This article provides information on how to code sequential turn signals for halogen tail lights on a MK7 platform using VCDS. While dynamic indicator modules are designed for LED tail lights, this coding allows for a unique sequential blinking pattern with halogen bulbs. The goal is to achieve a more noticeable turn signal by activating the lights in a specific sequence: inner square, inner L, outer square, and finally, the outer L.
Achieving Sequential Blinking with VCDS
The current setup allows for an alternating blinking pattern, as demonstrated in this video: https://youtu.be/layiwsIq1mk?t=23. However, the desired effect is a sequential activation. To achieve this, you’ll need to use VCDS (Vag-Com Diagnostic System) and adjust the coding within the Central Electrics module.
Accessing Central Electrics Module with VCDS
Begin by accessing the Central Electrics module in VCDS using the access code 31347. Then, navigate to the Adaptation menu. The following coding modifications need to be verified and potentially adjusted to achieve the desired sequential turn signal pattern. This coding applies to both the left and right tail lights, with specific adjustments for inner and outer sections.
Coding for Left Outer Tail Light
| Function | Value | Notes |
|---|---|---|
| Leuchte20BR LA71-Lasttyp | 20 35 | Recommended setting for LED bulbs (may need adjustment for halogen) |
| Leuchte20BR LA71-Lampendefekt… | 20 13 | |
| Leuchte20BR LA71-Fehlerort… | 20 3D | |
| Leuchte20BR LA71-Lichtfunktion A | 20 Bremslicht | Brake Light |
| Leuchte20BR LA71-Lichtfunktion B | 20 Blinken… | Left Turn Signal – Dark Phase (Off) |
| Leuchte20BR LA71-Dimmwert AB | 20 100 | |
| Leuchte20BR LA71-Lichtanste… | 20 Always | |
| Leuchte20BR LA71-Lichtfunktion C | 20 Standlicht… | Tail Light (Position Light) |
Coding for Right Outer Tail Light (Similar Structure to Left)
Adjustments for the right outer tail light follow a similar structure, using “Leuchte21BR RC8” as the base for function names. Ensure values are adjusted according to the right-side configuration. Specific values for “Lampendefektbitposition” and “Fehlerort mittleres Byte DTC-DFCC” will differ. Refer to the original coding for these specific values.
Coding for Inner Tail Lights (Left and Right)
Inner tail light coding uses “Leuchte23SL HLC10” for the left and “Leuchte24SL HRA65” for the right. Again, the structure remains similar to the outer tail light coding. Key functions like “Lasttyp,” “Lichtfunktion A” (Brake Light), “Lichtfunktion B” (Turn Signal), and “Lichtfunktion C” (Tail Light) should be present and configured correctly.
Achieving the Sequential Pattern
The provided coding establishes the foundation for individual light control. To achieve the desired sequential pattern, further adjustments within the adaptation channels related to “Blinken links Hellphase” (Left Turn Signal – Bright Phase) and “Blinken rechts Hellphase” (Right Turn Signal – Bright Phase) will likely be required. This involves precise timing control for each segment of the tail light to illuminate in the desired sequence. Experimentation and potentially consulting resources specific to MK7 tail light coding may be necessary. This guide provides a starting point for customizing your MK7’s turn signals.
