I’ve done the following to eliminate the external sound generation on a 2023 T8 recharge.
#359 EXTERIOR SOUND: Set to Not Available - but you must also use #371 as #359 won’t disable the sound by itself.
#371 EXTERIOR SOUND SYSTEM: Set to "Without" and use with #359. Used by itself it suppressed the low speed and reverse sounds, but generated an error message on startup (same as removing the external speaker fuse)
Unfortunately, after the 2.13 OTA update, the external sounds could no longer be disabled via these settings alone, but as a workaround I was able to remove the external speaker fuse and not get the “External Sound Malfunction” message each time I started the car.
#359 EXTERIOR SOUND: Set to Not Available - but you must also use #371 as #359 won’t disable the sound by itself.
#371 EXTERIOR SOUND SYSTEM: Set to "Without" and use with #359. Used by itself it suppressed the low speed and reverse sounds, but generated an error message on startup (same as removing the external speaker fuse)
Unfortunately, after the 2.13 OTA update, the external sounds could no longer be disabled via these settings alone, but as a workaround I was able to remove the external speaker fuse and not get the “External Sound Malfunction” message each time I started the car.