VW Golf MK7 (5G): cup holder ambient light coding & wiring

How to retrofit DIY cup holder #ambient lights & front cubby #LED illumination, enable it with OBDeleven or VCDS in #VW Golf MK7, including coming/leaving home illumination and slider controls from Volkswagen Discover infotainment system screen. This is not just a piggyback connection to footwell lights or dashboard backlight. This was wired as independent BCM (body control module) circuit, coded with it's own controls, brightness, and logic.

ℹ️ This tutorial is based on my own research and documentation that I found related to Audi A3 8V with interior lighting package. Same procedure should work for all other MQB platform vehicles, including Seat Leon MK3 (5F), Skoda Octavia 3 (5E). This tutorial might not be 100% accurate and may be updated in future. Some coding and adaptation changes might differ because of the production year, software versions, or vehicle trim version. Required coding procedure might be adjusted for facelift vehicles.

⚠️ Warning! You are doing this modification at your own risk. This modification may void your cars warranty. This modification might cause vehicle damage. Any modification to the electrical system are potentially dangerous and might end with electrical fire.

🛒 Parts
Extra thin LED strip (White 6500K): https://s.click.aliexpress.com/e/_DERWotr
BCM terminal: https://s.click.aliexpress.com/e/_DBR214Z
Isolation tape: https://s.click.aliexpress.com/e/_DFKMDIl
Wires, zip ties.

🛠 Tools
Diagnostic computer (VCDS or OBDeleven: http://mr-fix.info/redirect/obdeleven )
Torx and flat drivers
Prying tools: https://ali4cars.com/product/interior-removal-toolset
Terminal crimping tool
Cutter and precise knife

📺 Related videos that you should watch first
VW Golf MK7 cabin fusebox location: https://youtu.be/mw4wC7yznSI
VW Golf MK7 Rear USB ports retrofit: https://youtu.be/tLZcmenU7Pw
VW Golf MK7 footwell lights wiring: https://youtu.be/XTiLrowY7Z0
VW Golf MK7 RVC High wiring: https://youtu.be/oYKR06io0nM

🔌 Wiring connection
Ground to any chassis ground point.
Positive to empty and active pin in BCM. In my case that's plug C, pin 9.

💻 Coding and Adaptation
Module 5F (Security Access: 20103) → Adaptation:
→ Car Function list BAP Gen2:
→ → Interieur light 0x08 → Activated
→ → Interieur light 0x08 msg bus → Comfort data bus
→ Car Function adaptatations Gen2
→ → menu display ambient illum. → activated
→ → menu display ambient illum. over threshold high → activated

Module 09 (Security Access: 31347):
→ Long Coding → Byte 17 → bit 2 (Ambient Cupholder Lights) → installed
→ Adaptation:
→ → Interior light, light configuration → Cockpitbeleuchtung → installed
→ → Int. light, 2nd generation → Aufloesung dimmzeit → 0.1s
→ → Int. light, 2nd generation → Helligkeit Cockpitbeleuchtung nicht berechnen → not active

Module 09 (Security Access: 31347) → Adaptation → LeuchteXX
→ Lasttyp → 46 - LED Kleinleistung
→ Lichtfunktion A → Ambientelicht 2
→ Dimmwert AB → 100(%)
→ Lichtansteuerung HD AB → Always

Module 09 (Security Access: 31347) → Adaptation → Interior lighting, parameter:
→ P t * cockpit → 0 (s)
→ P adaption kundenwunch cockpit → 14
→ P helligkeit Fzg geschlossen zuendung ein cockpit → 126%
→ P helligkeit * cockpit → change all with default 100% to 25%

🛒 Buy OBDeleven here (ref): http://mr-fix.info/redirect/obdeleven

0:00 Golf MK7 cup holder with coming/leaving home
0:33 Prepared for coding with OBDeleven or VCDS
1:20 Cup holder light stripe and BCM terminal
1:50 BCM (body control module) location
2:25 Tools required
2:50 dashboard and center console disassembly
3:48 adding wiring to BCM connectors
4:22 Advantages of separate wiring circuit for cup holder
5:10 BCM connectors A, B, and C
5:25 finding empty and programable channel with OBDeleven
7:40 checking pin assigned to adaptation channel
8:40 test setup for cup holder (lasttyp, lichtfunktion, dimmwert)
11:03 proper coding of the Leuchte channel for ambient lights
12:10 checking MIB infotainment adaptation
13:20 enabling slider control for front background light
16:05 brightness adjustment for safety and comfort
19:05 time delays explained
20:15 confirm proper brightness in live data
21:25 cup holder lights demo at night

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