Buick Century 2003 Owner's Manual page 244

4. Open the hoods and locate the batteries. Find the
positive (+) and negative (−) terminal location on
each vehicle. You will not need to access your
battery for jump starting. Your vehicle has a remote
positive (+) jump starting terminal for that purpose.
The terminal is located on the same side of the
engine compartment as your battery. See Engine
Compartment Overview on page 5-12 for more
information on location.
5-44
To uncover the remote positive (+) terminal,
squeeze the sides of the red plastic cap and pull
the cap upward. You should always use the remote
positive (+) terminal instead of the positive (+)
terminal on your battery.
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CAUTION:
An electric fan can start up even when the
engine is not running and can injure you. Keep
hands, clothing and tools away from any
underhood electric fan.