I need to replace mine as well...it is more of a sickly wavering drunk-bumblebee type sound...I imagine it is just a simple piezo buzzer, I know that there have also been members to change it over to a dinging sound. The possibilities are endless!

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TC
Current stable:
- 2004 Mazda RALLYWANKEL
- 2007 Saturn sky redline
- 2004 Explorer...under surgery.

Past: 135i, GTI, 300E, 300SD, 300SD, Stealth