Mitsubishi LANCER Owner's Manual page 291

Features and controls
2. Lightly press the multi-information meter switch to select
" " (operation sound setting).
Type 1
3
Type 2
3-196
3. Press and hold the multi-information meter switch (for
about 2 seconds or more) to switch in sequence from ON
(operation sound on) → OFF (operation sound off) → ON
(operation sound on).
The setting is changed to the selected condition.
NOTE
If the battery is disconnected, the memory of the operation
sound setting is erased and is automatically set to "ON"
(operation sound on).
The operation sound setting only deactivates the operation
sound of the multi-information meter switch and rheostat
meter illumination button. The warning display and other
sounds cannot be deactivated.