2003-2010 Audi A8 & S8 Ventilated Seat Control Module Guide
This guide clarifies the function, failure symptoms, and critical replacement details for the ventilated seat control module in the D3 generation Audi A8 and S8.
- This is a Ventilated Seat Control Module, not a general Body Control Module (BCM). It only controls front seat heating and cooling.
- Replacement requires dealer or specialist programming to remove 'Component Protection,' otherwise seat memory will not work.
- Part number 4E0910772A must be matched exactly. Pay close attention to VIN splits for 2003 and 2004 models.
- Failure symptoms include non-working heat/ventilation or functions that shut off after 30 seconds.
Understanding This Part: It's Not a BCM
Many owners search for "Body Control Module" when troubleshooting electrical issues. However, the part number 4E0910772A is not the main BCM for the 2003-2010 Audi A8 or 2007-2009 Audi S8. It is the dedicated Ventilated Seat Control Module, also known as the Climatised Seat Module or technically as J799. Its only job is to control the heating and cooling functions of the front seats. If you are experiencing issues with lights, locks, or windows, you have a problem with a different module, likely the main BCM (J519).
Known Issues and Failure Symptoms
Failures of the ventilated seat control module typically manifest in predictable ways. Diagnosing the issue often starts with a full vehicle scan using a compatible tool like VCDS (VAG-COM) or an advanced OBD-II scanner.
Common Symptoms:
- Seat ventilation or heating is completely non-functional: The lights on the climate control switch may illuminate, but no air blows from the seat perforations, and no heat is felt.
- Function stops after a short time: The ventilation or heat may turn on for about 30 seconds and then shut off. This can indicate the module is detecting a fault with a fan or sensor and is shutting down to prevent damage.
- One function works but not the other: You may have heat but no ventilation, or vice-versa.
- Intermittent operation: The features may work sometimes and not others, which could point to failing internal components or loose connections under the seat.
- Inability to save seat memory settings: On cars with memory seats, a faulty module can prevent new positions from being saved.
- Warning lights: In some cases, a fault in a seat module can trigger an airbag warning light if it's part of the seat occupancy detection system.
Associated OBD-II and VAG-COM Fault Codes:
A diagnostic scan is the best way to confirm a module failure. Look for codes related to the seat systems. While a comprehensive list is vast, common codes may include:
- Faults stored in Address 36: Seat Mem. Drvr or 06: Seat Mem. Pass.
- Codes indicating "No Communication" with the seat module.
- B10CD00: Function restriction caused by energy management.
- 16349 / 014: Control Module - Faulty.
- Codes related to seat ventilation blowers or temperature sensors being open or shorted.
- Component Protection Active: This fault will appear if a used module is installed without being adapted to the vehicle.
Programming, Coding, and Component Protection
This is the most critical aspect of replacing this module in an Audi A8 or S8.
Warning: A replacement module, whether new or used, cannot simply be swapped in. It is subject to Audi's Component Protection system.
Component Protection is an anti-theft feature that links various control modules to the car's factory identity. When a module from another vehicle is installed, its Component Protection will be "active," and some or all of its functions will be disabled. For this specific seat module, an active Component Protection typically results in the seat memory functions being disabled. While basic seat movement might work, you will not be able to save or recall memory positions until the protection is removed.
Removing Component Protection must be done online by connecting the vehicle 🎬 See a demonstration of removing seat component protection. to Audi's factory servers. This service is typically only available at Audi dealerships or some high-end independent shops with the proper ODIS (Offboard Diagnostic Information System) software and a legitimate subscription. There are some third-party services online that claim to remove component protection remotely, but these can be risky.
Pro Tip: Before swapping the module, ask your original module if it can be read by a diagnostic tool. If so, save the existing "coding" value. 🎬 Learn how to program and code Audi control modules. This long string of numbers tells the module which options are installed in the seat (e.g., ventilation, massage). You will need to write this same coding to the replacement module after Component Protection is removed to ensure all features work correctly.
Replacement Guide
The ventilated seat control module is located underneath the front seat, attached to the seat frame. To access it, the entire front seat must be unbolted from the vehicle floor 🎬 Watch this walkthrough on how to remove the front seat. and carefully tilted back or removed.
- Disconnect the Battery: Before working on any part of the seat, especially with its integrated airbags, disconnect the battery's negative terminal.
- Remove Seat Mounting Bolts: The seat is typically held in by four large triple-square bolts at the front and rear of the seat rails. Plastic covers will need to be popped off to access them.
- Tilt or Remove the Seat: Carefully tilt the seat backward to access the wiring harnesses and module underneath. Be mindful not to scratch interior trim.
- Locate and Swap the Module: The module is a small black plastic box held in a bracket. Disconnect the electrical connectors, release the retaining tabs, and swap it with the replacement unit.
- Reconnect and Reinstall: Reconnect all wiring, bolt the seat back into place, and then reconnect the battery.
Buying a Used Ventilated Seat Control Module
Purchasing a used OEM module is a cost-effective way to solve this issue, but careful verification is essential.
- Match the Part Number: You MUST match the OEM part number exactly. The primary number is 4E0910772A. Do not install a module with a different part number, even if it looks identical.
- Verify VIN and Production Splits: Pay close attention to the vehicle's production date. As noted, there are specific fitments for early models:
- 2003 Audi A8: Only fits models with 'E' as the 8th digit of the VIN and a serial number from 9001 onwards.
- 2004 Audi A8: Fitment begins from VIN serial number 9001.
- Physical Inspection: When you receive the used part, inspect the casing for any signs of water damage, corrosion, or physical cracks. Check that the connector pins are straight and clean.
- Budget for Programming: Remember that you will have to pay a dealer or specialist shop for labor to remove Component Protection. Factor this cost into your budget.
Cost Comparison
Prices can vary based on supplier and condition. Always factor in the mandatory programming cost.
| Part Source | Estimated Cost |
|---|---|
| New OEM | $450 - $600+ (if available) |
| Used OEM | $50 - $150 |
| Remanufactured | Not commonly available |
| Shop Labor (Replacement) | $100 - $200 |
| Shop Labor (Component Protection Removal) | $150 - $300 (typically 1-2 hours of labor) |
Frequently Asked Questions (FAQ)
Can I just swap the module from my old seat to a replacement seat?
Yes. If you are replacing the entire seat with a used one, the easiest way to avoid Component Protection issues is to transfer the original seat control module from your old seat to the new one. This way, the car still recognizes its original module.
What does the 'E' in the 8th VIN digit for 2003 models mean?
The 8th digit of a VIN typically specifies the engine type or other vehicle descriptors. For this specific part, it indicates a particular configuration of the A8 that was equipped with ventilated seats early in the production run. It's a critical piece of information for ensuring compatibility on that first model year.
Will the car drive if the module has Component Protection active?
Yes. An active Component Protection on the seat module will not prevent the car from starting or driving. It will only limit the functionality of the seat itself, primarily affecting the memory features.
Can I fix my old module instead of replacing it?
It is generally not feasible for a DIY repair. Failures are often due to internal circuit board issues. While a specialist in electronics repair might be able to fix it by replacing a specific chip, swapping the module with a known-good used unit is the most common and reliable solution.
Helpful Videos
Technical Specifications
OEM Part Numbers: 4E0910772A 4E0959772 4E0959772A
Controls front ventilated and heated seats. Operates on the vehicle's 12V system. Communicates with other modules via the car's data bus network.
We Have This Part in Stock
The information in this article is provided for general reference and educational purposes only. Vehicle specifications, procedures, and part compatibility can vary by production date, trim level, and region. Always consult your vehicle's factory service manual and verify part numbers before purchasing or performing repairs. Safety-critical components such as airbags, seat belts, and braking systems should be installed by a qualified professional.
- Audi A8:
- Audi S8:
- 🎬 Helpful Videos
- 🛍️ Shop This Part
- Understanding This Part: It's Not a BCM
- Known Issues and Failure Symptoms
- Common Symptoms:
- Associated OBD-II and VAG-COM Fault Codes:
- Programming, Coding, and Component Protection
- Replacement Guide
- Buying a Used Ventilated Seat Control Module
- Cost Comparison
- Frequently Asked Questions (FAQ)
- 🎟️ Get 5% Off