OBD-II reference

All 9.533 generic OBD-II codes, explained in detail.

Causes, inspection steps and sources — a comprehensive DIY archive. Created and maintained with love for the detail. Good luck and have fun!

Body generic / SAE

B0081

Front Passenger Belt Switch Circuit

The SRS or body control module has detected a fault in the front passenger seat belt buckle switch circuit. The switch reports whether the belt is fastened and is used for the belt warning lamp and for restraint logic.

SystemBody
Typegeneric / SAE
GroupB0
Range / number– / 81

Possible causes

  • Buckle switch failed or stuck high
  • Wiring under seat damaged medium

Symptoms

  • Warning light or symbol related to the affected system
  • Comfort or safety function impaired

Inspection / repair

  • Difficulty: medium
  • DIY: possible
  • Estimated cost: 80–400 €
  • Estimated time: 0.5–2 h
  • Component: belt buckle switch
  • Component: srs control module
  • Component: body control module

Sources

References

How to read OBD-II codes

The first letter names the vehicle system, the second digit distinguishes generic from manufacturer-specific, the remaining digits group fault area and number.

PPowertrain: engine, transmission, emissions
BBody: chassis trim, comfort, interior
CChassis: suspension, brakes, steering
UNetwork: CAN, control modules, communication