Audi MMI System

It is most important to perform diagnosis to find the exact point of failure

MMI system is formed up by a severa components linked by a fiber optic ring. When any equipment on ring fails except the headunit (J794), the system is not operational just flashes MMI logo on screen.

Therefore a ring break dignosis is required to determine the equipment in question. If diagnostic software (such as VCDS) is not available, a fiber optic loop can be used to bypass each equipment one by one until a bad one is found.

Below is list of equipments and associated symptoms when fail:

• Can-bus gateway (J522): this is the interfacing point of the whole MMI system to the car. it allows MMI system to turn off when ignition is off and wake up when door opens
• headunit (J794): controls operation of the whole system. In MMI3G/3G+ this also includes built-in navigation on HDD and Bluetooth. Therefore when there's problem with navigation or phone, it should points to the headunit. headunit problems also include crashing/restarting while running or totally dead.
• Display screen (J685): this hardly fails and the only paractical way to check is to plug in a known good display
• MMI Controller (E380): acts as a keyboard to a computer, susceptible to liquid spills from cup holder. Symptoms include sticky buttons, eratic jumping of menu and volume
• Radio module (R), with internal amplifier: this proven to be the most common point of failure due to water damage, trigerring the system to shutdown after flashing logo on screen
• Premium amplifier (J525): in cars with Bose / B&O sound system this is also the most common fails due to water damage, trigerring the system to shutdown after flashing logo on screen
• Navigaion Unit (Only MMI2G): running navigation from DVD, when fails also triggers the system to shutdown after flashing logo on screen
• Telephone Unit (Only MMI2G): provide Bluetooth handsfree, when fails also triggers the system to shutdown after flashing logo on screen

Headunit and Radio Module are Component Protected, replacement requires to be CP-removed with dealer's tool.

We provide transfer of CP information from original (faulty) equipment to our replacement ensuring plug and play experience.

Audi RMC radio

All-in-One Radio Headunit with separate Display Screen

Fitted in some A1, Q3 and A6 as lower option to MMI. The headunit includes tuner, CD player, Bluetooth and inetrnal amplifier.

Navigation is running on SD card, however is not provisioned in most Australian cars.

We do supply of unlocked RMC headunits that are plug and play without restriction of Component Protection.