Introduction
The Volkswagen T5 Transporter is a popular van known for its versatility. Adding cruise control significantly enhances driving comfort, especially on long journeys. This guide provides a detailed walkthrough on how to activate cruise control on a VW T5 using VCDS (Vag-Com Diagnostic System). We’ll cover common issues, necessary equipment, and step-by-step coding instructions. Specifically, we will address a common problem encountered when attempting to enable cruise control on a 2005 VW T5 with engine code 070 906 016 BD and central electrics module 7H0 937 049 K.
Understanding the Components
Before diving into the coding process, it’s crucial to understand the modules involved in cruise control functionality on a VW T5:
- Engine Control Module (ECM): This module manages the engine’s performance, including throttle control, which is essential for cruise control operation. The ECM needs to be coded to recognize and respond to cruise control inputs.
- Central Electrics Module (CEM): The CEM acts as a central hub for various electrical systems in the vehicle, including the steering wheel controls for cruise control. This module also needs to be configured correctly for cruise control to function. The specific CEM part number in this case is 7H0 937 049 K.
Troubleshooting “Error 22: Conditions Not Correct or Request Sequence Error”
The error “Error 22” when attempting to code the engine module often indicates a problem with prerequisites. Here are potential causes and solutions:
- Incorrect Coding Sequence: Ensure you are following the correct coding procedure outlined in the VCDS software or reputable online resources. Double-check each step and ensure the correct values are being entered.
- Incompatible Hardware/Software: Verify that your VCDS software and hardware interface are compatible with your 2005 VW T5. Outdated software or a faulty interface can cause communication errors. The user in the original post is using VCDS version 15.7.4.1, which may need to be updated.
- Low Battery Voltage: A low battery can disrupt the coding process. Ensure the battery is fully charged or connected to a charger before attempting to code.
- Other Fault Codes: Address any other fault codes present in the engine or central electrics modules before attempting to activate cruise control. In the original post, a fault code related to the ABS wheel speed sensor was found. This may or may not be related to the cruise control issue but should be resolved nonetheless.
Step-by-Step VCDS Coding Guide (General)
While specific coding instructions vary depending on the exact module versions, here’s a general outline of the process:
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Connect VCDS: Connect the VCDS interface to the vehicle’s OBD-II port and launch the software.
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Select Control Module: Select the appropriate control module (Engine or Central Electrics) from the VCDS main screen.
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Read Coding: Access the “Coding” or “Long Coding Helper” function within the selected module. Read and record the existing coding for backup purposes.
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Modify Coding: Using the “Long Coding Helper,” carefully modify the coding to enable cruise control. Consult reliable resources like the official Ross-Tech Wiki for specific coding instructions based on your module part numbers.
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Test Functionality: After saving the new coding, test the cruise control functionality to ensure it’s working correctly.
Conclusion
Activating cruise control on a VW T5 using VCDS involves understanding the relevant modules, troubleshooting potential errors, and following the correct coding procedure. This guide provides a starting point for the process. Remember to always refer to official documentation and reputable resources for precise coding instructions tailored to your specific vehicle and module versions. If you continue to experience issues, consult with a qualified VW technician or the Ross-Tech support forum.
