The Volkswagen Polo, like many modern cars, utilizes a Body Control Module (BCM) to manage various functions, including lighting. This module can differentiate between incandescent and LED lamps and uses “Leuchte-sets” to control them. Sometimes, when changing to LED reverse lights, a VCDS error related to “Leuchte28RFL C3” might appear. This article explains the cause of this error and provides a solution using VCDS coding.
Understanding the “Leuchte28RFL C3” Error in VW Polos
The “Leuchte28RFL C3” designation within VCDS specifically refers to the reverse light control set in your VW Polo. The error typically arises due to a mismatch between the BCM’s expected lamp type and the actual LED lamp installed.
Within the “Leuchte28RFL C3” Leuchte-set, there’s a channel called “Type_Of_Load”. This setting informs the BCM about the type of bulb installed – either incandescent or LED. If your Polo originally came with incandescent reverse lights and you’ve switched to LEDs, this setting likely still indicates “incandescent”.
Because the BCM anticipates a higher current draw from an incandescent bulb, the lower current consumption of the LED triggers an error. The system interprets the lower current as a fault, even though the LED is functioning correctly. Additionally, the “Dimming_AB” setting, if at 100, further confirms the system is configured for an incandescent bulb, as the maximum dimming value for LEDs is usually 127.
Resolving the Error with VCDS
To rectify this issue, you need to adjust the “Type_Of_Load” setting within the “Leuchte28RFL C3” Leuchte-set using VCDS. The goal is to select a value that designates the lamp type as LED.
While there might not be an exact match for your specific LED bulb within the VCDS options, choosing any setting with “LED” in its description will generally suffice. The key is to inform the BCM that an LED lamp is now installed. A general or “allgemeine” LED setting is often a suitable choice.
Furthermore, adjusting the “Dimming_AB” value within the same Leuchte-set to 127 is recommended. Although it might not noticeably improve brightness, it ensures the correct configuration for LED lamps.
Experimentation and Fine-Tuning
Finding the right VCDS code might require some trial and error. Don’t hesitate to experiment with different “LED” settings within the “Type_Of_Load” channel until the error clears. Remember to save any changes made before testing.
By adjusting these settings using VCDS, you can eliminate the reverse light error in your VW Polo after installing LED bulbs and ensure the system functions correctly. Remember to always double-check your work and consult reputable resources if you have any doubts.
