Lexus IS250 U Owner's Manual page 339

In other situations

Even though all conceivable measures have been taken, the symptom status does not
change.
The cellular phone is not close enough to this system.
 Bring the cellular phone closer to this system.
Radio interference has occurred.
 Turn off Wi-Fi devices or other devices that may emit radio waves.
The cellular phone is the most likely cause of the symptom.
 Turn the cellular phone off, remove and reinstall the battery pack, and then
restart the cellular phone.
 Enable the cellular phone's Bluetooth
 Disable the Wi-Fi connection of the cellular phone.
 Stop the cellular phone's security software and close all applications.
 Before using an application installed on the cellular phone, carefully check its
source and how its operation might affect this system.
IS350/250_U (OM53C50U)
5-11. Bluetooth
®
connection.
339
®
5