Security Light; Service Four-Wheel Drive Warning Light - GMC 2003 Sonoma Owner's Manual

Security Light

If the light flashes, the Passlock
tamper mode. If the vehicle fails to start, see Passlock
on page 2-17 .
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 on page 2-16 for
additional information regarding the SECURITY light.
This light will come on
briefly when you turn the
key toward START.
The light will stay on until
the engine starts.
®
system has entered a
®
Service Four-Wheel Drive
Warning Light
®
The SERVICE 4WD light comes on to indicate that
there may be a problem with the four-wheel 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.
If you have this light, it
should come on briefly
when you turn on the
ignition, as a check
to show you it is working.
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