Coding with VCDS allows customization and modification of control modules in Volkswagen, Audi, Seat, and Skoda vehicles. This guide explores the intricacies of VCDS coding, covering various aspects from basic recoding to advanced functionalities like long coding and experimental coding.
Understanding VCDS Coding
VCDS (Vag-Com Diagnostic System) offers a powerful “Recode” function, equivalent to VAG 1551/1552 function 07. This function allows users to adjust various settings within a vehicle’s control modules. However, it’s crucial to understand the process and potential implications before making any changes.
Key Considerations Before Coding
Before diving into Coding Vcds, keep these important points in mind:
- Login Requirements: Some modules necessitate a valid login before recoding is possible.
- Workshop Code (WSC): VCDS uniquely allows modification or retention of the original Workshop Code. Other diagnostic tools often leave a default WSC after recoding.
- Importer Number: Relevant for controllers using KWP-2000 protocol. Usually remains unchanged unless a specific Importer Number is pre-set in VCDS options.
- Coding Chart Data: Label files within VCDS can contain up to 20 lines of coding chart data, providing valuable information displayed within the coding screen.
Specific Coding Procedures in VCDS
VCDS offers specialized coding procedures for different modules and functionalities:
Airbag Coding
VCDS can suggest coding values for new airbag modules based on their index number. Accessible via the [Coding Helper] button, this feature streamlines the process, particularly for VW models. While not guaranteed to be accurate, the suggestion provides a starting point. Incorrect coding values are typically rejected by the module. More information can be found on the Ross-Tech Wiki. The suggested coding, whether short or long, will be displayed for confirmation.
Coding Slave Modules
Modern vehicles often employ “slave” modules that can be coded through VCDS. Both regular and long coding screens provide a dropdown list for selecting the specific module requiring adjustments.
Battery Coding Assistant
Replacing a battery often requires coding the new battery within the 61-Battery Regulation module. VCDS simplifies this process with a dedicated Battery Coding Assistant. Remember to enter the 10-digit serial number, omitting any preceding vendor codes.
Installation List
Certain vehicles, like the Audi B8 platform, require using the [Installation List] button within the CAN Gateway’s Open Controller screen to access Gateway Installation settings. This functionality is detailed on the Installation List Page.
Long Coding with VCDS
Complex control modules in newer vehicles often utilize Long Coding, involving up to 255 bytes of hexadecimal data. VCDS supports copy/paste functionality and integrates with the Long Coding Helper for easier management.
Utilizing the Long Coding Helper
The Long Coding Helper, particularly when used with tools like LCode.exe, simplifies the interpretation and modification of Long Coding strings. Selecting Byte numbers reveals corresponding options, allowing users to check or uncheck boxes for desired configurations. Some operations utilize dropdown menus for more complex multi-bit adjustments.
Experimental Coding with VCDS
To address the increasing complexity of modern vehicles, VCDS provides access to “Raw” or “Experimental” coding data for newer modules. This feature, available with HEX-NET and HEX-V2 interfaces, offers advanced coding possibilities but requires caution. VCDS clearly identifies experimental data with a warning and a yellow background in the Long Coding Helper.
Saving and Applying Coding Changes
After making changes, use the [Do It!] button to save the new coding to the controller. A soft reset option can prompt the module to reboot, ensuring changes take effect. An uninitialized control module warning might appear, often requiring the entry of non-zero values for Workshop Code, Importer, or Equipment numbers. The [Cancel] button allows exiting without saving changes.
Conclusion
Coding VCDS offers extensive customization capabilities for compatible vehicles. Understanding the various coding methods and utilizing the provided tools within VCDS allows users to safely and effectively modify control module settings. However, always proceed with caution and consult reliable resources before making any changes. Remember that incorrect coding can potentially lead to malfunctions or errors.
