Resetting the bulb warning light on a BMW E90 can be essential for maintaining the vehicle's functionality and ensuring safety. This guide is designed for BMW E90 owners who are experiencing issues with their bulb warning light, whether it’s a false alarm or an actual bulb failure.

Understanding the Bulb Warning Light

The bulb warning light illuminates when there is a malfunction in the vehicle's lighting system. This could be due to a burned-out bulb, a faulty connection, or an issue with the vehicle's control module. Owners typically seek to reset this warning light after confirming that all bulbs are functioning correctly.

Steps to Reset the Bulb Warning Light

Follow these steps to reset the bulb warning light:
  • Check All Bulbs: Before resetting, ensure that all exterior and interior bulbs are functioning properly. Replace any burned-out bulbs.

  • Access the On-Board Computer (OBC):

- Start by turning on the ignition without starting the engine.

- Locate the BC button on the end of the left-hand stalk (the turn signal lever).

  • Display Error Codes:

- Press and hold the BC button until you see a code displayed (CC-ID xxx). This indicates which bulb may be malfunctioning.

  • Reset the Warning Light:

- If all bulbs are confirmed to be working, hold down the BC button again until you see the warning light reset.

- Alternatively, some users have reported success by disconnecting and reconnecting the battery for a few minutes.

Additional Considerations

If the warning light persists despite checking all bulbs and resetting, consider these options:

  • Inspect Connections: Ensure that all bulb connections are secure and free from corrosion.

  • Check Control Module: The issue may lie within the vehicle's Footwell Module (FRM), which controls lighting functions. A reset of this module may be necessary.

  • Professional Diagnosis: If problems continue, it may be beneficial to consult a professional mechanic or use a diagnostic tool to check for error codes.

StepDescription
1Check all bulbs for functionality.
2Turn on ignition and access OBC.
3Press and hold BC button to display error codes.
4Reset warning light if all bulbs are functional.

FAQs About Resetting Bulb Warning Light on BMW E90

    • What if the warning light doesn't turn off?
      If the light remains illuminated after following reset steps, check for faulty connections or consider professional diagnostics.
    • Can I reset it without checking bulbs?
      It is recommended to check bulbs first to avoid unnecessary resets.
    • Is it safe to drive with the bulb warning light on?
      No, it's important to resolve any lighting issues before driving.

By following these steps and tips, BMW E90 owners can effectively manage their bulb warning lights and ensure their vehicle remains safe and operational.