When braking in an emergency the hazard lights flash to warn traffic following behind.
This feature can be turned on and off in Vagcom/VCDS using Byte 17 Bit 0.
For the lights to flash the following parameters must be met
- Deaceleration has to be higher then 7m/s² and
- for a duration longer then 700ms or
- the ABS must be active for more then 2 seconds.
Once one or both of these requirements are met the indicator lights will flash until until the paramters are no longer met.