The use of fog lights for static cornering in vehicles with incandescent headlights is a common practice. However, in vehicles equipped with OEM HID headlights, this function is typically managed by the headlight control module itself. This article explores the intricacies of cornering light adaptations using VCDS (Vag-Com Diagnostic System), specifically focusing on 8V Audi A3 models which share the MQB platform with the Mk7 Golf. It clarifies potential confusion regarding the adaptation channels related to “Abbiegelicht” (cornering light) and “Abblendlicht” (low beam).
Decoding Static Cornering Light Function in 8V VCDS
In older vehicles or those with halogen headlights, the fog lights often double as static cornering lights. Activating this feature involves adjusting specific adaptation channels within the BCM (Body Control Module) using an 8v Vcds. These channels, often labeled as “static AFS Light,” control the activation of the fog lights when the steering wheel is turned or the turn signal is engaged.
However, the introduction of HID and LED headlight technology changed this approach. Modern headlight assemblies often incorporate dedicated cornering lamps. In these cases, the cornering light function is controlled directly by the headlight control module (usually module 55 – J745 in the Mk7 Golf and likely similar in the 8V A3), rather than the BCM.
Addressing Leuchte Channel Confusion with 8V VCDS
While the BCM still contains adaptation channels for static cornering lights in vehicles with HID headlights, these settings might not directly control the cornering lamps within the headlight assembly. Specifically, “Leuchte12NL LB45” and “Leuchte13NL RB5” typically correspond to the left and right fog lights, respectively. Modifying these channels might not have the desired effect on cornering lamps integrated into HID or LED headlights.
Using 8V VCDS to analyze the factory adaptation map for vehicles with HID headlights often reveals the absence of “Abblendlicht links/rechts” (low beam left/right) commands within the static cornering light settings. This further supports the conclusion that the headlight control module, not the BCM, governs the cornering light function in these vehicles.
Conclusion: Utilizing 8V VCDS for Proper Diagnosis
When troubleshooting or modifying cornering light behavior in an 8V Audi A3 or similar MQB platform vehicle equipped with HID or LED headlights, it’s crucial to consult the factory wiring diagrams and adaptation maps using 8V VCDS. Focusing solely on BCM adaptation channels might lead to incorrect assumptions and ineffective modifications. Directly accessing the headlight control module with 8V VCDS is likely necessary for accurate diagnosis and adjustments. Understanding the distinct roles of the BCM and headlight control module is paramount for successful cornering light modifications.
