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

B0312

Driver Seat Forward/Back Switch Circuit

The seat module has detected a fault in the fore/aft adjustment switch on the driver seat. Manual adjustment of the seat position may be limited or not work at all.

SystemBody
Typegeneric / SAE
GroupB0
Range / number3 / 12

Possible causes

  • Seat adjustment switch failed high
  • Wiring or connector fault medium

Symptoms

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

Inspection / repair

  • Difficulty: medium
  • DIY: possible
  • Estimated cost: 50–400 €
  • Estimated time: 0.5–2 h
  • Component: seat adjust switch
  • Component: seat 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