Volkswagen Golf GTI 2016, Owner'S Manual

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The safety belt warning light comes on for 6 seconds when the
ignition is switched on. A warning chime also sounds for up to
6 seconds if the driver's safety belt is not buckled. The chime stops
sooner if the driver buckles his or her safety belt. The warning light
and the chime go out when both driver and front passenger have
buckled their safety belts.
If the driver and front seat passenger do not both fasten their safety
belts within about 24 seconds after the chime stops and the vehicle
is moving at a speed of more than about 15 mph (25 km/h), the
chime will again sound for about 6 seconds, then go off for about
24 seconds, then sound again for about another 6 seconds. The
same thing happens if one of the safety belts is fastened and then
unfastened while the vehicle is moving. The safety belt warning
light also flashes. The warning chime continues to sound at
24 second intervals for up to 2 minutes. No chime sounds at speeds
of less than about 5 mph (8 km/h).
If the ignition is switched on, the safety belt warning light stays on
until the driver and front passenger have both buckled their safety
belts.