A back-up beeper is designed to be heard outside so it may be a little loud in the passenger compartment. You could always muffle the sound with foam rubber. It also depends on what you mean by "different." Tone? Pitch? Loudness? Beep rate?

Changing the sound might be possible if you put a resistor in series with the power lead. The size (ohms and watts) will depend on how much current the beeper draws, which I do not know. You will have to experiment.

If the beeper is a simple mechanical buzzer, it might have a tuning screw. If it is entirely electronic, one of the internal components might affect the pitch of the sound but that would take some experimentation. Probably easier to get another beeper than to rebuild this one.

Jeremy

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"Buster" in the '95

Our all-Diesel family
1996 E300D (W210) . .338,000 miles Wife's car
2005 E320 CDI . . 113,000 miles My car
Santa Rosa population 176,762 (2022)
Total. . . . . . . . . . . . 627,762
"Oh lord won't you buy me a Mercedes Benz."
-- Janis Joplin, October 1, 1970