This guide provides a comprehensive overview of using VCDS (Vag-Com Diagnostic System) on a Volkswagen Golf Mk4 (including Jetta and New Beetle models). While Ross-Tech, the creators of VCDS, are not responsible for any issues arising from following these instructions, this information is compiled to assist users in understanding the capabilities of VCDS with their Mk4. Proceed at your own risk.
Supported Modules and Functions in VCDS for Golf Mk4
VCDS offers extensive compatibility with various modules in the Golf Mk4. Here’s a breakdown of the modules and their functionalities accessible through VCDS:
Engine (Module 01 – KWP-1281)
- Idle Speed Adaptation: This function allows adjustment of the idle speed. With a warmed-up engine at idle, navigate to [Select] [01 – Engine] [Adaptation – 10]. Input Channel 01 (Channel 02 for TDI engines) and enter an adaptation value between 124 and 132. [Save] the changes. Note: This may not function with APH engines; consult your repair manual. The specific values and adjustment range depend on the engine and ECU.
- Throttle Body Alignment: Refer to the dedicated Throttle Body Alignment page for detailed instructions on this procedure.
- Cruise Control Activation (DBW): New ECUs often have cruise control deactivated. If the Component field in VCDS lacks a “G” when connected to the Engine module, activate cruise control by navigating to [Select] [01 – Engine] [Login – 11] and entering 11463. [Do It!]. A “G” should appear in the Component field afterward.
Other Modules and their Functions
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Automatic Transmission (Module 02 – KWP-1281): VCDS functions correctly with this module.
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ABS Brakes (Module 03 – KWP-1281/KWP-2000): VCDS operates seamlessly with both KWP-1281 (earlier models) and KWP-2000 (2001+ models).
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HVAC (Module 08 – KWP-1281): Full functionality with VCDS.
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Airbags (Module 15 – KWP-1281): Before accessing the Airbag controller, carefully review the important safety information provided by Ross-Tech.
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Instruments (Module 17 – KWP-1281): VCDS works correctly with this module. Features include Immobilizer II and III instructions and recoding for warning lamps (brake pad wear, seatbelt, washer fluid level, etc.). Detailed coding instructions are available within VCDS.
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CAN Gateway (Module 19 – KWP-1281): Located in the instrument cluster, this module manages CAN-BUS communication. Coding options include support for automatic transmission, ABS brakes, and airbags.
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All-Wheel Drive (Module 22 – KWP-1281): Functions properly with the Haldex system on applicable models.
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Central Locks (Module 35 – KWP-1281): For vehicles with manual windows only. VCDS functions as expected.
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Navigation (Module 37 – KWP-1281): Full functionality with VCDS.
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Central Convenience (Module 46 – KWP-1281): For vehicles with power windows. Allows customization of numerous features, including selective unlocking and horn/flash confirmation for locking/unlocking.
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Rear Spoiler (Module 54 – KWP-1281): Works with the New Beetle 1.8T.
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Headlight Range (Module 55 – KWP-1281): Controls the OEM Xenon HID system on some models. Allows for headlamp coding and adjustment.
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Radio (Module 56 – KWP-1281): Allows for radio recoding to adjust sound field tuning, speaker system, sound correction, and CD player/changer settings.
Conclusion
VCDS provides a powerful tool for diagnosing and customizing your Volkswagen Golf Mk4. This guide provides a starting point for exploring the various modules and functions accessible through VCDS. Always refer to the official Ross-Tech documentation and your vehicle’s repair manual for detailed instructions and safety precautions before making any modifications. Understanding the capabilities and limitations of VCDS ensures a safe and effective diagnostic and customization experience.
