Microphone Not Working on Calls? Clear Every Bluetooth Pairing

1. Unplug the box so the head unit lets go of it.
2. On your phone, open Settings → Bluetooth and forget every entry that belongs to the box or the car: the box’s own name, AutoKit, the car, and anything else that looks related. Watches and headphones can stay.
3. In the head unit’s Bluetooth menu, delete every paired phone.
4. Plug the box back in, open its Settings → Bluetooth and forget every device listed there.
5. Restart the head unit properly. Switching the ignition off and on is not always a restart; on many cars you hold the power or mute button for 10–15 seconds. Your car’s manual has the exact method.
6. Pair the phone with the box. Your phone should now show one pairing for the box and nothing else for this car.
7. Turn contact sharing back on for that pairing so names appear on the screen, then make a test call.

The owner who first posted this fix on a Carlinkit TBox Ambient said the problem came back twice in a year, after box updates or restarts, and that repeating the clean-up fixed it each time. On a Changan UNI-S, clearing only the phone kept the microphone working for half a day; another UNI-S owner got a lasting fix only after also clearing the head unit and the box and restarting the head unit.

It did not help everyone. A Jaecoo J7 owner, a Hyundai Staria owner whose microphone worked for one or two calls and then dropped, and one other owner whose fix did not hold all reported back without success. If that matches you, continue with Fix 2 and Fix 3, which address a different cause.

1. Open the Google app on the box → Settings → Voice → Hey Google & Voice Match and turn the wake phrase off. Menu names vary a little between versions.
2. Open your navigation app’s settings, find its voice assistant section and turn off voice activation (the wake phrase). Leave the assistant itself on if you use it with a button.
3. Check any other app that answers to a spoken phrase and turn that off too.
4. Restart the box and make a test call.

One TBox Ambient owner noticed the clue first: callers could not hear them, yet the assistant still took commands. The “Hey Google” listener was holding the microphone, and calls worked as soon as it was off. A UX999 Rocket owner found that the navigation app had switched its voice activation back on by itself after a settings sync, even though they had turned it off before.

Recheck these switches after app updates. The same setting is behind most crackling and muffled sound reports, so this fix often clears both problems.

1. On the box, open Settings → Apps → Permission manager → Microphone.
2. Set every app to Don’t allow, except the phone / Bluetooth dialer app.
3. Restart the box.
4. Make a test call.

Two owners with a TBox Ambient in Changan cars got calls working this way; one also updated to the latest firmware first, after about a month of trying other things. The trade-off is that your assistant and navigation voice search stop hearing you until you allow the microphone for them again.

One of the two reported a few days later that the microphone had dropped out again. If that happens, repeat Fix 1, then this fix, in that order.

1. Open Settings → Apps → AutoKit (or the app’s own settings) and turn off its automatic start.
2. Make and answer calls through the box’s Bluetooth phone app instead.
3. Restart the box and test a call.

One owner in the Carlinkit TBox family found that the microphone went silent every time AutoKit launched, for calls and for the navigation app’s voice search alike. With AutoKit no longer starting on its own, calls through the Bluetooth app kept working.