I wasn't trying to point you to a fix, it's just that the info you want, if it's anywhere, will be in the FSM.
I suspect you have a switch/sensor (door, pedal, shifter, seat, etc) that isn't acting right and the system doesn't think it needs an audible signal. The functional description of the chime system is where I'd start. I'd then go to the no-chimes diagnostics. If those both failed, I'd look at wiring diagrams. YMMV
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