2011-2017 Audi A5, Q5, A6 & More CD Changer: A Guide to Component Protection

Symptoms of a Failing CD Changer

When the glove box-mounted CD changer begins to fail in these Audi models, you'll likely notice several distinct symptoms. Because it's part of the integrated MMI system, a failure can sometimes cause confusing error messages.

• "Device Fault" or Similar MMI Error: The most common symptom is an error message on the MMI screen indicating a problem with the CD player.
• Failure to Load, Play, or Eject Discs: The unit may refuse to accept a CD, or it might accept it but fail to play it. You might hear mechanical whirring or clicking sounds as it tries and fails to operate. In other cases, it may not eject discs that are already inside.
• MMI Shows "CD Empty": Even with discs loaded, the MMI system may report that the changer is empty. This indicates a communication failure where the changer's mechanicals may work, but it cannot report its status to the MMI head unit.
• No Power or Blinking Lights: The lights on the front of the unit may not illuminate at all, or they may blink erratically, indicating an internal electronic or power-related fault.
• System Defaults to Another Source: When you select the CD changer as the audio source, the MMI might hesitate and then switch back to the radio or another media source.

Diagnosing the Issue

Before replacing the unit, a few simple checks can help confirm the CD changer is the culprit:

1. Try Different CDs: Test with several known-good, commercially produced audio CDs to rule out a problem with a specific scratched or burned disc.
2. Check Fuses: Locate and inspect the fuse for the CD changer or infotainment system. A blown fuse could cause a complete loss of power.
3. Perform an MMI Reset: A soft reset of the MMI system can sometimes clear up software glitches. The procedure varies slightly by model but typically involves pressing a combination of the SETUP, central control knob, and upper-right soft key simultaneously.
4. Visual Inspection: Check the electrical connector on the back of the unit for any signs of corrosion or loose pins.

The #1 Issue: Component Protection

The single most important factor when replacing this CD changer is Audi's anti-theft system, known as Component Protection (CP). Many electronic modules in the vehicle, including this CD changer, are electronically 'locked' to the car they were originally installed in.

When you install a used CD changer from another vehicle, it will power on, and you may be able to load and eject discs. However, it will not play audio. The MMI will display a message like "Component protection active," and the unit will be non-functional until the protection is removed.

How is Component Protection Removed?

Removing Component Protection is not a DIY task. It requires special diagnostic tools (like ODIS) with an active online connection to Audi's factory servers in Germany. The process involves a technician logging into the system and having the server verify that the part is not from a stolen vehicle and then 'adapting' or 'marrying' the used part's serial number to your car's VIN.

• Audi Dealer: Any Audi dealership can perform this service.
• Independent Specialist: Many independent shops that specialize in German vehicles have the necessary tools and subscriptions (ODIS/GeKo) to perform Component Protection removal. This is often a more cost-effective option than a dealer.
• Remote Services: Some companies offer remote CP removal, but this requires you to have a specific diagnostic interface tool (like a VAS5054) and a stable internet connection for them to use.

Buying a Used CD Changer

Purchasing a used OEM CD changer is a great way to save a significant amount of money compared to a new unit from the dealer. However, you must factor in the additional cost of Component Protection removal.

• Verify the Part Number: Ensure the part number on the used unit matches your original one exactly. The primary OEM part number is 8X0035110B (sometimes written as 8X0 035 110 B). While other units may look identical, they might have different internal software and will not work.
• Physical Inspection: Check the used unit for any signs of physical damage, especially to the connectors on the back.
• Budget for Programming: Remember that the price of the used part is not the final cost. You MUST budget for a dealer or specialist to remove the Component Protection.
• Why Used OEM is Better: For this part, there are no new aftermarket alternatives. A used OEM unit, once properly programmed, is identical to a new one in function. It is designed to integrate perfectly with the MMI system.

Replacement Overview

Physically replacing the CD changer is a straightforward process that most DIYers can complete in under 30 minutes.

1. Obtain Radio Removal Keys: You will need a set of standard Audi radio removal keys. These are inexpensive and widely available online.
2. Insert the Keys: Insert two keys into the horizontal slots on the front of the CD changer until they click into place.
3. Pull the Unit Out: The keys release the locking tabs, allowing you to pull the entire unit straight out of the glove box.
🎬 Watch: Step-by-step Audi glove box CD changer removal tutorial
4. Disconnect the Harness: Squeeze the tabs on the large electrical connector at the back and pull to disconnect it.
5. Install the New Unit: Connect the harness to the replacement unit, slide it back into the glove box until it clicks securely, and then remove the keys.

Known Issues, TSBs, and Recalls

Searches for recalls and Technical Service Bulletins (TSBs) on the NHTSA database did not reveal any specific actions for this CD changer part number across the listed vehicles. Most issues are related to individual component failure or the Component Protection system. There is a TSB (91-16-67) related to MMI software updates for various issues, but it does not specifically target CD changer failures.

Cost Comparison

Frequently Asked Questions