Audi A8 2019 Service Training page 71

Illuminated seat belt buckles
Introduction
Illuminated seat belt buckles are standard on the A8 and
help the vehicle occupants to locate their seat belt buckle
in the dark.
The illuminated seat belt buckles are installed at the front
and rear on the driver and front passenger sides. Vehicle
Electrical System Control Module J519 is responsible for
the illumination. For this reason, J519 is discretely wired to
the seat belt buckle lighting units. For further information
about the illumination function of the seat belt buckles (for
example, switch-on point, run-on time etc.), please refer to
eSelf-Study Program 970293, The 2019 Audi A8 Electrics
and Electronics.
Design of the lighting unit
Optical fiber
Luminous ring
Cap
Seat belt buckle
The actual seat belt function is unchanged. This means that
the seat belt buckles are still a component part of the
occupant protection system and are wired to Airbag Control
Module J234.
Illuminated seat belt buckles require four-pin electrical
plugs instead of two.
LED unit with housing
Cable with
4-pin plug
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