Page 1 of 420

Seats and Restraint Systems........................... 1-1
Front Seats
............................................... 1-2
Rear Seats
............................................... 1-6
Safety Belts
.............................................. 1-7
Child Restraints
.......................................1-28
Airbag System
.........................................1-48
Restraint System Check
............................1-58
Features and Controls..................................... 2-1
Keys
........................................................ 2-3
Doors and Locks
....................................... 2-9
Windows
.................................................2-15
Theft-Deterrent Systems
............................2-19
Starting and Operating Your Vehicle
...........2-24
Mirrors
....................................................2-37
OnStar
®System
......................................2-42
HomeLink®Wireless Control System
...........2-44
Storage Areas
.........................................2-49
Sunroof
..................................................2-52
Vehicle Personalization
.............................2-53
Instrument Panel............................................. 3-1
Instrument Panel Overview
.......................... 3-4
Climate Controls
......................................3-30
Warning Lights, Gages, and Indicators
........3-40
Driver Information Center (DIC)
..................3-57Trip Computer
.........................................3-79
Audio System(s)
.......................................3-80
Driving Your Vehicle....................................... 4-1
Your Driving, the Road, and Your Vehicle
........ 4-2
Towing
...................................................4-35
Service and Appearance Care.......................... 5-1
Service
..................................................... 5-3
Fuel
......................................................... 5-5
Checking Things Under the Hood
...............5-10
Headlamp Aiming
.....................................5-48
Bulb Replacement
....................................5-51
Windshield Wiper Blade Replacement
.........5-56
Tires
......................................................5-57
Appearance Care
.....................................5-87
Vehicle Identi cation
.................................5-96
Electrical System
......................................5-97
Capacities and Speci cations
...................5-106
Maintenance Schedule..................................... 6-1
Maintenance Schedule
................................ 6-2
Customer Assistance and Information.............. 7-1
Customer Assistance and Information
........... 7-2
Reporting Safety Defects
...........................7-10
Index................................................................ 1
2005 Cadillac DeVille Owner ManualM
Page 19 of 420

Driver Position
Lap-Shoulder Belt
The driver has a lap-shoulder belt. Here is how to wear
it properly.
1. Close and lock the door.
2. Adjust the seat so you can sit up straight. To see
how, see “Seats” in the Index.
3. Pick up the latch plate and pull the belt across you.
Do not let it get twisted.The lap-shoulder belt may lock if you pull the belt
across you very quickly. If this happens, let the belt
go back slightly to unlock it. Then pull the belt
across you more slowly.
4. Push the latch plate into the buckle until it clicks.
Be sure to use the correct buckle when buckling
your lap-shoulder belt. If you nd that the latch plate
will not go fully into the buckle, see if you are
using the buckle for the center passenger position.
Pull up on the latch plate to make sure it is
secure. If the belt is not long enough, seeSafety
Belt Extender on page 1-27.
Make sure the release button on the buckle is
positioned so you would be able to unbuckle the
safety belt quickly if you ever had to.
1-13
Page 20 of 420
The lap part of the belt should be worn low and snug
on the hips, just touching the thighs. In a crash,
this applies force to the strong pelvic bones. And you
would be less likely to slide under the lap belt. If you slid
under it, the belt would apply force at your abdomen.
This could cause serious or even fatal injuries.
The shoulder belt should go over the shoulder and
across the chest. These parts of the body are best able
to take belt restraining forces.
The safety belt locks if there is a sudden stop or crash,
or if you pull the safety belt very quickly out of the
retractor.
1-14
Page 26 of 420
Right Front Passenger Position
To learn how to wear the right front passenger’s safety
belt properly, seeDriver Position on page 1-13.
The right front passenger’s safety belt works the same
way as the driver’s safety belt — except for one
thing. If you ever pull the lap portion of the belt out all
the way, you will engage the child restraint locking
feature. If this happens, just let the belt go back all the
way and start again.
Center Front Passenger Position
Lap Belt
If your vehicle has a front bench seat, someone can sit
in the center position.
When you sit in the center front seating position,
you have a lap safety belt, which has no retractor.
To make the belt longer, tilt the latch plate and pull it
along the belt.
1-20
Page 28 of 420
Lap-Shoulder Belt
All rear seating positions have lap-shoulder belts.
Here is how to wear one properly.
1. Pick up the latch plate and pull the belt across you.
Do not let it get twisted.
The shoulder belt may lock if you pull the belt
across you very quickly. If this happens, let the belt
go back slightly to unlock it. Then pull the belt
across you more slowly.2. Push the latch plate into the buckle until it clicks.
The latch plates for the safety belts in each rear
seating position vary in size. If the center rear or the
left rear latch plate is inserted into the incorrect
buckle, the plate will not latch properly. Be sure you
are using the correct buckle and that the latch
plate clicks when inserted into the buckle.
If the belt stops before it reaches the buckle, tilt the
latch plate and keep pulling until you can buckle it.
1-22
Page 30 of 420

The safety belt locks if there is a sudden stop or a
crash, or if you pull the belt very quickly out of
the retractor.
{CAUTION:
You can be seriously hurt if your shoulder belt
is too loose. In a crash, you would move
forward too much, which could increase injury.
The shoulder belt should t against your body.
To unlatch the belt, just push the button on the buckle.
Rear Safety Belt Comfort Guides for
Children and Small Adults
Rear shoulder belt comfort guides will provide added
safety belt comfort for older children who have outgrown
booster seats and for small adults. When installed on
a shoulder belt, the comfort guide better positions
the belt away from the neck and head.
There is one guide for each outside passenger position
in the rear seat. To provide added safety belt comfort
for children who have outgrown child restraints and
booster seats and for smaller adults, the comfort guides
may be installed on the shoulder belts. Here is how
to install a comfort guide and use the safety belt:
1-24
Page 53 of 420
5. Pull the rest of the lap belt all the way out of the
retractor to set the lock.6. To tighten the belt, feed the lap belt back into the
retractor while you push down on the child restraint.
You may nd it helpful to use your knee to push
down on the child restraint as you tighten the belt.
7. Push and pull the child restraint in different
directions to be sure it is secure.
To remove the child restraint, just unbuckle the vehicle’s
safety belt and let it go back all the way. The safety
belt will move freely again and be ready to work for an
adult or larger child passenger.
1-47
Page 59 of 420
The side impact airbags for the rear seat outboard
passenger positions are in the sides of the rear seatback
closest to the doors.
{CAUTION:
If something is between an occupant and an
airbag, the airbag might not in ate properly
or it might force the object into that person
causing severe injury or even death. The path
of an in ating airbag must be kept clear.
Do not put anything between an occupant and
an airbag, and do not attach or put anything
on the steering wheel hub or on or near any
other airbag covering. Do not let seat covers
block the in ation path of a side impact airbag.
1-53