Check Bluetooth pairing and phone permissions, then test one parked call with one connected phone. Change one variable at a time and keep the original data or settings safe.
Use normal shutdown procedures, keep hardware dry and stop if you see damage, overheating, burning smells or any electrical risk.
Checks to perform in the right order
Confirm the exact symptom
Separate a call that is not shown, one that will not answer and audio that stays on the phone.
Check the relevant setup
Check Bluetooth, phone permissions and the phone-call profile.
Run one controlled test
Restart the phone and head unit and test one short call with one phone paired.
Compare the result
Repeat the test with one compatible cable, account, network or accessory changed. A controlled comparison shows whether the fault follows the device or the environment.
Escalate with evidence
Record the exact model, software version, warning and result of each safe check. Use the manufacturer's support page before deleting data or opening hardware.
How to narrow down the cause
- A change after one controlled test is a useful clue; keep the other variables unchanged.
- If a second compatible device works in the same setup, focus on the first device rather than replacing everything.
- Stop if there is heat, liquid, physical damage, burning smell or electrical risk.
Official sources used
Procedures can vary by model, firmware or hardware revision. When your device differs, use the official manufacturer documentation for that exact model.