Im not sure if this applies to a '92 but this worked on my '04 Taco:

Theres a blue connector under the dash that connects to the ignition switch. Its got a green wire with red stripe and a white wire with black stripe. Just unplug the connector with a pair of needle nose pliers and it kills the buzzer and your dome light will still come on when the doors open.

'04 Taco x-cab 3RZ FE stock (daily driver)
'90 x-cab 22RE stock
'82 Hilux 6" lift (ACES HI)
'82 2-Hiluxs' Rally Edition (parts)
'81 Hilux 3" lift (parts/restore)