Use this article if…
- Phone pairs but media / nav audio is silent, Bluetooth routing - not “won’t pair.”
- Pairing fails → Phone pairing. All sources silent → No audio from speakers.
Quick answer
Bluetooth that pairs but stays silent is often media audio toggled off on the phone profile or volume at zero on the phone while projection is fighting for audio. Turn media audio on and raise volume on both phone and MK4.
Problem
- Bluetooth pairs but music or nav audio is silent.
Symptoms
- Phone shows connected for calls/media, but music or Maps voice is silent.
- Or sound returns only while CarPlay/Android Auto is active, not on plain Bluetooth.
Cause
- Media audio (A2DP-style playback) disabled on the phone’s Bluetooth profile for the MK4.
- Phone or MK4 media volume at zero, or a focus / Do Not Disturb mode blocks playback.
- An active CarPlay or Android Auto session is claiming audio while plain Bluetooth looks connected.
- Edge-case Bluetooth stack or firmware mismatch between phone generation and MK4.
Fix Step-by-step
- On the phone, open Bluetooth → MK4 → ensure Media audio (Android) or equivalent is enabled.
- Disconnect CarPlay/Android Auto for the test - play a local MP3 via Bluetooth only.
- Raise volume on both phone and headunit; exit any focus mode that mutes media.
- Forget pairing on phone and MK4, reboot both, pair clean.
- If still silent on all sources, jump to No sound from speakers.
Notes
- Pairing fails: My phone won’t pair
- All sources silent: No sound from speakers
- Wireless projection: CarPlay disconnects, Android Auto not connecting, wireless guide
Still stuck? Send us these photos
- Phone: exact model and OS version (e.g. iOS or Android + release).
- Screenshot: Bluetooth device details for the MK4 on the phone - show Media audio / phone audio toggles (Android) or equivalent on iPhone.
- Confirm: FM or USB on the MK4 still plays normally while Bluetooth media stays silent.
- Screenshot (if available): MK4 Bluetooth paired-device screen during failed playback.
- Vehicle: model and year for logs context.