Flashing lights under hard braking
COMMUNITY-SOURCED · MK6 · LIGHTING
The brake lights and/or turn signals flash during a panic stop.
Applies to
VW Golf / GTI / Golf R Mk6 (5K), 2010 on.
Not confirmed for
Jetta sedan/GLI 2011-2018 (different body module), Jetta SportWagen, Tiguan, Eos, CC
Module
09 Central Electronics (BCM). BCM PQ35 (5K0 937 08x), label file 1K0-937-08x-09.clb.
Method
Long coding
1 · Before you start
Run a full Auto-Scan and save it. Copy the whole long coding string of 09 Central Electronics (BCM) and keep it somewhere safe.
2 · VCDS
Unlock all doors before connecting.
Select 09 Central Electronics > Coding - 07 > Long Coding Helper.
Byte 16, Bit 1: tick 'Emergency Brake Flashing via Brake Lights active' (flashes the brake lights), and/or
Byte 16, Bit 2: tick 'Emergency Brake Flashing via Turn Signals active' (flashes the turn signals).
What this changes
No light slot is reassigned, but it changes how the existing brake lights and/or turn signals behave in a panic stop (they flash instead of staying steady). Check local lighting laws.
Notes
Ross-Tech: it only activates under panic-stop conditions. The label file also has Byte 27 Bit 5 'Emergency Brake Flashing active with Trailer attached' (not covered by sources). Ross-Tech links a VWVortex thread 'Emergency Brake Feature with LED tails', which couldn't be read. Source coverage: vag-coding.net (Golf 6 5K); SVicksTC (Mk6 GTI); Ross-Tech 5K (label only); vagcode.info label decode (label evidence only).
Sources: vag-coding.net · vagcode.info · pdfcoffee.com · wiki.ross-tech.com
Reference only. No guarantee of compatibility. MK6IX doesn’t answer coding questions or troubleshoot coding. Back up your original coding before making any change. You code your car at your own risk.