Lexus RX300 vehicle won't start after key fob battery change with security light on on Lexus RX300

Some Lexus RX300 owners report experiencing starting issues after changing the key fob battery, particularly when the security light is illuminated. This problem may occur due to the security/immobilizer/anti-theft feature disabling the engine start, a common occurrence after a battery change. Additionally, owners have noted that issues such as a binding steering column, ignition switch problems, or ignition key malfunctions can also prevent the vehicle from starting. Battery failure, starter issues, or other related problems have been cited as potential causes for no-start conditions. To troubleshoot, some owners recommend checking the battery voltage, ensuring clean terminals and tight cables, and inspecting the starter. Restoring the fuel supply, charging the battery, or resetting the security system may also help resolve the issue. It is advisable for owners to consult a Lexus certified mechanic if these steps do not rectify the starting problem.