GMC 1996 Sierra Owner's Manual page 129

Daytime Running Lamps Indicator Light
Check Gages Light
This light goes on whenever
the DRL are on.
CHECK
GAGES
This light will come on
briefly when you are
starting the engine.
When
it
begins to get dark, the DRL indicator light is a
reminder to turn on your headlamps.
If
the light comes on and stays
on w.hile you are driving,
it
could indicate a problem with your vehicle. It could be
a problem with your oil pressure, coolant temperature,
or some other problem. Check your various gages to see
if they are in the warning zones. If they are, have your
vehicle serviced right away.
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