Audi’s entire radio and navigation system is built on the Audi MMI platform. It encompasses a number of handy electronic features including phone calling, Bluetooth connectivity, and satellite radio. The entire system is connected by fiber optic cabling. It’s absolutely beautiful when it works — until it doesn’t. Then you’re lost with no music or way to call someone from the Bluetooth. It’s like being back in the 1970s again.
Here’s how to troubleshoot repair problems with Audi’s MMI platform.
For starters, does the MMI start at all? If it doesn’t, the system probably isn’t receiving power. Your first step should be to check the fuse.
Many of the fuses that control the MMI module are located in a compartment in the left side of your trunk. Open the side panel and take a look at the fuses. Check them with a multimeter to see if any are burned out. Don’t have a multimeter? Take out each fuse, one by one, and see if the connected thread is broke.
Next, check the amp. Since the entire system runs on a loop, if a module stops working, the whole thing breaks down. And the amp itself is positioned in such a way to be a likely problem. Even leaked washer fluid or rainwater can ruin an amp. Check your trunk for any leaks. If your amp was destroyed by a leak, it will need replaced, unfortunately. Regardless, you should fix the leak or risk blowing another amp again.
Check Each Module, One by One
Next, check the other modules, one by one. Check the modules with a fiber optic bypass loop. Unplug the fiber optic plug going to the module and then plug in the fiber optic bypass loop to the plug to bypass the module. If the system begins working when you’ve bypassed a module, bravo! You’ve found the culprit.
Inspect the one inside the glove box by releasing the CD changer. Other modules can be found in the same trunk compartment you found the fuses.
Keep in mind that the button panel on the center console also works as a module. Spilled drinks, food, and kids can wreak havoc on these buttons. You could try cleaning it, but if the buttons are so bad the module is ruined, it’s likely a lost cause. The console will need replaced.
Last but Not Least
We saved the best for last. If you still haven’t found the solution, chances are you need to replace the main module. This baby’s expensive and will need to be swapped out and reprogrammed by an electrical specialist.