An automatic transmission is an automobile gearbox that can change gear ratios automatically as the vehicle moves, freeing the driver from having to shift gears manually. Similar but larger devices are also used for heavy-duty commercial and industrial vehicles and equipment. The following Automatic Transmission system manual applies for Toyota Automobile series including Lexus ES300, GS300, LS400, SC300 & SC400 and Toyota Camry, Celica, Corolla, Land Cruiser, MR2, Paseo, Pickup, Supra, Tercel & 4Runner.
Transmission is equipped with a electronically controlled shift lock and key lock system. Shift lock system prevents shift lever from being moved from Park unless brake pedal is depressed. In case of a malfunction, shift lever can be released by
depressing shift lock override button, located near shift lever. Key lock system prevents ignition key from being moved from ACC to LOCK position on ignition switch unless shift lever is in Park.
Find more information about Automatic Transmission Toyota | Lexus Shift Lock System and its wiring diagram/electrical schematics in the following article – 19 pages of PDF file. (source: celicatech.com)