To unlock a 2007 Lexus IS250 with a dead battery, use the physical key hidden inside the key fob. Press the release button on the fob to access the key, then insert it into the driver’s door lock to unlock the door manually. Once inside, you can access the hood and jump-start the battery or replace it to restore electrical function.
To program the door handle to open all four doors on a 2008 Lexus IS250, first, ensure that the vehicle is in the "On" position but the engine is not running. Then, press and hold the unlock button on the key fob while simultaneously pressing the lock button three times. Release both buttons and the doors should now be programmed to unlock all at once when using the door handle or key fob. Always consult your owner’s manual for specific instructions or variations.
To restart a Lexus IS250 after recharging the battery, first ensure that all electrical accessories are turned off. Insert the key fob into the ignition slot (or have it inside the vehicle if it’s a keyless model) and press the brake pedal. Then, turn the ignition key to the "Start" position or press the "Start" button. The engine should start, but if it doesn’t, check the battery connections and ensure they are secure.
How do you program a key fob to a 2003 Chevy Malibu
To program any kind of key fob you have to take it to a dealership.
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How do I re program my key fob for renault laguna estate 1997?
Open the key fob, remove the battery and look and see what size it is.
To add a new key fob, take the vehicle and the key fob to an authorized dealer. To re-program a key fob after replacing it's battery, open the key fob, then read and follow the instructions inside.
http://www.ehow.com/how_7456283_program-key-fob-harley-davidson.html
The key fob programing requires the dealer's scan tool.