Chevrolet 2000 Cavalier Owner's Manual page 140

If the light comes on continuously while driving and
stays on, there may be a problem with the Passlock
system. Your vehicle will not be protected by Passlock,
and you should see your dealer.
On vehicles equipped with remote keyless entry, the
Passlock warning light will flash to indicate that the
security system is active when the ignition is OFF
and the security system is armed.
Up-Shift Light (Manual Transaxle)
United States Only
2-76
This light comes on when
you need to shift to the next
higher gear. See "Manual
Transaxle" in the Index.
Check Gages Light
United States
This light will come on briefly when you are starting
the engine. If it comes on and stays on while you are
driving, check your various gages to see if they are in
the warning zones or if you are low on fuel.
See "Engine Coolant Temperature Gage" and
"Fuel Gage" in this section for more information.
Canada