GMC 2002 Envoy - Manual (Page 156)

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Change Engine Oil Light
United States Canada
This light is displayed when the engine oil needs to
be changed.
Once the engine oil has been changed, the CHANGE
ENG OIL light must be reset. Until it is reset, the light
will be displayed when the engine is on. For more
information on resetting the system, see “Oil Life
System” in the Index.
Security Light
United States Canada
This light will come on briefly when you turn the
key toward START. The light will stay on until the
engine starts.
If the light flashes, the Passlock
R
system has entered a
tamper mode. If the vehicle fails to start, see “Passlock”
in the Index.
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.
Also, see “Content Theft - Deterrent” in the Index for
additional information regarding the SECURITY light.