It is on because the computer has detected a malfunction and set a trouble code. See related question below.
Where is the oil filter in a 2004 Chevy Malibu
How many motor mounts in 2004 Chevy Malibu?
it means your car needs a service
no
2004 Malibu has fuse box in the trunk. You will find the tail light fuse in there. 10 Amp fuse all the way to the rear, just under a much larger fuse.
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the switch is on top back side of brake pedal.
2004 chevy mailibu starter location
Where is the power steering pump located for 2004 malibu
Wath timing 2.2 malibu 2004
There is no user serviceable filter in 2004 to 2007 Chevy Malibu Maxx.
Yes. '97-'05 the same.