If you have no sound or poor audio from your retrofit kit, follow these checks before contacting support.
1. Check Audio Source Selection
- If CarPlay/Android Auto shows but no sound is heard, check the BMW’s audio source:
- CCC systems → must be set to AUX.
- CIC, NBT, EVO systems → set to AUX if your car does not support Bluetooth audio streaming.
- If your BMW has Bluetooth audio streaming → ensure Phones Bluetooth (BMWo) is selected in iDrive.
⚠️ It is not possible to have BMW Radio/DAB playing at the same time as CarPlay or Android Auto audio. You must switch the audio source to AUX or Bluetooth for sound to work.
2. Check Bluetooth / AUX Setup
- On your phone, confirm it is paired for calls + audio (BMWo).
- If using AUX, ensure AUX is selected in iDrive and the volume is up.
- Test by playing music directly from your phone via AUX or Bluetooth to confirm audio works.
3. Check Fibre Optic & Audio Cables
- Cars with a MOST fibre optic system require the fibre loop to be connected correctly through the retrofit harness.
- Loose, damaged, or kinked fibre optic cables will result in no sound at all.
- Ensure fibre cables are fully clicked in.
4. Check DIP Switches / Settings
- DIP switches must match your system type (CCC, CIC, NBT, EVO).
- Wrong switch settings may cause no sound or distortion.
- Refer to your installation manual for the correct configuration.
5. Reset the System
- Turn off ignition, lock the car, and wait 5 minutes.
- Restart and re-test.
- If still no sound, hold the MMI box reset button for 10 seconds.
6. Common Sound Issues
- CarPlay shows but no sound → BMW audio source still set to Radio/DAB. Switch to AUX or Phones Bluetooth.
- Music works but calls silent → Phone not paired for both calls + audio.
- Distorted/weak sound → AUX volume low or wrong input selected.
- No sound at all → Check fibre optic loop, AUX setup, and DIP switches.
7. Next Step
If sound is still not working:
Send your order number, vehicle make, model, year, and a short video showing your screen and iDrive audio source to
support@bavarian-automotive.co.uk
Oct 2, 2025