Power Source Mode does not Change: Description

When the engine switch is pushed with the electrical key in the cabin, the power source control ECU receives signals to switch the power source mode.

HINT: 

To allow use of the Techstream to inspect the push-button start function when the engine switch is off, repeat opening and closing any of the doors. Opening and closing a door establishes communication between the Techstream and the power source control ECU. (Opening and closing a door can also be duplicated by operating a door courtesy light switch.)