It's integral within the transmission.
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The backup light switch and the brake switch are all in the same relay switch. The backup light switch can be found beneath the drivers side dashboard.
The led light in the window switch is not replaceable. It is only serviced with the entire switch.
The 1997 Toyota Avalon stop light switch simply plugs in and out. Take hold of the stop light switch and pull outward. Plug the new stop light switch in.
John Henry Holmes did not invent the light switch! Light switches were in use well before his invention. What he invented was a light switch that did not develop a sustained arc on opening or closing, this arc would damage the switch contacts causing early failure. He used a design called "quick-break" that opened and closed the contacts much faster then earlier light switches.
There should be only two wire connections on the stop light switch. You need to put a constant 12v supply to one side of the switch and the light wire itself to the other side. The switch then needs to be adjusted so that the brake pedal holds the switch in to keep the lights off. When the pedal is depressed the lights will go on. If they stay on all the time, re-adjust the brake switch.