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 authorize operation based on detection of a valid key within range. Various control units coordinate functions and provide diagnostic indicators through the engine switch.
3. Troubleshooting procedures involve verifying battery voltage, checking for diagnostic trouble codes relating to communication faults, and analyzing driver reports before potentially replacing modules or keys if issues arise. Basic service points are also outlined to prevent interference and ensure proper detection range.