The situation where the Xiaomi smartphone displays the status of “Connected” to the car multimedia system, but the sound is not played, is a common technical anomaly. Often users see a notification about the connection, but the music tracks and navigation hints remain silent. This indicates the dissynchronization of Bluetooth profiles or conflict of priorities in the MIUI operating system.
The problem can be in the software failure of the head device itself (GI) and in the power saving settings of the smartphone. Android Auto and regular media transmission protocols sometimes misinterpret the handshake signal when connected, resulting in the control channel is active and the audio stream is blocked.
To restore functionality, you need to consistently check your Bluetooth profile settings, reset the multimedia services cache, and recheck the physical connection. USB-Let's take a look at the detailed steps to fix the malfunction.
Diagnostics of Bluetooth Profiles and Sound Priorities
The first step should always be to check active profiles in the Bluetooth menu.The smartphone can be paired with a tape recorder, but the profile is Multimedia Audio» (A2DP) It can be deactivated or malfunctioning. The system considers the device to be connected for calls (HFP), but blocks stereo transmission.
Go to your Xiaomi’s Bluetooth settings, find your radio (often called Car Kit, Android Auto or the GU model) in your connected device list, and click on the gear icon or arrow next to the name. Here, it’s important to make sure the switch opposite to Multimedia Audio is active.
- 🎧 Make sure that the Multimedia Audio slider is lit blue.
- 📞 Check if the “Use for Calls” tick is worth the detriment of music on old firmware.
- 🔄 Try disabling Contacts or Call History profile to reduce channel load.
If the switches are active but no sound, try forcefully resetting the connection. Press "Disable" or "Forget the device", then repair. This action clears temporary configuration files that may have been corrupted.
⚠️ Note: When re-conjugating, the radio may request confirmation of the access code. Make sure the car is standing still to enter the combination of numbers safely.
A common reason for silence is the Absolute Volume function, which, if it's on, synchronizes the volume control on the phone and the tape, sometimes causing one of the devices to "think" it's at zero, and turning it off in the developer menu or special features can solve the problem.
Setting up USB mode and debugging for Android Auto
If you’re using a wired connection via Android Auto or Mi Car, the problem often lies in the selected mode of operation. USB-By default, Xiaomi can choose Charge Only mode, which physically prevents audio data from being transmitted despite having an electrical contact.
To access hidden settings, activate the developer menu. Go to Settings → About Phone and quickly click 7-10 times on either MIUI Version or OS Version until the “You’ve become a developer” notification appears.
Once you activate the hidden menu, go to Advanced Settings → For Developers. Find the section related to the default USB configuration. You must select File Transfer (MTP) or Android Auto mode if this option is explicitly available.
☑️ Verification USB-settings
In the same developer menu, you should pay attention to the item “Switch off absolute volume.” Its activation (or deactivation, depending on the Android version) often helps to desynchronize volume levels that may have stuck at a minimum.
Check the physical cable, too. Cheap wires only charge (2 wires inside), but not data (requires 4 wires). Using a quality cable labeled with data is critical for stable multimedia.
Energy saving and background processes management
MIUI’s aggressive energy-saving policies often become an undetectable killer of audio streaming.The system can “freeze” an application of music or navigation as soon as the screen goes out or the phone connects to the car, considering it background activity.
You need to configure exceptions for key applications. Go to Settings → Battery and Performance → Application Management. Find your music player (Spotify, Yandex.Music, Google Music) and select No Limits mode.
- 🔋 Set the “No Limits” mode for media services.
- 🔒 Block the application in the menu of running tasks (swig down) so that it does not unload.
- 🛡️ Turn off “Mi Optimization” in the developer menu if the problem is systemic.
Special attention should be paid to auto-run. Some versions of the shell require manually allowing the application to start automatically, which ensures that when connected to the tape, the service will not wait for user intervention to start playing.
⚠️ Warning: Disabling battery optimization may result in increased battery consumption if the background application is not working properly.
If the problem persists, try clearing the cache of Bluetooth and Bluetooth MIDI Service. This is done through Settings → Apps → All Apps → Show system processes. A search for the word “Bluetooth” will help you find the services you need.
Comparison of Connection Methods and Compatibility
Different ways of connecting have different levels of reliability and resource requirements, and understanding the differences between wireless and wired connections helps to quickly locate the source of the problem.
| Connection method | Stability of audio | Sound delay | Requirements |
|---|---|---|---|
| USB Cable (Android Auto) | Tall. | Minimum | Quality cable, data transfer mode |
| Bluetooth A2DP | Medium | Medium | Stable profile, no interference |
| Wi-Fi Direct (Wireless AA) | Depends on the router. | Tall. | Support for 5 GHz, powerful processor |
| Aux cable | Analog | Absent. | 3.5 mm working connector |
As you can see from the table, wired USB connections typically provide the most stable audio stream without interruption, and wireless methods are susceptible to interference from other devices in the car interior or cell towers.
If the stereo only supports an old Bluetooth profile (e.g., version 2.1 or 3.0) and the phone uses modern codecs (aptX, LDAC), there may be a coding conflict, in which case the phone developer settings should try changing the Bluetooth codec to SBC or AAC, which are basic and supported by all devices.
Which Bluetooth codecs to try first?
Specifics of working with Android Auto and third-party GU
When using Android Auto, the situation is complicated by the fact that the audio control is intercepted by the intermediary app. If Android Auto itself fails, the phone can show the connection, but the audio channel will remain closed.
Try to clear the Android Auto app data. Go to the app settings, find Android Auto, and select Clear All Data, which will return the projection settings to factory settings, and then you'll need to reconfigure the car profile.
It often helps to update Google Play Services components. Make sure that the Play Market store has updates for all Google services, and it’s also worth checking the version of the Android Auto app itself – beta versions may contain bugs.
- 🚗 Remove the car profile from Android Auto settings.
- 🗑️ Clear the cache and data of the Android Auto app on your phone.
- 📡 Check Wi-Fi and Bluetooth (they must be enabled for wireless operation).
For Windows CE or older Android versions (4.4, 5.1), it is important to use the version of the mirroring app (e.g., Zlink, Tlink, EasyConnection) that is preinstalled on the head unit.
Hardware reasons and checking cables
The physical wear of the connectors is not to be discounted; the USB port in the car is constantly subjected to vibration, temperature changes and mechanical stress; contacts can become oxidized or loosened, resulting in loss of data lines while maintaining the power line.
Check if there is any dust or pile inside the USB port. Carefully clean the connector with compressed air or a wooden toothpick. Metal objects are not recommended to be used to avoid short circuits.
If you use adapters or extension cords, try to remove them from the chain. Every additional contact is a potential point of failure. Connect your phone directly to the standard port of the radio.
⚠️ Warning: Prolonged use of substandard cables can lead to voltage surges that can damage the smartphone's power controller.Use certified accessories.
In rare cases, the problem may be in the speaker or amplifier of the car, not in the phone. Check whether the tape recorder is playing sound from other sources (radio, built-in player from the flash drive). If there is no sound anywhere, the problem is in the car.
Resetting network settings as a radical method
If the software manipulations don’t work, it’s left to reset the network settings, which will remove all stored Wi-Fi networks, Bluetooth pairs, and mobile network settings, returning them to factory status.
To do this, go to Settings → Connection & Sharing → Reset Wi-Fi, mobile networks and Bluetooth. Confirm action. Once rebooted, the phone will be “clean” in terms of network connections, which often eliminates deep system conflicts.
Once reset, pair the tape with the tape, create new configuration files that are free of previous session errors, and this is the most effective way to deal with the bugs of communication protocols.
💡
Network resets are a secure procedure that does not affect your personal files, contacts or photos, but requires re-entering passwords from Wi-Fi.
Remember that after reset, you need to re-authorize in all applications using the network, and re-connect the smartwatch or trackers, if they were paired.