1. The document describes the components and operation of a smart entry and start system used in Toyota vehicles. It details the key fob, antenna locations, control modules and circuits involved in remote locking, unlocking, engine starting and other functions.
2. The system uses transponder technology and radio frequency signals to detect the presence of the key fob and authorize various functions when the fob is within range. It allows drivers to operate doors, trunk and start the engine without inserting a key.
3. Troubleshooting procedures are outlined, including checking for faults in communication networks and control modules. The importance of fully-charged key fob batteries and avoiding sources of radio interference are also emphasized.