03 lin l s turn key on to start does nothing not starter or battery

Do the headlights come on? This is independent of the key. If not, you have a supply problem (fusible link, open circuit battery, etc...). Measure the voltage on the battery if you can (should be 11.5-12.5 volts DC). If lower, replace or charge the battery. If the headlights come on, then you have an ignition issue (security system, most vehicles have a transponder in the key to stop "hot-wiring" a car, or still could be a fusible link (a wire from the battery to the starter designed to fail if too much current is drawn), ignition switch, park/neutral switch (car must be in park or neutral to start)). Although if the park/neutral switch, usually all other ignition based items work fine, it just won't start.