Car Electronics Questions? Ask an Electronics Expert for Answers ASAP
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1. the warning screen cannot be disabled.
2. to turn on all speakers for CarPlay, change the bluetooth streaming defauly from front speakers to all speakers: go to System - Bluetooth Setup - Bluetooth HF/Audio and set to All.
I think the warning is a legal requirement, at least in some countries - cars may have different drivers from one day to the next, so the warning must always be displayed to cover their a$$!
But do get in touch with them and see if they have any workaround for it.