Ok my Lexus dosent beep but my Solara does but i dont think the volume is adjustable.

I don't have a Keyless master switch button...I do have a Keyless Volume ****.

Any other suggestions on getting this working?

There is a relay/doo-hickey inside the drivers door. (I cannot find the receipt to give you the part number) A sharp service writer or parts guy will know what it is. I even had an aftermarket remote installed thinking the OEM was toast then I found out it was this relay because the aftermarket one only opened the drivers door not the others because of this relay!!!!
If memory is correct it bolted to the latch assembly.
JU