VCDS (Vag-Com Diagnostic System) software allows users to customize various settings in their Volkswagen Audi Group (VAG) vehicles. One crucial aspect of VCDS involves understanding and modifying “Vcds Bytes.” This article will explain what VCDS bytes are and provide examples of common modifications using byte coding within the 09 – Central Electrics module. We’ll specifically focus on exterior lighting customizations for an Audi A6 C6, referencing real-world coding examples.
What are VCDS Bytes?
In VCDS, a byte represents a group of eight bits. Each bit acts as a switch, either on (1) or off (0), controlling a specific function within the vehicle’s control modules. Modifying these bits allows users to enable or disable features, adjust settings, and personalize their car. Accessing and modifying these bytes is typically done through the “Long Coding Helper (LCH)” function within VCDS.
Common VCDS Byte Modifications in the 09 – Central Electrics Module
Many exterior lighting customizations are controlled within the 09 – Central Electrics module. Below are some common modifications and their corresponding byte and bit locations:
Disabling Amber Corner Lights
- Byte 10, Submodule 0, Bit 3: Setting this bit to 0 disables the amber cornering lights. This modification provides a cleaner, more modern look to the front turn signals.
Enabling DRL Selectable via MMI
- Byte 3, Bit 5: Setting this bit to 1 enables the option to control the Daytime Running Lights (DRLs) through the Multi Media Interface (MMI). This gives the driver greater control over DRL activation.
Disabling “Lights are on” Warning
- Byte 5, Bit 3: Setting this bit to 0 disables the audible warning chime that sounds when the exterior lights are left on.
Enabling Various DRL Options
- Byte 2: This byte controls various DRL options. Specific bits correspond to activating DRLs via different light sources:
- Bit 1: DRL via Front Side Markers
- Bit 2: DRL via High Beams
- Bit 3: DRL via Fog Lights
- Bit 4: DRL via LEDs
- Bit 6: DRL via Side Markers
- Bit 7: DRL via Tail Lights
Enabling Curb Side Lighting (Cornering Fog Lights)
- Byte 4, Bit 0: Setting this bit to 1 activates the fog light on the side corresponding to the activated turn signal. Note: Headlights must be on without fog lights activated for this feature to work.
Keeping LED DRLs On With Turn Signals
- Byte 3, Bit 7: Changing this bit from 1 to 0 allows the LED DRLs to remain illuminated while the turn signals are active.
Troubleshooting: Missing Long Coding Helper
Some users may encounter situations where the Long Coding Helper (LCH) is not available. This can be due to various factors, such as using an older version of VCDS or incompatibility with specific control modules. Ensure your VCDS software is updated to the latest version to access the LCH functionality. If the issue persists, consult the Ross-Tech website for troubleshooting guidance.
Conclusion
Understanding VCDS bytes is essential for customizing your Audi vehicle. While this article focused on exterior lighting modifications in the 09 – Central Electrics module, many other modules and functions can be customized using byte coding. Always proceed cautiously when making changes with VCDS and refer to reputable resources, like the Ross-Tech Wiki, for detailed instructions and support. Remember to document any changes made to your vehicle’s coding for future reference.
