See also:

Channel preset
...

Brake booster
The brake booster uses engine manifold vacuum to assist braking force. Do not turn off the engine while driving because that will turn off the brake booster, resulting in poor braking power. The ...

Traction Control OFF indicator light (green – STI)
The light illuminates when the Vehicle Dynamics Control mode switch is pressed briefly. For details, refer to “Traction mode”. ...