Have you noticed that your CarPlay or Android Auto navigation loses sound when you turn on the original BMW FM/AM radio? Or perhaps your music from CarPlay stops playing when you switch to the factory radio?
This is a very common scenario for BMW owners after upgrading their screens. While it might seem like a bug, it is actually a characteristic of how the BMW audio system operates. Below, we explain why this happens and provide easy solutions to help you enjoy both radio and smart connectivity.
Why Does Carplay Navigation Mute When FM Radio Is On?
The root cause of this issue is the single audio output channel limitation inherent to the original BMW iDrive system.
In a BMW, the audio system can only process and output sound from one source at a time.
- The original car radio (FM/AM/CD) occupies one audio channel.
- The PEMP screen (and therefore CarPlay/Android Auto) outputs sound through a different channel (usually the AUX or Bluetooth channel).
Because the car's system cannot merge two different audio channels simultaneously, when you switch to the original car radio to listen to a broadcast, the system automatically mutes the AUX/Bluetooth channel. Consequently, you lose the sound from your CarPlay or Android Auto, including navigation voice prompts, music, or incoming call ringtones.
Please note: This is a limitation of the BMW factory design logic, not a malfunction or defect of your PEMP screen.
How to Fix the No Sound Issue: 2 Practical Solutions
We understand how frustrating it is to miss a navigation turn just because you wanted to listen to the morning news. To solve this, we recommend the following two workarounds:
Solution 1: Use Internet Radio Apps Within CarPlay / Android Auto (Highly Recommended)
The most seamless way to enjoy radio and navigation simultaneously is to bypass the BMW factory radio entirely and keep all audio within the CarPlay/Android Auto ecosystem.
- Download internet radio applications on your smartphone (such as TuneIn Radio, iHeartRadio, or SiriusXM).
- Open these apps directly on your PEMP screen via CarPlay or Android Auto.
- Ensure your BMW's audio source is set to AUX (or Bluetooth, depending on your setup).
The Result: Your radio broadcast and your navigation alerts (like Google Maps or Waze) are now processed through the same channel. The system will automatically lower the radio volume when a navigation prompt speaks, giving you a perfect driving experience.
Solution 2: Master the Audio Source Switch
If you strongly prefer the traditional FM radio over internet apps, you will need to manually switch audio sources.
- When you want to listen to the FM radio: Switch the car's media source to Radio. (You will not hear CarPlay navigation).
- When you need navigation guidance or want to use Spotify: Switch the car's media source back to AUX.
Tip: You can usually program one of the physical memory buttons (1-8) on your BMW center console as a shortcut to quickly switch between the Radio and AUX sources.
Frequently Asked Questions about BMW CarPlay Audio Setup
Q1: How Do I Make CarPlay My Default Audio Source?
To ensure you always hear your CarPlay or Android Auto audio, you must set your BMW’s original iDrive media source to AUX (or Bluetooth audio) before driving. The PEMP screen routes all its sound through this channel.
Q2: Can I Code My BMW to Play Both Radio and CarPlay Together?
No. The single-source limitation is a hardware and core system logic constraint of the original BMW head unit. It cannot be bypassed using BimmerCode or other coding software.
Q3: Will Installing a Different Screen Fix This?
No. Because the limitation lies within the original BMW amplifier and iDrive system, changing the aftermarket screen will not resolve this issue. The solutions provided above are the industry standards for this scenario.
Need Further Assistance?
If you have any questions about setting up the AUX channel or configuring your PEMP screen's audio, our technical support team is here to help!
- Email Us: service@pempcar.com
- WhatsApp Support: https://api.whatsapp.com/send/?phone=8613534110582&text&type=phone_number&app_absent=0
Jeeky
- Electronics Engineer
