Activating LED parking lights on a MK5 platform vehicle requires coding changes using VCDS (Vag-Com Diagnostic System). This process involves disabling cold diagnostics and potentially addressing bulb out warnings due to the lower power draw of LEDs. This guide outlines the necessary steps and solutions for common issues.
Coding LED Parking Lights with VCDS
To deactivate the bulb out warning for your parking lights, access the Central Electronics Control Module in VCDS. Within the coding section, locate Byte 23. Modifying Bit 5 or 6 to “off” typically disables the check for parking light bulb failures. However, this doesn’t address the root cause of the issue: the car’s system detecting a difference in resistance between traditional incandescent bulbs and LEDs.
Addressing LED Bulb Out Warnings
Because LEDs consume less power than incandescent bulbs, the car’s computer may interpret this as a faulty bulb, triggering a warning light on the dashboard. Two primary solutions exist:
High LED Count Bulbs
Using bulbs with a higher number of LEDs can increase the overall load on the circuit. This can sometimes trick the CANBUS system into believing a standard bulb is present, thus preventing the error message. This solution often works for reverse lights and license plate lights.
LED Bulbs with Built-in Resistors
Alternatively, choose LED bulbs specifically designed with built-in resistors. These resistors mimic the resistance of a traditional bulb, effectively eliminating the bulb out warning without requiring any additional wiring or modifications. This is a popular choice for parking lights, especially when used in conjunction with HID headlights.
Disabling Cold Diagnostics with VCDS
Regardless of your chosen solution, it’s highly recommended to disable cold diagnostics for LED lights. This feature sends a brief pulse of electricity to the bulbs upon startup to check for functionality. Over time, these pulses can damage LED diodes, shortening their lifespan. Disabling cold diagnostics can significantly extend the life of your LED lights. This setting is also typically found within the Central Electronics Control Module in VCDS, though the specific byte and bit may vary depending on the exact vehicle model.
Conclusion
Successfully activating LED parking lights on your MK5 platform vehicle with VCDS involves coding changes and choosing the right type of LED bulb. By understanding how to disable bulb out warnings and cold diagnostics, you can enjoy the benefits of LED lighting – brighter illumination and longer lifespan – without encountering frustrating error messages or premature bulb failure. Remember to consult your vehicle’s specific wiring diagrams and coding instructions for precise guidance.
