This guide provides step-by-step instructions on how to disable the eyebrow daytime running lights (DRLs) and enable the fog lights as DRLs on an Audi A3/S3 8P/FM platform using VCDS (Vag-Com Diagnostic System). This modification is popular among owners who prefer the aesthetic of fog light DRLs.
This process requires a genuine Ross-Tech VCDS cable and software. Using third-party or counterfeit cables can potentially damage your vehicle’s control modules. Always proceed with caution when modifying your vehicle’s coding.
Disabling the Eyebrow DRLs (Parking Lights)
Initially, attempts to disable the LED Parking Lights (PRLs), often referred to as “eyebrows,” via the commonly suggested method in module 09 – Central Electrics, Byte 27, Bit 2, resulted in fault codes. This method, while effective in disabling the PRLs, triggered error messages in the Driver Information System (DIS) and subsequent “Supply Voltage” faults.
The resulting fault codes indicated an open or short to plus for the LED modules controlling the DRLs and parking lights on both the left and right sides. This is due to the vehicle’s system detecting a lack of current draw where the PRLs were previously active.
02895 - Supply Voltage for LED Module for DRL and Parking Light; Left
010 - Open or Short to Plus
02897 - Supply Voltage for LED Module for DRL and Parking Light; Right
010 - Open or Short to PlusTherefore, directly manipulating Byte 27, Bit 2 in module 09 is not a recommended solution for disabling the eyebrow DRLs on vehicles equipped with LED PRLs. A different coding solution is required to avoid these fault codes. Further research and alternative coding options are necessary to achieve this without triggering errors.
Enabling Fog Light DRLs
Enabling the fog lights as DRLs can be accomplished through VCDS coding modifications. The specific coding location and procedure may vary depending on the exact model year and equipment of your Audi A3/S3 8P/FM. Consult the Ross-Tech VCDS Wiki for detailed, model-specific instructions. Generally, this involves adjusting settings within module 09 – Central Electrics.
Conclusion
While enabling fog light DRLs is typically straightforward using VCDS, disabling the eyebrow DRLs on models with LED PRLs requires a more nuanced approach than the commonly suggested Byte 27, Bit 2 modification. Directly manipulating this bit can lead to fault codes and error messages. Always consult reputable resources like the Ross-Tech VCDS Wiki and forums for verified coding solutions and best practices to avoid potential issues and achieve the desired results without causing errors. Remember to always back up your original coding before making any changes.
