While I always were a seat belt, I don't like the nanny chime, especially when I'm just meandering around the neighborhood. So I want to deactivate it.

Here's the procedure, the second of which applies to my set-up.

How to disable seat belt warning with Star diganosis | MBStarTool.com Official Blog

However, when I select deactivate under Special Functions, nothing happens. I've tried it both with and without the engine running.

Am I missing something?

Elsewhere in the menu structure there is a long menu with several options having to do with the seat belt. But it's all in German so I'm not going to experiment.

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14 E250 Bluetec 4Matic "Sinclair", Palladium Silver on Black, 154k miles
06 E320 CDI "Rutherford", Black on Tan, 172k mi, Stage 1 tune, tuned TCU
91 300D "Otis", Smoke Silver on Tan, 142k mi, wastegate conversion, ALDA delete

19 Honda CR-V EX 61k mi
Fourteen other MB's owned and sold
1961 Very Tolerant Wife