GMC 2010 T-Series Owner's Manual page 52

The ENGINE SHUTDOWN WARNING LIGHT will come
on and a continuous chime will alert the driver
30 seconds before the engine goes into idle shutdown
mode. The engine shutdown warning light and chime
will stay on for the entire duration of the idle shutdown
event to inform the driver that the engine is in idle
shutdown mode. See Engine Shutdown Warning Light
on page 3 35 for more information.
After the engine shutdown occurs, the engine is no
longer running, and the ignition is still in the ON/RUN
position, all accessories can be used. Turn the ignition
switch to START to restart the engine or turn it to
LOCK/OFF to prevent the battery from draining.
2-12
High Idle System
Manual High Idle System
This system can be used to increase engine idle speed
whenever the following conditions are met:
The brake pedal is not pressed.
The vehicle is at a complete stop.
The manual transmission clutch pedal is not
pressed or, the automatic transmission is in
N (Neutral) or P (Park).
The manual high idle feature is activated by pressing
the button on the instrument panel. When the button is
pressed again, or any of the previous conditions are not
met, manual high idle will be deactivated.
If the vehicle has this
feature, the manual high
idle button is located in
the instrument panel. See
Instrument Panel
Overview on page 3 4
Instrument Panel
Overview for more
information.