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

B0800

Headlamp Switch Circuit

A fault has been detected in the headlamp switch circuit. Light functions may not switch properly.

SystemBody
Typegeneric / SAE
GroupB0
Range / number8 / 00

Possible causes

  • Headlamp switch internal failure high
  • Loose switch connector medium

Symptoms

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

Inspection / repair

  • Difficulty: medium
  • DIY: possible
  • Estimated cost: 60–300 €
  • Estimated time: 0.5–2 h
  • Component: headlamp switch
  • Component: body control module

Sources

References

sae:J2012

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