Buick LaCrosse Owner's Manual page 433

For more information about the
vehicle battery, see
.
If the battery has run down, try to
use another vehicle and some
jumper cables to start your vehicle.
Be sure to use the following steps to
do it safely.
Batteries can hurt you. They can
be dangerous because:
They contain acid that can
burn you.
They contain gas that can
explode or ignite.
They contain enough
electricity to burn you.
If you do not follow these steps
exactly, some or all of these
things can hurt you.
The jump start positive is located
under a trim cover in the engine
compartment on the driver side of
the vehicle.