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2004 silverado

best buy installed it, i tried to call them but tey were no help.so im not sure if they installed one or not.

the beeping happens when i open my door and the key is in the ignition.

Thank you for the added info.................
2004 "typically" needs a Wiring Adapter to maintain the Door Chime thru the Speaker, as the Factory Radio is a Class 2 DATA Type Radio & the Wiring Adapter takes it's place.
That said, it is going to depend on "IF" the Wiring Adapter used has the "Volume" Adjustment on it
You can remove the Front Dash Panel (pretty easy), to inspect the Wiring Adapter for the Volume Control (small screw driver to turn) or wait to call Best Buy for them to tell you.
Since the signal is coming from the BCM, I would not like to see any Factory wires cut
If the older Wiring Adater is used, you could install the New Type (apprx $35.00), that has the Volume Control

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