Toyota 2009 Corolla Owner's Manual page 339

Battery
Check the battery as follows.
Battery exterior
n
Make sure that the battery terminals are not corroded and that
there are no loose connections, cracks, or loose clamps.
Checking battery fluid
n
Check the battery condition using the indicator color.
Type A
4-3. Do-it-yourself maintenance
Terminals
Hold-down clamp
Ground cable
Blue: Good condition
White: Charging is necessary.
Have the vehicle inspected by
your Toyota dealer.
Red: Not working properly.
Have the vehicle checked by
your Toyota dealer.
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