Enabling BMW Bowers & Wilkins / Harman Kardon Sound System (G20)
How to unlock the Bowers & Wilkins sound profile and equalizer in a BMW G20 for richer audio with OBDThink. Step-by-step module paths and HK tip.
— Tekin Code
What Does This Coding Do?
By raising the audio processing profile to a higher level (alev4), it unlocks additional equalizer and soundstage options (such as concert, stadium, cinema). This can noticeably improve body, presence, and clarity of the sound.
Requirements
• OBDThink app
• OBD adapter or ENET cable
• BMW G20 / G21 (HiFi or Harman Kardon equipment)
Step-by-Step Coding
Basic Method (Head Unit – HU_MGU)
• Find 3002 Audio Broadcast > Audio System parameter.
• Change the value from **alev3-Ram** to **alev4-Ram**.
Tip for Harman Kardon (HK) Systems
If you have HK equipment, you can apply the B&W profile as follows:
- HIGH_END_AUDIO_B_UND_W → **volle_insz**
- AUDIO_SYSTEM → **alev4_ram**
- After coding, configure the new equalizer options from the iDrive audio menu.
Verification
Turn the ignition off and back on; in iDrive > Audio settings you will see the new equalizer/soundstage options appear.
Common Issues
- Sound seems unchanged: Manually readjust the iDrive equalizer settings to get full benefit from the new profile.
- Options did not appear: May be wrong parameter or incompatible equipment; revert to original value and try again.
Warnings
Results vary depending on your equipment level. Modifications are your own responsibility; note the current value before making changes.
Conclusion
With a few parameters you can achieve a noticeable improvement from your sound system. Upgrade the profile with OBDThink and tune the equalizer to your taste.
Frequently Asked Questions
Does it work with standard speakers?
The effect depends on the equipment; the difference is more noticeable with HiFi/HK systems.
Can it damage the speakers?
Profile changes are between BMW's own software levels so the risk is low; still, avoid excessively high volume levels.