GMC 2001 Safari Owner's Manual page 155

Tow/Haul Light
For more information, see "Tow/Haul Mode" in
the Index.
2-76
This light should come on
when the tow/haul mode has
been selected.
Check Gages Light
If the light comes on and stays on while you are driving,
check your various gages to see if they are in the
warning zones.
This light will come on
briefly when you are
starting the engine.