Hummer H2 2009 Owner's Manual page 95

If the vehicle is left running it will automatically shut off
after 10 minutes unless a time extension has been done.
To manually shut off a remote start:
•
Aim the RKE transmitter at the vehicle and press
the remote start button until the parking lamps
turn off.
•
Turn on the hazard warning flashers.
•
Turn the ignition switch on and then off.
The vehicle can be remote started two separate times
between driving sequences. The engine will run for
10 minutes after each remote start.
Or, you can extend the engine run time by another
10 minutes within the first 10 minute remote start time
frame, and before the engine stops.
For example, if the lock button and then the remote
start buttons are pressed again after the vehicle
has been running for five minutes, 10 minutes are
added, allowing the engine to run for 15 minutes.
The additional ten minutes are considered a second
remote vehicle start.
Once two remote starts, or a single remote start with
one time extension has been done, the vehicle must
be started with the key. After the key is removed from
the ignition, the vehicle can be remote started again.
The vehicle cannot be remote started if the key is in
the ignition, the hood is not closed, or if there is
an emission control system malfunction.
Also, the engine will turn off during a remote vehicle
start if the coolant temperature gets too high or if the
oil pressure gets low.
Vehicles that have the remote vehicle start feature are
shipped from the factory with the remote vehicle start
system enabled. The system may be enabled or disabled
through the DIC. See "REMOTE START" under DIC
Vehicle Customization on page 3-64 for additional
information. If your vehicle does not have DIC buttons,
see your dealer/retailer to enable or disable the remote
vehicle start system.
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