2009 Lexus IS F Owners Manual - Page 496

If the electronic key does not operate properly n Unlocking and locking the doors To unlock or lock the vehicle, use the mechanical key to remove the lock cover on the driver's door handle. The mechanical key is stored inside the electronic key. 1 Unlocks 2 Locks Entering and Exiting Before Driving When Driving n Starting the engine Depress the brake pedal. Touch the Lexus emblem side of the electronic key to the "ENGINE START STOP" switch. Press the "ENGINE START STOP" switch within 10 seconds of the buzzer, keeping the brake pedal depressed. To change "ENGINE START STOP" switch modes, release the brake pedal and press the "ENGINE START STOP" switch within 10 seconds of the buzzer. Rain and Night Driving Driving Comfort Opening and Closing What to do if ...Customizing Your Lexus 54 If the electronic key battery becomes depleted, replace it with a new battery. For instructions on replacing the battery, refer to the Owner's Manual. If you need further assistance, contact your Lexus dealer.