GMC 1999 Jimmy Owner's Manual page 148

NOTICE:
Damage to your engine from neglected oil
problems can be costly and is not covered by
your warranty.
Oil pressure may vary with engine speed, outside
temperature and oil viscosity, but readings above the
low pressure zone indicate the normal operating range.
A reading in the low pressure zone may be caused by a
dangerously low oil level or other problems causing low
oil pressure.
Security Warning Light
If the light flashes, the Passlock
tamper mode. If the vehicle fails to start, see "Passlock"
in the Index.
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This light will come on
briefly when you turn the
key toward START. The
light will stay on until the
engine starts.
R
system has entered a
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.
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Also see "Content Theft Deterrent" in the Index for
additional information regarding the SECURITY light.
Service Four-Wheel-Drive Warning Light
(If Equipped)
The SERVICE 4WD light comes on to indicate that
there may be a problem with the drive 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.
This light should come on
briefly when you turn on the
ignition, as a check to show
you it is working.
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