Why is there no sound from the car Bluetooth speaker?

[DeHeidi]

There may be several reasons why a car Bluetooth speaker is connected but produces no sound: the volume on the car navigation system or mobile phone is not turned on, simply turn it on; some mobile phones (such as the iPhone) have music playback programming that is incompatible with the docking codes of certain car models, so they can only answer calls but not play music, requiring a change of the Bluetooth playback frequency band, etc. Below is an introduction to the car Bluetooth system: 1. Function: The car Bluetooth is an in-car wireless hands-free system designed and developed based on wireless Bluetooth technology. Its main function is to connect with a mobile phone via Bluetooth technology for hands-free calls while driving normally, achieving the purpose of freeing hands and reducing the risk of traffic accidents. 2. Principle: Bluetooth technology is an open global standard for wireless data and voice communication. Its essence is to establish a common radio air interface for the communication environment between fixed or mobile devices, further integrating communication technology with computer technology, enabling various 3C devices to communicate or operate with each other within a short range without the need for wires or cables to connect them.