2015-2018 Audi A7, A8, S7, S8 & RS7 Park Assist Module: Solving Failures and Component Protection

Symptoms of a Failing Park Assist Module

When the park assist control module begins to fail, you'll notice obvious issues when you put the car in reverse. Because the module is the brain of the system, a failure here can look like a camera or screen problem, but the root cause is often the module itself.

• Black or Blank Screen: The most common symptom is a completely black or blank screen when you shift into reverse. The MMI display may work perfectly for radio or navigation, but it shows no camera image.
• Parking System Menu Grayed Out: In the MMI settings, the menu for the "Parking System" may be grayed out and inaccessible.
• No Parking Sensor Tones: The audible beeps from the parking sensors may stop working entirely.
• "No Signal/Communication" Fault Code: A diagnostic scan may show a fault code indicating no communication with the park assist control module (address 1327 or 6C). This points directly to a module that is unpowered or has failed internally.
• Intermittent or Distorted Video: Before a complete failure, the camera image might flicker, appear grainy, or cut out randomly.

Scanning the vehicle with an OBD-II tool can reveal specific Diagnostic Trouble Codes (DTCs). Common codes associated with a faulty module include:

• B200000: Control unit faulty
• C110400: Camera fault
• C110702: Video line for image processing signal fault
• 1327: Control unit for parking assist - No Signal/Communication

Understanding Component Protection (CP)

This is the single most important factor to understand before replacing this module. Volkswagen/Audi Group vehicles use an anti-theft system called Component Protection. This system links major electronic modules, like the park assist controller, to the car's original factory VIN.

If you install a replacement module—especially a used one from another vehicle—it will trigger a "Component Protection Active" fault. When this happens, the module will have limited or zero functionality until the protection is removed. The camera system will not work, even if the new module is perfectly functional.

How to Remove Component Protection

You cannot remove Component Protection yourself without specialized tools. It is not a simple plug-and-play repair.

1. Audi Dealership: The official method is to have an Audi dealer adapt the new module to your vehicle. They use a proprietary online system (ODIS/GEKO) to connect to Audi's servers and authorize the part for your car's VIN. This is the most reliable but also the most expensive option.
2. Independent Specialist: Many independent shops specializing in German vehicles have the same ODIS tools and subscriptions to perform Component Protection removal. They typically charge significantly less than a dealer.
3. EEPROM Swap (Expert Level): A highly technical workaround involves physically desoldering the small EEPROM memory chip from your original, faulty module and soldering it onto the replacement board. This chip contains the car-specific security data. This tricks the replacement module into thinking it is the original part, bypassing CP entirely. This requires micro-soldering skills and carries a high risk of damaging the boards.

Buying a Used Park Assist Camera Control Module

A used OEM module is an excellent way to save money, but you must plan for the extra step of programming. Cheap aftermarket modules are generally not available or recommended for this part due to the complex integration with the vehicle's systems.

• Verify the Part Number: Match the part number on your original module exactly. The primary numbers are 4H0907801F, 4H0907801G, and 4H0907801H. Part numbers may supersede, so check with a parts diagram if you are unsure.
• Inspect for Damage: Check the replacement module for any signs of physical damage, especially to the connectors. Avoid any parts that show signs of water intrusion or corrosion.
• Budget for Programming: A used module is not plug-and-play. You must factor in the cost of Component Protection removal. Before buying the part, call local Audi dealers and independent German auto specialists to get quotes for this service. Expect to pay between $100 and $400 for programming.
• Keep Your Old Module: Do not discard your original module until the replacement is fully working. In a worst-case scenario, a technician may need the EEPROM chip from the old board to make the new one work.

Replacement Procedure and Location

The Park Assist Control Module is located in the trunk of the vehicle, typically on the left (driver's) side, behind the trim paneling. You will need basic tools like a trim removal kit and Torx drivers.

1. Disconnect the Battery: Before working on any electronic module, disconnect the negative terminal of your vehicle's battery.
2. Access the Module: In both the Audi A8/S8 (D4 platform) and A7/S7/RS7 (C7 platform), you must remove the left-side trunk liner or access panel to expose the electronics rack.
3. Locate the Module: The module is a small plastic box, often mounted in a metal bracket alongside other controllers like the audio amplifier. It will have one or two large electrical connectors.
4. Remove and Replace: Unplug the electrical connectors by pressing their release tabs. Unbolt the module from its bracket (typically held by Torx screws). Install the new module, reconnect the wiring, and reassemble the trunk trim.
5. Programming: After installation, the vehicle must be taken to a dealer or specialist to have Component Protection removed and the system calibrated.

Cost Comparison

The cost to fix a failed park assist module varies greatly depending on the parts you choose and who performs the labor and programming.

Frequently Asked Questions (FAQ)