This guide explains how to activate the indirect Tire Pressure Monitoring System (TPMS) on your VW or Audi using VCDS, effectively turning off the direct TPMS system. This is particularly useful for those who want to avoid replacing expensive TPMS sensors or use a second set of wheels without sensors.
There are two main types of TPMS: direct and indirect. Direct TPMS uses sensors inside each tire to measure pressure, while indirect TPMS relies on the ABS system to detect pressure changes based on wheel speed. Indirect TPMS offers the advantage of not requiring sensor replacement and works seamlessly with multiple wheel sets. This guide focuses on enabling the often hidden indirect TPMS using a VCDS diagnostic tool.
Understanding TPMS and VCDS
VW and Audi vehicles often have the capability for both direct and indirect TPMS. However, the indirect system may be deactivated by default. VCDS (VAG-COM Diagnostic System) allows access to the vehicle’s control modules to modify settings, including activating the indirect TPMS. This process involves changing the long coding within specific modules.
Activating Indirect TPMS with VCDS
Important Warning: Disabling the direct TPMS system and relying solely on the indirect system may not be legal in all regions. Consult local regulations before proceeding. A functioning TPMS system is crucial for safety.
Prerequisites:
- Ross-Tech VCDS cable and software
- Tire pressure gauge
Procedure:
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Connect and Initialize VCDS: Plug in your VCDS cable and launch the software. Ensure the cable’s green LED is illuminated. Select “Select” to access the control modules.
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Access ABS Controller: Select “ABS controller.” The module part number (“VAG Number”) will be displayed. Look for “Long Coding” under the Software Coding label. If a number is displayed instead, your module may be incompatible. Click on “Coding.”
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Modify Long Coding: Click on “Long Coding Helper.” Crucially, record your original coding before making any changes! This allows you to revert back if needed.
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Enable Indirect TPMS: In the Long Coding Helper, navigate to Byte 16. Locate “Bit 2 – Tire pressure monitoring (TPMS/7K6) installed” and check the box.
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Save Changes: Exit the Long Coding Helper. The modified code will appear under “New coding.” Click “Do it!” to save and implement the new coding. Exit the module.
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System Adaptation: After turning on the ignition, the TPMS light should briefly illuminate. The indirect TPMS requires a driving period (at least one hour, including highway driving) to adapt and learn the vehicle’s characteristics. During this adaptation period, the TPMS readings may be unreliable.
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Reset TPMS (If Necessary): If a TPMS warning light persists, you might need to manually reset the system. In the ABS module, go to “Basic Settings,” select “Group 042,” and click “Go!” to perform a reset. This step might not be required on all vehicles.
Conclusion
Using VCDS, activating the indirect TPMS and effectively turning off the direct TPMS on your Audi or VW can be achieved by modifying the vehicle’s control module settings. Remember to record your original coding before making any changes and to consult your local regulations regarding TPMS requirements. After the procedure, allow sufficient driving time for the system to adapt for accurate readings. This modification can offer a cost-effective solution for managing TPMS, particularly for owners utilizing multiple wheel sets.
