Updated: 14.11.2025 (content)
The Audi RMC system (also known as Cnct Nav or Nav Plus) is a radio-navigation unit fitted in Audi A1, Q3 and A6 C7 models. Unfortunately, owners of these vehicles regularly report problems with a faulty infotainment system. If your Audi RMC does not switch on, freezes on the logo or keeps resetting all the time – there is a solution.
The problem is common, and the solution is hard to find. Most electronics workshops refuse to accept RMC for repair, citing the lack of a specialist test environment. Car workshops offer only replacement with a used unit, which involves high costs – not only for the module itself, but also for the necessary adaptation to the vehicle.
At OEMATIC we specialise in repairing all Audi RMC versions. Our refurbished units work without the need for additional coding to the car, which significantly reduces repair costs and time.
How do you identify the Audi RMC radio-navigation?
Identifying the RMC system in your Audi is easy and takes literally a minute. There are two proven ways to check it.
Method 1: Check via the system menu (the easiest)
If your unit is still working:
- Go to the system settings menu
- Select “System information”
- Read the software version
If the version name starts with “RMC_”, you can be sure that Audi RMC is installed in your car.
Method 2: Checking by part number
If the system is damaged and you cannot access the menu, the next step is a physical check of the part number. This requires removing the unit:
- Pull the unit out of the centre console (use radio removal keys)
- Check the top of the casing – you will find the rating label there
- Read the part number (part number) – it is printed in a larger font
Below you will find a complete list of part numbers for individual Audi models.
RMC part numbers – models for Audi A6 C7
4G0035180G, 4G0035180H, 4G0035180P, 4G0035180Q, 4G0035180R
4G0035182L, 4G0035182M, 4G0035182P, 4G0035182Q, 4G0035182R
4G0035187, 4G0035187F, 4G0035187P, 4G0035187Q, 4G0035187R
4G0035188F, 4G0035188G, 4G0035188P, 4G0035188Q, 4G0035188R
4G0035190A, 4G0035190D, 4G0035190P, 4G0035190Q, 4G0035190R
4G0035192H, 4G0035192J, 4G0035192P, 4G0035192Q, 4G0035192R
4G0035193F, 4G0035193G, 4G0035193P, 4G0035193Q, 4G0035193R
4G1035180B, 4G1035180F, 4G1035182B, 4G1035182F, 4G1035187B
4G1035187F, 4G1035188B, 4G1035188F, 4G1035190B, 4G1035190F
4G1035192B, 4G1035192F, 4G1035193B, 4G1035193F
Part numbers for Audi Q3
8U0035180, 8U0035180D, 8U0035180P, 8U0035180Q, 8U0035180R
8U0035182, 8U0035182A, 8U0035182B, 8U0035182C, 8U0035182G
8U0035182P, 8U0035182Q, 8U0035182R, 8U0035183C, 8U0035183P
8U0035183Q, 8U0035183R, 8U0035185C, 8U0035185P, 8U0035185Q
8U0035185R, 8U0035187P, 8U0035187Q, 8U0035187R, 8U0035188C
8U0035188P, 8U0035188Q, 8U0035188R, 8U0035190P, 8U0035190Q
8U0035190R, 8U0035192, 8U0035192A, 8U0035192E, 8U0035192P
8U0035192Q, 8U0035192R, 8U0035193C, 8U0035193P, 8U0035193Q
8U0035193R, 8U1035180B, 8U1035180D, 8U1035182B, 8U1035182D
8U1035183B, 8U1035183D, 8U1035185B, 8U1035185D, 8U1035187B
8U1035187D, 8U1035188B, 8U1035188D, 8U1035190B, 8U1035190D
8U1035192B, 8U1035192D, 8U1035193B, 8U1035193D, 8U2035182B
8U2035182D, 8UD035182, 8UD035182B, 8UD035182P, 8UD035182Q
8UD035182R
RMC versions fitted in Audi A1
8X0035180G, 8X0035180H, 8X0035180P, 8X0035180Q, 8X0035180R
8X0035182K, 8X0035182L, 8X0035182P, 8X0035182Q, 8X0035182R
8X0035183F, 8X0035183G, 8X0035183P, 8X0035183Q, 8X0035183R
8X0035185F, 8X0035185G, 8X0035185P, 8X0035185Q, 8X0035185R
8X0035188F, 8X0035188G, 8X0035188P, 8X0035188Q, 8X0035188R
8X0035192H, 8X0035192J, 8X0035192P, 8X0035192Q, 8X0035192R
8X0035193F, 8X0035193G, 8X0035193P, 8X0035193Q, 8X0035193R
8X1035182B, 8X1035182P, 8X1035182Q, 8X1035182R, 8XA035180B
8XA035180F, 8XA035182B, 8XA035182F, 8XA035183B, 8XA035183F
8XA035185B, 8XA035185F, 8XA035188B, 8XA035188F, 8XA035192B
8XA035192F, 8XA035193B, 8XA035193F, 8XB035182B, 8XB035182D
8XD035182
3 most common Audi RMC faults – causes and symptoms
Our regular repairs of Audi RMC central units allow us to pinpoint the problems that recur most often. Thanks to a properly designed diagnostic harness, we can not only verify the fault on the bench, but also thoroughly test all components and carry out full RMC diagnostics after the repair.
In every case our repair method is the same – we begin by verifying the fault under controlled workshop conditions, which guarantees an effective and long-lasting refurbishment.
1. Audi RMC navigation does not switch on at all
Fault symptoms:
- No response to the power button (neither manually nor after turning on the ignition)
- Complete lack of backlighting on the screen and buttons
- Silence from the speakers – the audio system does not work
- No signs of life from the unit
Most common causes:
This problem can have two possible sources – software or hardware. Unfortunately, there is no single universal rule here, which means diagnosis requires professional equipment.
Software cause: Damage to the flash memory storing the system software. In this case, the processor cannot start the operating system, so the RMC remains “dead”.
Hardware cause: Short circuits and voltage surges in the electronic circuits, most often caused by improper jump-starting from a battery booster. Voltage spikes can permanently damage the navigation’s sensitive electronic components.
Why is a booster dangerous for the RMC? Electronic devices in Audi are designed to operate at a stable 12V. Boosters can generate temporary voltage spikes, which can burn out electronic components in the RMC unit.
2. The radio-navigation freezes on the Audi start-up logo
Fault symptoms:
- After turning the ignition or pressing the power button, the Audi logo appears
- The system stops on the welcome screen and does not respond any further
- No button combinations (reset attempts, factory reset) help
- Even disconnecting the power and reconnecting the battery does not solve the problem
- The system menu never appears
Most common cause:
In the vast majority of cases the culprit is a hardware fault in the memory storing the software (usually NAND Flash memory). A damaged memory chip prevents the operating system from loading fully.
How the fault develops: During startup, the processor attempts to read data from flash memory. If certain memory sectors are damaged, the software cannot be executed properly and the system freezes halfway through the boot procedure – hence the logo freeze.
What is actually happening inside? Imagine the system trying to read the instruction “how to start up”, but the pages in the instruction book are torn or illegible. The system starts reading, reaches the damaged section and… stops, not knowing what to do next.
3. The Audi RMC system keeps resetting in a loop (boot loop)
Fault symptoms:
- The RMC unit powers up and shows the Audi logo
- After a few seconds or a few dozen seconds, the screen goes off
- The system automatically restarts and the cycle repeats
- No access to the menu or any functions
- The problem occurs in a loop (the so-called boot loop) – the system cannot move on
Most common causes:
This type of fault usually points to a hardware-software conflict. This may be:
- Partially damaged system memory (the system loads, but detects an error and restarts)
- Voltage surges in the processor power supply circuit
- A faulty capacitor in the power management section (voltage stabilisation for the processor)
- Corroded connectors or problems with BGA solder joints on the main board
Why does the system keep restarting? Modern electronic systems have built-in watchdog mechanisms – if the processor detects that something is wrong (for example, it cannot read critical data), it automatically forces a restart in the hope that the next attempt will succeed. Unfortunately, if the problem is hardware-related, the restart loop goes on indefinitely.
What versions of RMC does Delphi produce? Radio or navigation?
This question often surprises Audi owners, but it is key to diagnosis and repair. Audi RMC produced by Delphi comes in two functional variants, despite the front panel looking identical.
Two functional versions of RMC:
Version 1: RMC radio (without navigation)
- Audio player function (FM/AM radio, CD, Bluetooth)
- NO GPS module and no navigation function
- Lower purchase price when buying new/used
- No possibility of software activation of navigation
Version 2: RMC navigation radio (full functionality)
- All the functions of the basic version
- Built-in GPS module and navigation software
- SD Map support possible (depending on the software version)
- Higher purchase cost
How do I check which version I have?
There is a simple way to check – see whether your RMC has a GPS antenna socket.
Location of the GPS socket:
- After removing the unit from the dashboard, check the back of the housing
- The GPS socket is a small, round Fakra-type connector (usually blue or black)
- It is located next to the other audio and power connectors
If the GPS socket is present – you have the navigation version (even if the function does not work or is software-disabled).
If there is no GPS socket – you have the radio-only version, which will never be able to provide navigation.
Warning! Navigation may be software-disabled
It happens that the GPS module is physically fitted, but the navigation function is software-blocked. This happens in the case of:
- Cars from markets where navigation was a paid option (not chosen by the first owner)
- Units replaced under warranty repair (the dealer fitted software without navigation)
- Cars imported from countries where the equipment configuration was different
In such cases, activating navigation may require a software update and the unit being coded correctly.
Why is it worth repairing Audi RMC instead of replacing it?
Many Audi owners wonder whether it is worth refurbishing a damaged RMC unit or whether it is better to buy a used one and code it. Here are the key arguments for a professional repair:
Cost savings
- The repair cost is usually 40-60% of the price of a used RMC
- No extra coding costs (our repairs do not require adaptation)
- You avoid the risk of buying another faulty unit from the used market
Quality assured
- Refurbishment at a specialist workshop = full diagnosis of all components
- Replacement of all damaged components with new ones
- Functional testing under conditions similar to those in the car
- Warranty on the service performed
Originality preserved
- You keep the original unit matched to your VIN
- No risk of coding and compatibility issues
- Preservation of the vehicle's original settings and configuration
Would you like to see what our mail-in repair procedure looks like?
Summary – Audi RMC can be repaired effectively
Audi RMC faults affect many owners of A1, Q3 and A6 C7 models. The three most common problems – no power-up, freezing on the logo and constant resetting – are usually caused by damaged electronic components, mainly flash memory or power supply circuits.
Key information to remember:
- Most RMC faults are hardware-related and require professional refurbishment
- Replacing it with a used unit is a last resort, carries risk and often means higher costs (unit + coding)
- Specialist repair is a durable solution with a warranty and no need for coding
- Avoid using boosters – they are the main cause of surges that damage electronics
At OEMatic we have specialist diagnostic equipment and many years of experience in repairing Audi RMC systems. Every unit is tested on a dedicated workshop test bench, which guarantees full functionality after repair. Contact us if your RMC needs professional refurbishment.
Technical sources and documentation:
Detailed information on the pinouts, pins and connectors of RMC systems can be found in Audi service documentation.
