Mercedes-Benz S 500 2021–2022 — technical service bulletin
Bulletin LI8220P073452 · NHTSA communication 10205802 · issued Aug 9, 2021
Technical service bulletin
communication type
Electrical System
component
2021–2022
model years
7
vehicle entries
Official summary
The "Ambient Light Warning Assistance Inoperative" warning message is displayed in the instrument cluster and/or the lightemitting diode strips are not working.
Vehicles covered
What a TSB means. Technical service bulletins are repair guidance manufacturers send to dealers — they are not recalls, and repairs are not automatically free (warranty extensions are an exception worth checking). The full document is available via NHTSA’s vehicle lookup.