Audi MMI, or Multi Media Interface, is an advanced infotainment system that allows drivers to access various features such as navigation, phone, radio, and music.
However, some Audi owners may encounter problems with their MMI not working properly.
This can be frustrating and inconvenient, especially if you rely on the MMI system for your daily driving needs.
In this article, we will explore some of the common causes and solutions for Audi MMI not working, and help you get the most out of your Audi technology.
How To Fix Audi MMI Not Working Issue?
#1. Reset the MMI
One of the simplest and most effective ways to fix a glitch or crashing MMI system is to perform a hard reset.
This can be done by pressing “setup,” the joystick, and the upper right button simultaneously to reboot the system.
This may resolve temporary issues caused by software errors or overheating.
#2. Replace the Blown Fuse
If your MMI display does not come on at all, it may be due to a blown fuse. The fuses that control many of the MMI modules are located in a compartment on the left side of your trunk.
You can use a multimeter to check the fuses and see if any of them are burned out. If you find a faulty fuse, replace it with a new one of the same rating.
#3. Check and replace the Amplifier
MMI might not work due to a damaged amplifier. The amplifier is located in the trunk compartment and is connected to the rest of the system by fiber optic cables.
These cables are very sensitive and can break easily if there is a single point of failure. One common scenario that can damage the amplifier is a leak from the rear window washer pipe.
This can cause water to drip onto the amplifier and short-circuit it. If you suspect that your amplifier has been affected by water or other factors, you should inspect it for any signs of damage.
If you need to replace the amplifier, you will also need to take your car to a dealership to have it reprogrammed into your system.
#4. Check the Other Modules
The MMI system consists of several modules that are located in different parts of your car. Some of these modules are behind the glove box, under the center console, or in the dashboard.
If some of your MMI functions are not working properly, you may need to check these modules for any faults or loose connections.
To access these modules, you will need to remove some screws and trim pieces using a T20 Torx screwdriver and a trim removal tool.
You can also use a fiber optic bypass loop to isolate and test each module individually.
Why is Audi MMI Screen Not Working?
1. A glitch or crash in the software that runs the MMI.
This can be fixed by doing a hard reset by pressing “setup,” the joystick, and the upper right button simultaneously to reboot the system.
2. A blown fuse prevents the MMI from receiving power.
This can be checked by inspecting the fuses in the trunk compartment and using a multimeter to test them.
3. Overheating of the MMI system due to extreme temperatures.
This can affect the display function and cause it to malfunction. Audi had to perform an update in 2011 to fix this issue for some models.
4. Water damage to the amplifier or other modules in the loop.
This can happen if the pipe for the rear window washer leaks onto the amplifier in the trunk or if there is moisture in the cabin.
This can require replacing the amplifier or the module and reprogramming it at a dealership.
5. A single point of failure on one of the fiber optic cables that connect the modules in the loop.
This can affect the entire system and make it non-functional. This can require replacing the entire MMI unit or finding out which cable is faulty.
What If Audi MMI Not Working After a Battery Change?
1. Reset the MMI system by pressing the power button and the big knob at the same time for about 10 seconds. This may reboot the MMI and restore its functionality.
2. Check the fuses for the MMI system and make sure they are not blown or loose. You can find the fuse box locations and diagrams in your owner’s manual or online.
3. Code the new battery using a VAG-COM or similar device.
This may help the car recognize the new battery and adjust its power management system accordingly. You can change the battery serial number by one digit in the BMS module.
4. Wait for the car to adapt to the new battery over time. This may take a while, but the car’s computer may learn the new power output from the battery and turn on the MMI system eventually.
5. If none of these methods work, you may have a faulty MMI screen or a wiring issue that requires professional diagnosis and repair. You can contact your local Audi dealer or a qualified mechanic for assistance.
How to replace or repair the MMI unit or its components?
To replace the MMI unit, you will need a trim tool, an 8mm socket, and a new MMI unit.
1 You will need to remove the lower and upper portions of the front panel, remove four 8mm bolts, and remove the old MMI unit.
2. You will need to install the new MMI unit and reattach the front panel.
3. You will need to take the car to a dealership to have the new MMI unit programmed to work with your car’s system.
4. To replace or repair other modules in the loop, such as the amplifier or the module behind the glove box, you will need to access them by removing some screws, panels, or components.
5. You will need to disconnect and reconnect the fiber optic cables carefully and avoid damaging them.
6. You will need to test the functionality of each module after replacing or repairing it.
Conclusion
The Audi MMI system is a great feature that enhances your driving experience. However, it can also malfunction due to various reasons.
If your MMI screen is not working, you should try to identify the cause and apply the appropriate solution.
If you are not confident or experienced in doing so, you should seek professional help from an authorized Audi dealer or mechanic. They can diagnose and repair your MMI system more efficiently and safely.
