GMC 2007 Acadia Owner's Manual page 105

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 if your
vehicle has DIC buttons. See "REMOTE START"
under DIC Vehicle Customization (With DIC
Buttons) on page 255 for additional information. If
your vehicle does not have DIC buttons, see
your dealer/retailer to enable or disable the remote
vehicle start system.
Remote Start Ready
If your vehicle does not have the remote vehicle
start feature, it will have the remote start ready
feature. This feature allows your dealer/retailer to
add the manufacturer's remote vehicle start
feature.
See your dealer/retailer if you would like to add
the manufacturer's remote vehicle start feature to
your vehicle.
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