![]() Thanks to Nart Roustom for providing some of the images. NOTE: If you do a total reset, you’ll lose all your presets and memory for the radio, navigation, phone etc., so everything will need to be setup again from scratch. Go to SYSTEM SETTINGS and scroll down to RESET, as you can see in the photo below. If all these steps didn’t help and you’re still missing the Bluetooth Audio, here at, we recommend to reset the whole system entirely. Now you can exit from there, and at this point you should have BT Audio selection appeared under AUDIO menu. IMPORTANT: If both selections are turned on already, make sure to turn them off completely… and then turn them on again. It is caused by hardened oil cooler gaskets. This is a common oil leak source on all Mercedes engines. IMPORTANT: If both selections are turned on already, make sure to turn them off completely and then turn them. Oil leaking from oil cooler is a problem that affects 2007-present V6 diesel engines. There you’ll see 2 selections: BT Audio and Bluetooth as you can see in the photo below. There you’ll see 2 selections: “BT Audio” and “Bluetooth” as you can see in the photo below. Once you enter the engineering mode on the screen, scroll down to HU Parameter and enter. Once you enter the engineering mode on the screen, scroll down to “HU Parameter” and enter. ![]() The buttons are highlighted on the photo below: The 3 buttons to press together are: RED PHONE PICKUP button + “1” button + “#” button. In order to enter the system Engineering Mode, you have to press and hold 3 buttons for about 5-6 seconds until you see the Engineering Mode menu pops up on the screen. One of the menus in the AUDIO has to be “Bluetooth Audio”, but if you don’t see this menu on the screen (like on the photo below), then you need to enter the system Engineering Mode. Then go to AUDIO on the screen and select it. On your screen, go to SYSTEM and then to SYSTEM SETTINGS, then make sure that ACTIVATE BLUETOOTH box is selected. A lot of people contacted me with the same problem, so I decided to write an article with the solution to this problem, which will require to enter the Mercedes “Engineering mode”.įirst, you have to make sure that Bluetooth is active in your car. Get genuine OEM MERCEDES-BENZ S550 Radio Audio used parts from the biggest Used car range in North California. We can offer affordable replacement options. We have over 30 years experience in the car radio repair business and extensive work with Mercedes car radios and CD players. A 30 day warranty is given on these repairs. If you have a Mercedes-Benz model equipped with the Bluetooth Phone, but can’t find Bluetooth Audio – read this! “BT Audio” is designed for the streaming of audio from your phone, or any device compatible with a Bluetooth technology. Exchange your broken radio or CD player for a freshly renewed / rebuilt one with fast turnaround time through our repair program.
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