Buick Lucerne 2007 Owner's Manual page 101

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 10 minutes are considered a
second remote vehicle start.
Once two remote starts, or a single remote start
with one time extension have been done, the
vehicle must be started with the key.
After the key is removed from the ignition, another
remote start can be performed.
The vehicle cannot be started remotely if the key
is in the ignition, the hood is not closed, or if
there is an emission control system malfunction.
Remote Start Ready
If your vehicle does not have the remote vehicle
start feature, it may have the remote start
ready feature. This feature allows your dealer to
add the manufacturer's remote vehicle start
feature.
If your vehicle has the remote start ready feature,
your RKE transmitter will have extended range
that will allow you to lock or unlock your vehicle
from about 195 feet (60 m) away.
See your dealer if you would like to add the
manufacturer's remote vehicle start feature to your
vehicle.
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