Why is there no sound when playing music via Bluetooth in the car?

[SanPiper]

Reasons and solutions for no sound when connected to car Bluetooth: Volume not turned on: The volume on the car navigation system or phone is not turned on. Solution: Go to the phone's "Settings" — "Sound", find the "Media" option, and turn up the "Media" volume. The same applies to the car navigation system. Incompatible pairing code: The music playback programming of some phones (e.g., iPhone) is incompatible with the pairing code of certain car models, so calls can be made but music cannot be played. Solution: Try switching the Bluetooth playback frequency band to resolve the issue. Media audio not turned off: If the media audio on the phone is not turned off, it may cause signal interference with the Bluetooth function. Solution: Turn off the media audio while keeping the phone audio on. This ensures that the three functions—Bluetooth calls, car music playback (or radio), and phone navigation announcements—do not interfere with each other.