WSS (Weight Sensing System)SRS : Meaning, Symptoms, and Diagnosis

WSS stands for Weight Sensing System. It is a safety system used in the passenger seat to detect occupant weight and position. The information is used by the SRS control module to adjust airbag deployment strategy.

What Is a Weight Sensing System (WSS)?

The Weight Sensing System uses sensors installed inside the passenger seat to measure the occupant's weight. The system helps determine whether the passenger airbag should be enabled, disabled, or adjusted according to the detected condition.

How Does WSS Work?

WSS Signal Flow:

Seat Weight Sensor
↓
Occupant Classification Module
↓
SRS Control Module
↓
Passenger Air Bag Decision

Common Symptoms of WSS Fault

• Airbag warning light ON
• Passenger airbag OFF indicator incorrect
• Occupant detection system fault message
• Stored SRS B-codes
• Passenger airbag may be disabled

Common Causes of WSS Failure

• Faulty seat weight sensor
• Damaged wiring under the passenger seat
• Loose seat connectors
• Seat replacement without calibration
• Faulty occupant classification module

How to Diagnose WSS Problems?

WSS faults require an SRS-capable diagnostic scanner. The scanner can display occupant data, sensor values, and stored fault codes.

Diagnostic Path:

OBD-II Connector
↓
SRS Diagnostic Scanner
↓
SRS Module
↓
WSS Data & Fault Identification

Important Note About Abbreviations

WSS can have different meanings in automotive systems. It may refer to Weight Sensing System or Wheel Speed Sensor depending on the vehicle and diagnostic software. Always confirm the abbreviation using a professional scan tool and vehicle information.