrated weight).
Check continuity and resistance of harness between the sensor connector and the occupant classification module; repair any open/shorted circuits.
Wiggle harness and connectors while watching live data to find intermittent faults.
If wiring and connectors are good, test or replace the passenger seat weight sensor mat or load-cell per service procedure. Some vehicles require seat module replacement or sensor mat swap for confirmation.
If sensor and harness test OK, inspect and test the occupant classification/airbag module power, grounds and communications (CAN/LIN); replace module only when supported by tests and after performing required calibrations.
After any repair or replacement, clear codes, perform required occupant classification system calibrations/learn procedures, and verify proper operation and that the code does not return.
Consult manufacturer service information and TSBs for known issues and exact test values before replacing major components.

Likely causes

Damaged wiring or connector at the passenger seat (most common)
Failed sensor mat/load cell under the passenger seat cushion
Corroded connector or presence of moisture in the seat harness
Fault in the occupant classification/airbag module or its power/ground supply

Fault status

⚠️ Status

Front passenger seat weight sensor circuit malfunction — Occupant classification system may not detect passenger correctly; airbag enable/disable may be affected.

🟡 Repair difficulty: Medium

⏱️ Diagnostic time: 1.0-2.5 hours