Mercedes won't connect Bluetooth with iOS9

This won't help much other than possibly narrowing down the cause. I have a 2011 C350 and 2015 ML350 and upgraded my iPhone 5s to iOS 9.0.1 and have had no problem with either car. Possibly the issue is confined to/related to the iPhone 6?

This is a common thing with iOS 9. It has happened before with other iOS releases but it's more prevalent now. I've seen posts about VW, BMW, Subaru, Ford, Chevy (specifically Volt), Kia, GM, and there are probably others. What needs to happen is for the vehicle manufacturer or the head unit supplier needs to release an update to their system. Apple releases beta versions of their new iOS months before final release to the public. During that time, manufacturers and developers are expected to update their systems/software to work with the changes. If the manufacturer decides not to do this then there is little to nothing that the end user can do about it. They can talk to the manufacturer and urge them to release updates to their system. But based on other posts and stories I've read, most manufacturers seem very unwilling to work on developing or changing their systems on older vehicles and focus only on new systems.

FoxFifth wrote:

That may be but I have never had any updates on my 2011 C350 and it has worked with no issues with an iPhone 4 and later a 5s with iOS 5,6,7,8 and now 9.

Yeah, it doesn't affect everyone, every manufacturer, or every head unit. Someone that may never have a problem may upgrade to iOS 12 someday and suddenly it won't work anymore. Apple will tell you to contact the car manufacturer every time.

You can also add my '14 Porsche Carrera with the Bose system to the list. I never had any issues with my iPhone 5s or 6 with the time appropriate iOS. Now, iOS 9.0.1 with the iPhone 6 and 6s refuses to connect via Bluetooth.

Yep! Same problem here when trying to connect my iPhone 6 Plus to my 2014 Mercedes e250 coupe! Phone will connect to telephone audio but wont establish a connection when trying to connect to Bluetooth audio for music streaming. Had no problems with ios8 at all

Same issue. 2015 MB GLA45 AMG. iPhone 6 running iOS 9.0.1. Connects to the Mercedes bluetooth, but disconnects on answering a call. Mercedes has no work around.

That may be but I have never had any updates on my 2011 C350 and it has worked with no issues with an iPhone 4 and later a 5s with iOS 5,6,7,8 and now 9.

IO ho avuto lo stesso problema e mi sono accorta che un'applicazione "beurer" entrava in conflitto con bluethoot mb System .

l'ho disinstallata,e si è risolto il problema

IO credo che ci sia qualche app che entra in conflitto con il sistema,ma quale?