This guide provides step-by-step instructions on performing a Xenon headlamp range adjustment using VCDS (Vag-Com Diagnostic System) on Volkswagen and Audi vehicles. This procedure is crucial for ensuring optimal headlight performance and avoiding common issues. Properly adjusted headlights maximize visibility for the driver while minimizing glare for oncoming traffic. This process involves resetting the motorized headlamp adjusters to their center position, allowing for accurate manual adjustment. It’s important to note that this procedure alone does not align the headlamps; you’ll still need to manually fine-tune them using the adjusting screws and an aiming target.
This procedure applies primarily to older Xenon systems utilizing the KW-1281 protocol. For newer vehicles equipped with KWP-2000 or CAN systems, consult the official Ross-Tech wiki for model-specific instructions.
Prerequisites for Xenon Range Adjustment
Before beginning the Xenon range adjustment with VCDS, ensure your vehicle meets the following conditions:
- Level Ground: Park the vehicle on a level surface to ensure accurate adjustments. The suspension should be settled.
- Parking Brake: The parking brake should be disengaged (OFF).
- Ignition: Turn the ignition to the “On” position without starting the engine.
- Headlamps: Ensure the headlamps are switched “Off”.
VCDS Xenon Adjustment Procedure
Follow these steps carefully to perform the Xenon range adjustment:
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Select Xenon Range Module: Connect your VCDS interface and launch the software. Navigate to [Select] [55 – Xenon Range]. In some newer vehicles, this module might be located under [29 – Left Light].
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Access Basic Settings: Once inside the Xenon Range module, go to [Basic Settings – 04]. Select Group 001 and click [Go!].
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Wait for Adjustment: Allow at least 20 seconds for the headlamp motors to complete their cycle and move to the center adjustment position. You may hear the motors whirring during this process.
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Manual Adjustment: Turn on your headlights. Using the manual adjusting screws on the headlamp housing, adjust the beams against a suitable aiming target, such as a wall or specialized alignment equipment.
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Confirmation: In VCDS, scroll up to Group 002. This confirms that the Xenon Range controller has learned the new position as its home position.
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Completion: Click the [Done, Go Back] button to exit the procedure. Your Xenon headlamp range adjustment is now complete.
Troubleshooting and Considerations
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Error Messages: Lowered vehicles might display error messages in Basic Settings group 001 or 002. This often indicates that the vehicle height sensor(s) are bottomed out. Bending the sensor bracket might be necessary to allow for proper adjustment. Ensure the sensor arms are correctly oriented.
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Incomplete Procedure: Partially completing this procedure may trigger a Diagnostic Trouble Code (DTC) in the Xenon Range memory, indicating “Headlights not adjusted.” Always complete the entire procedure to avoid this.
This guide provides a general overview of the Xenon range adjustment process using VCDS. Always refer to your vehicle’s Factory Repair Manual for specific instructions and safety precautions. Incorrectly adjusted headlamps can significantly impact visibility and safety. If you are unsure about any step, consult a qualified automotive technician.
