Lexus GS300 Start Stop Button Not Working, Possible Battery and Alternator Issue on Lexus GS300

Some Lexus GS300 owners report experiencing issues with the start-stop button not functioning properly. These problems may be linked to a weak or dead key fob battery, which can hinder the button's operation. Additionally, owners might need to check for necessary updates, such as the DCM Handshake update from the Lexus app, to resolve remote start issues as outlined in Service Bulletin L-SB-0006-19. The proximity of the key fob to the start button is also a factor, as it must be close enough for the vehicle to start. Furthermore, some owners find it helpful to inspect the circuit card and switches within the start-stop button for dust, defects, or wiring problems to identify the underlying cause. Addressing these concerns promptly can aid in restoring the functionality of the start-stop button.