Page 204 of 528

Black plate (18,1)Cadillac STS Owner Manual - 2011
Engaging Adaptive Cruise Control With the
Set Button
{WARNING:
If you operate Adaptive Cruise Control without
your Head-up Display (HUD) properly adjusted,
your Adaptive Cruise Control settings may not be
visible. You could forget your settings and be
startled by Adaptive Cruise Control response
and even lose control. Keep your HUD on and
properly adjusted when using Adaptive Cruise
Control.
If the cruise button is on when not in use, it could get
bumped and go into cruise when not desired. Keep the
cruise control switch off when cruise is not being used.
The set speed is selected by the driver. This is the
speed you will travel if there is no vehicle detected in
your path. To set Adaptive Cruise Control, do the following:
1. Make sure the Head-Up Display (HUD) is on and properly adjusted. You cannot engage Adaptive
Cruise Control unless the HUD is on. See Head-Up
Display (HUD)
on page 4‑38for more information.
2. Move the switch to on.
3. Get up to the desired speed.
4. Press
Tat the end of the lever and release it.
5. Take your foot off the accelerator pedal.
Once Adaptive Cruise Control is set, it might
immediately apply the brakes if it detects a vehicle
ahead that is too close or moving slower than your
vehicle.
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Page 205 of 528

Black plate (19,1)Cadillac STS Owner Manual - 2011
United States version
shown, Canada similar This symbol appears on
the Head-Up Display
(HUD) to indicate that
Adaptive Cruise Control
is active. The number
indicates the set speed.
See Head-Up Display (HUD)
on page 4‑38for more
information.
Make sure the set speed is visible on the HUD so you
know the speed your vehicle will accelerate to if a
vehicle is not detected in your path. Keep in mind
speed limits, surrounding traffic speeds, and weather
conditions when adjusting your set speed.
If your vehicle is in Adaptive Cruise Control when the
traction control system begins to limit wheel spin, the
Adaptive Cruise Control will automatically disengage.
See Traction Control System (TCS)
on page 5‑9,
StabiliTrak®Systemon page 5‑6or Enhanced
StabiliTrak®on page 5‑7. When road conditions allow
you to safely use it again, the Adaptive Cruise Control
can be turned back on.
Resuming a Set Speed
If the Adaptive Cruise Control is set at a desired speed
and then the brakes are applied, the adaptive cruise
control is disengaged without erasing the set speed
from memory.
Once the vehicle reaches about 48 km/h (30 mph) or
more, move the Adaptive Cruise Control switch briefly
from
RtoS. The vehicle returns to the previous set
speed and stays there.
Increasing Set Speed While Using Adaptive
Cruise Control
If the Adaptive Cruise Control system is already
activated,
.PressTat the end of the lever until the desired
speed is reached, then release it and the
accelerator pedal.
.Move the Adaptive Cruise Control switch
from
RtoS. Hold it there until the desired set
speed is displayed in the HUD, then release the
switch.
4-19
Page 207 of 528

Black plate (21,1)Cadillac STS Owner Manual - 2011
The range of selectable distances may not be
appropriate for all drivers and driving conditions. If you
prefer to travel at a following distance farther than
Adaptive Cruise Control allows, disengage the system
and drive manually.
United States version
shown, Canada similar A graphic on the HUD
indicates the selected
following distance. This
picture shows a maximum
follow distance.
The vehicles will move closer together as you select a
smaller following distance.
Alerting the Driver
The alert symbol flashes
on the HUD and a
warning beep sounds
when driver action is
required. Driver action is required when:
.Adaptive Cruise Control cannot apply sufficient
braking because you are approaching a vehicle too
rapidly.
.The vehicle speed drops below about 40 km/h
(25 mph).
.A temporary condition prohibits Adaptive Cruise
Control from operating. See
DIC Warnings and
Messages
on page 4‑76for more information.
.A malfunction is detected in the system. See DIC
Warnings and Messageson page 4‑76for more
information.
See Defensive Driving on page 5‑2.
{WARNING:
Adaptive Cruise Control has only limited braking
ability to slow your vehicle. In some cases,
Adaptive Cruise Control may not have time to
slow your vehicle enough to avoid a collision.
Be ready to take action and apply the brakes
yourself. See Defensive Driving on page 5‑2.
4-21
Page 208 of 528

Black plate (22,1)Cadillac STS Owner Manual - 2011
Approaching and Following a Vehicle
The vehicle ahead symbol only appears on the HUD
when a vehicle ahead is detected in your path.
If this symbol does not appear, or disappears briefly,
Adaptive Cruise Control will not respond to vehicles you
may see ahead.
{WARNING:
When the Adaptive Cruise Control radar is
blocked by snow, ice, or dirt, it may not detect a
vehicle ahead. Adaptive Cruise Control may not
have time to slow your vehicle enough to avoid a
collision. Do not use Adaptive Cruise Control
when the radar is blocked by snow, ice, or dirt.
Keep your radar clean. See“Cleaning the
System” later in this section.
Adaptive Cruise Control automatically slows your
vehicle down when approaching a slower moving
vehicle. It then adjusts your speed to follow the vehicle
in front at the selected following distance. Your speed
increases or decreases to follow the vehicle in front of
you but will not exceed the set speed. It may apply
limited braking, if necessary. When braking is active,
your brake lights come on. It may feel or sound different
than if you were applying the brakes yourself. This is
normal.
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Page 209 of 528

Black plate (23,1)Cadillac STS Owner Manual - 2011
Stationary or Very Slow-Moving Objects
{WARNING:
Adaptive Cruise Control may not detect and
react to stationary or slow‐moving vehicles or
other objects ahead of you. You could crash into
an object ahead of you. Do not use Adaptive
Cruise Control when approaching stationary or
slow‐moving vehicles or other objects.
{WARNING:
Adaptive Cruise Control may not detect and react
to stationary or slow-moving vehicles or other
objects ahead of you. Your vehicle may accelerate
toward objects, such as a stopped vehicle that
suddenly appears after the lead vehicle changes
lanes. Your complete attention is always required
while driving and you should be ready to take
action and apply the brakes.
Low-Speed Deactivation
If your speed falls below 40 km/h (25 mph) while
following a vehicle ahead, Adaptive Cruise Control will
begin to disengage. The driver alert symbol on the HUD
will flash and the warning beep will sound. The driver
must take action since Adaptive Cruise Control will not
slow the vehicle to a stop.
Deactivation When Head-Up Display is
Turned Off
If the HUD is turned off when Adaptive Cruise Control is
engaged, it will begin to disengage. A warning beep
sounds and the message RADAR CRUISE NOT
READY appears on the Driver Information Center (DIC).
SeeDIC Warnings and Messages
on page 4‑76for
additional information. If Adaptive Cruise Control was
braking when the HUD is turned off, the braking will
continue briefly.
4-23
Page 210 of 528

Black plate (24,1)Cadillac STS Owner Manual - 2011
Passing a Vehicle/Adaptive Cruise Control
Override
To increase speed to pass a vehicle, use the
accelerator pedal. While you are doing this, the system
will not automatically apply the brakes. A PEDAL
APPLIED ACC OVERRIDE message will appear on the
HUD. SeeHead-Up Display (HUD)
on page 4‑38for
additional information. Once you pass the vehicle and
remove your foot from the accelerator pedal, Adaptive
Cruise Control returns to normal operation and the
brakes can be applied, if needed.
{WARNING:
If you rest your foot on the accelerator pedal, the
system will not automatically apply the brakes.
You could crash into a vehicle ahead of you. Do
not rest your foot on the accelerator pedal when
using Adaptive Cruise Control.
Curves in the Road
{WARNING:
Due to Adaptive Cruise Control limitations in
curves, it may respond to a vehicle in another
lane, or may not have time to react to a vehicle in
your lane. You could crash into a vehicle ahead of
you, or lose control of your vehicle. Give extra
attention in curves and be ready to use the brakes
if necessary. Select an appropriate speed while
driving in curves.
Adaptive Cruise Control might operate differently in a
sharp curve. It might reduce your speed if the curve is
too sharp.
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Page 211 of 528
Black plate (25,1)Cadillac STS Owner Manual - 2011
When following a vehicle and entering a curve,
Adaptive Cruise Control could lose track of the vehicle
in your lane and your vehicle could accelerate. When
this happens, the vehicle ahead symbol will not appear
on the HUD.Adaptive Cruise Control might detect a vehicle that is
not in your lane and apply the brakes.
Adaptive Cruise Control might occasionally
provide a driver alert and/or braking that you consider
unnecessary. It could respond to signs, guardrails, and
other stationary objects when entering or exiting a
curve. This is normal operation. Your vehicle does not
need service.
4-25
Page 212 of 528

Black plate (26,1)Cadillac STS Owner Manual - 2011
Highway Exit Ramps
{WARNING:
Adaptive Cruise Control may lose track of the
vehicle ahead and accelerate up to your set
speed while entering or on highway exit ramps.
You could be startled by this acceleration and
even lose control of the vehicle. Disengage
Adaptive Cruise Control before entering a
highway exit ramp. Do not use Adaptive Cruise
Control while entering or on exit ramps.
Other Vehicle Lane Changes
If another vehicle enters the same lane as you,
Adaptive Cruise Control will not detect the vehicle until
it is completely in the lane. Be ready to take action and
apply the brakes yourself.
Using Adaptive Cruise Controls on Hills
and When Towing a Trailer
How well Adaptive Cruise Control works on hills
and while a trailer is being towed depends on your
vehicle speed, vehicle load, traffic conditions, and the
steepness of the hills. It might not detect a vehicle in
your lane while driving on hills. While going up steep
hills, you might want to use the accelerator pedal to
maintain your vehicle speed. While going downhill and
towing a trailer, you might might have to brake to keep
the vehicle speed down. When the brakes are applied
the cruise control is disengaged. You may choose not to
use Adaptive Cruise Control on steep hills when towing
a trailer.
Disengaging Adaptive Cruise Control
Apply the brake pedal or move the Adaptive Cruise
Control switch to off, to disengage the system. Adaptive
Cruise Control information does not appear on the HUD
while the system is not engaged.
4-26