Buick 2010 Lucerne Owner's Manual page 198

If it does not, have the vehicle serviced by your dealer.
If the system is working normally the indicator light then
goes off.
4-38
For vehicles with a
Traction Control System
®
(TCS) and StabiliTrak
warning light, this light
comes on briefly when the
engine is started.
When the system is active, the light flashes while the
system is limiting wheel spin or assisting with controlling
the vehicle.
If it stays on or comes on while driving a SERVICE
TRACTION CONTROL message appears in the Driver
Information Center (DIC). This indicates that there
could be a problem with the traction control system
and the vehicle may need service. When this warning
light is on and the SERVICE TRACTION CONTROL
message appears on the DIC, the system does not limit
wheel spin.
If the traction control system is manually turned off, this
light comes on and the TRACTION CONTROL OFF
message appears on the DIC.
See Traction Control System (TCS) on page 5 6 and
DIC Warnings and Messages on page 4 55 for more
information.