Chevrolet 1999 S10 Pickup Owner's Manual page 123

If the light flashes, the Passlock
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.
Service Four-Wheel-Drive Warning Light
R
system has entered a
This light should come on
briefly when you turn on the
ignition, as a check to show
you it is working.
The SERVICE 4WD light comes on to indicate that
there may be a problem with the four
system and service is required. Malfunctions can be
indicated by the system before any problem is apparent,
which may prevent serious damage to the vehicle. This
system is also designed to assist your service technician
in correctly diagnosing a malfunction.
Check Gages Light
yellowblue
- -
wheel drive
If this light comes on and
stays on while you are
driving, check your coolant
temperature and engine oil
pressure gages to see if they
are in the warning zones.
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