CleverPixel Posted July 17 Share Posted July 17 I own a right-hand drive European specification 2012 A5 with MM! 3G and a B&O amplifier. The issue is that the device powers up briefly and then shuts off, with the screen going black. I have disconnected the amplifier and tuner in the boot, and I have also had the amplifier inspected by a reputable business, which found no faults. If you remove the fibre optic cable from the head unit (the unit in the dashboard with the changer slot) and connect it to the screen, the screen will become functional and remain on. However, I am unable to locate where the media leads in the glove box connect to. They seem to disappear behind the passenger airbag. Is there a specific fibre optic unit that these leads should be plugged into, and if so, where can it be found? Additionally, could you provide information on the placement of the independent Bluetooth module? It seems that the problem is likely related to a fibre optic issue. Thank you. Link to comment Share on other sites More sharing options...
CleverPixel Posted July 17 Author Share Posted July 17 The drivers did not install the module. Link to comment Share on other sites More sharing options...
TraumaLaugh Posted July 17 Share Posted July 17 The reason for this is because Bluetooth is included into the MMI3G primary unit located in the centre instrument panel. The MMI3G High system has four modules that are interconnected by the MOST optical ring. These modules include the main unit (-J794-), the CAN Gateway (-J533-), the radio module (-R-), and the external amplifier (-J525-). If either the radio or the external amplifier malfunctions, the complete MMI3G system will cease to function, as you have described. The standard troubleshooting technique involves disconnecting certain modules (such as the radio, amp, and CAN Gateway) from the optical loop by using a "female" MOST bypass connection. Finally, the main unit is isolated from the loop using a "male" MOST bypass connector. The AMI port in the glovebox is directly linked to the main unit via the wire harness, hence there is no separate module located there. Link to comment Share on other sites More sharing options...
CleverPixel Posted July 17 Author Share Posted July 17 Excellent response------- Issue resolved; two defects identified and fixed. The radio module beneath the amp is experiencing a persistent power failure. Despite searching for a blown fuse, none have been found. The radio module itself may be the cause of the issue. After restoring power, the fuses blew due to the discovery of another constant source of electricity, which was connected to a fused spur. Thankfully, I immediately suspected the radio module or amplifier due to the presence of water traces. I purchased a replacement from Ebay, which resolved the issue. I hope this information proves useful to others. Link to comment Share on other sites More sharing options...
TraumaLaugh Posted July 17 Share Posted July 17 Water entering the trunk, often due to blocked rear sunroof drains or faulty trunk lid gaskets, may cause significant damage to the MMI system. Link to comment Share on other sites More sharing options...
CleverPixel Posted July 17 Author Share Posted July 17 The wire in question is a faulty fuse located in the 7.5 amp black area of the fuse box in the trunk. The issue has been resolved. Link to comment Share on other sites More sharing options...
NotePapa Posted July 17 Share Posted July 17 Congratulations, gentlemen. Sherlock Holmes would commend your work. Link to comment Share on other sites More sharing options...
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