Enabling cruise control on a VW T4 can significantly enhance driving comfort, especially on long journeys. This guide provides a detailed walkthrough of the process using VCDS (VAG-COM Diagnostic System) for a 2005 Volkswagen Transporter T4. We will address common issues and provide solutions for successful coding.
Understanding the Basics: Modules and Prerequisites
Before diving into the coding procedure, it’s crucial to identify the relevant modules in your T4. For a 2005 model, you’ll typically encounter the following:
- Engine Control Module: The specific part number in the provided scan is 070 906 016 BD. This module is critical for managing engine functions, including cruise control.
- Central Electronics Module (CEM): Identified as 7H0 937 049 K in the scan. While the provided scan doesn’t explicitly mention cruise control support within the CEM’s long coding helper, it often plays a role in enabling the feature.
Prerequisites:
- VCDS Software: Ensure you have a licensed and updated version of VCDS software. The example uses version 15.7.4.1, but newer versions are recommended for compatibility and updated data.
- VCDS Interface: A compatible VCDS interface (HEX-CAN or newer) is necessary to connect your computer to the vehicle’s OBD-II port.
- Vehicle Compatibility: Confirm that your specific VW T4 model year and engine variant support cruise control retrofitting.
Addressing the “Error 22: Conditions Not Correct or Request Sequence Error”
One common issue encountered when attempting to code cruise control on a VW T4 is “Error 22: Conditions Not Correct or Request Sequence Error” within the engine module. This error typically indicates one or more of the following:
- Incorrect Coding Procedure: Double-check the coding steps specific to your engine module and VCDS version. Consult reputable online resources, such as the Ross-Tech Wiki, for accurate coding instructions.
- Hardware Incompatibility: Verify that the necessary hardware for cruise control (e.g., cruise control stalk, wiring) is correctly installed and functioning.
- Pre-Coding Requirements: Certain pre-coding steps or adaptations might be required before enabling cruise control. Research your specific engine code and CEM to determine if any preliminary procedures are necessary.
- Underlying Fault Codes: The provided scan reveals a fault code “00290 – ABS Wheel Speed Sensor; Rear Left (G46)” in the ABS module. While seemingly unrelated, unresolved fault codes, especially those related to wheel speed sensors, can sometimes prevent successful coding of other systems. Addressing this ABS fault is recommended.
Troubleshooting and Further Steps
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Consult Ross-Tech Wiki: The Ross-Tech Wiki (www.Ross-Tech.com) offers comprehensive information on VCDS coding and troubleshooting. Search for your specific engine and CEM part numbers to find detailed coding instructions and potential solutions for Error 22.
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Verify Hardware: Thoroughly inspect the cruise control stalk, wiring harness, and related components. Ensure all connections are secure and the stalk functions correctly.
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Check for Compatibility: Research online forums and communities dedicated to VW T4 modifications. Confirm that your specific model year and engine code support cruise control retrofitting and gather insights from others who have successfully completed the process.
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Address Fault Codes: Resolve all existing fault codes, including the ABS wheel speed sensor error, before attempting to code cruise control again. Fault codes can indicate underlying issues that might interfere with coding procedures.
Conclusion
Enabling cruise control on a VW T4 using VCDS requires careful attention to detail and adherence to the correct coding procedures. Addressing Error 22 often involves verifying hardware compatibility, resolving fault codes, and consulting reputable resources like the Ross-Tech Wiki for specific coding instructions. By systematically troubleshooting and following the outlined steps, you can increase your chances of successfully activating cruise control on your VW T4.
