
The 2003 GMC  Sierra Denali Owner  Manual a 
Seats  and  Restraint  Systems ........................... 1-1 
Front  Seats ............................................... 1-2 
Rear  Seats 
............................................... 1-7 
Safety  Belts 
.............................................. 1-8 
Child  Restraints 
....................................... 1-30 
Air  Bag  Systems 
...................................... 1-57 
Restraint  System  Check 
............................ 1-73 
Features  and  Controls 
..................................... 2-1 
Keys 
........................................................ 2-2 
Doors  and  Locks 
....................................... 2-6 
Windows 
................................................. 2-1 0 
Theft-Deterrent  Systems ............................ 2-1 3 
Starting  and Operating Your Vehicle ........... 2-15 
Mirrors 
.................................................... 2-28 
Onstar@  System 
...................................... 2-33 
HomeLink@  Transmitter 
............................. 2-35 
Storage  Areas 
......................................... 2-39 
Instrument  Panel 
............................................. 3-1 
Vehicle 
Personalization 
............................. 2-42 
Instrument  Panel  Overview 
.......................... 3-2 
Climate  Controls 
...................................... 3-1 8 
Warning  Lights,  Gages  and  Indicators 
......... 3-24 
Driver Information Center  (DIC) 
.................. 3-43 
Audio  System(s) 
....................................... 3-61  Driving  Your  Vehicle 
....................................... 4-1 
Your 
Driving, the  Road, and Your  Vehicle ..... 4-2 
Towing 
................................................... 4-45 
Service  and Appearance Care 
.......................... 5-1 
Service 
..................................................... 5-3 
Fuel 
......................................................... 5-5 
Checking  Things  Under  the  Hood 
............................................. 5-10 
All-Wheel  Drive 
........................................ 5-49 
Rear  Axle 
............................................... 5-50 
Front Axle 
............................................... 5-51 
Bulb  Replacement 
.................................... 5-52 
Windshield  Wiper Blade Replacement 
......... 5-60 
Tires 
...................................................... 5-61 
Appearance  Care 
..................................... 5-86 
Vehicle  Identification 
................................. 5-94 
Electrical  System 
...................................... 5-95 
Capacities  and Specifications 
................... 5-1 04 
Normal  Maintenance  Replacement  Parts 
.... 5-1 05 
Maintenance  Schedule 
..................................... 6-1 
Maintenance  Schedule 
................................ 6-2 
Customer Assistance  Information 
.................... 7-1 
Customer  Assistance  Information 
.................. 7-2 
Reporting Safety  Defects 
............................ 7-9 
Index 
................................................................. 1  

Section 2 Features  and  Controls 
Keys ............................................................... 2-2 
Remote  Keyless  Entry  System 
......................... 2-3 
Remote  Keyless  Entry  System  Operation 
........... 2-4 
Doors  and  Locks 
............................................. 2-6 
Door  Locks 
.................................................... 2-6 
Power  Door  Locks 
.......................................... 2-7 
Rear  Doors 
................................................... 2-8 
Tailgate 
........................................................ 2-8 
Windows 
........................................................ 2-10 
Power  Windows 
............................................ 2-11 
Swing-Out  Windows 
...................................... 2-11 
Sun  Visors 
................................................... 2-12 
Theft-Deterrent  Systems 
.................................. 2.13 
Content  Theft-Deterrent 
................................. 2.13 
Passlock@ 
.................................................... 2.14 
Starting  and  Operating  Your  Vehicle 
................ 2.15 
New  Vehicle  Break-In 
.................................... 2.15 
Ignition Positions 
.......................................... 2.15 
Starting  Your  Engine 
..................................... 2.16 
Engine  Coolant  Heater 
.................................. 2.17 
Automatic  Transmission Operation 
................... 2.18 
All-Wheel  Drive 
............................................ 2-21 
Parking  Brake 
.............................................. 2-22 
Shifting Into  Park 
(P) ..................................... 2-23 Shifting 
Out 
of Park  (P) ................................. 2-25 
Parking  Over Things  That  Burn 
....................... 2-26 
Engine  Exhaust 
............................................ 2-26 
Running  Your  Engine  While  You  Are  Parked 
.... 2-27 
Mirrors 
........................................................... 2-28 
Automatic  Dimming  Rearview  Mirror with 
OnStap,  Compass  and  Temperature 
Display 
.................................................... 2-28 
Outside  Power Mirrors 
................................... 2-31 
Outside  Power  Foldaway  Mirrors 
..................... 2-31 
Outside Automatic  Dimming Mirror 
.................. 2-31 
Outside  Curb  View  Assist  Mirrors 
.................... 2-32 
Outside  Convex Mirror 
................................... 2-32 
Outside  Heated Mirrors 
.................................. 2-32 
Onstar@ System 
............................................. 2-33 
HomeLink@  Transmitter 
................................... 2-35 
Programming  the HomeLink  Transmitter 
........... 2-35 
Storage  Areas 
................................................ 2-39 
Glove  Box 
................................................... 2-39 
Cupholder(s) 
................................................ 2-39 
Center  Console  Storage Area 
......................... 2-39 
Tonneau  Cover 
............................................ 2-39 
Vehicle  Personalization 
................................... 2-42 
Memory  Seat 
............................................... 2-42 
2- 1  

HomeLink@ Transmitter 
HomeLink,@ a combined  universal transmitter and 
receiver,  provides  a way  to replace  up to three 
hand-held  transmitters  used to activate devices such as 
gate  operators,  garage  door  openers,  entry  door  locks,  security  systems  and home  lighting. Additional 
HomeLink@  information  can be found  on the  internet  at 
www.homelink.com  or  by calling  1-800-355-351 
5. 
If your  vehicle is equipped  with  the  HomeLink@ 
Transmitter,  it complies  with  Part 
15 of the  FCC  Rules. 
Operation  is  subject  to  the  following two conditions: 
(1)  this  device  may  not  cause  harmful interference, and 
(2) this  device  must  accept  any interference received, 
including  interference  that  may  cause  undesired 
operation.  This device complies 
with  RSS-210  of Industry Canada. 
Operation 
is subject  to the following two  conditions: 
(1) this device  may  not  cause  interference, and (2) this 
device must accept  any interference, including 
interference that  may cause undesired operation  of the 
device. 
Changes  and modifications  to this system by other  than 
an  authorized service facility could  void authorization 
to  use  this equipment. 
Programming  the  HomeLink 
Transmitter 
Do not  use the  HomeLink@  Transmitter with  any garage 
door  opener  that does not have  the “stop and reverse” 
feature.  This includes any  garage  door opener model 
manufactured before  April 
1, 1982. 
Keep  the original transmitter  for  use in other vehicles as 
well  as  for  future HomeLink@  programming.  It is  also 
recommended  that  upon the sale  of the  vehicle, 
the  programmed  HomeLink@ buttons should  be erased 
for  security  purposes.  Refer  to  “Erasing HomeLink@ 
Buttons”  or, for assistance,  contact  HomeLinkO  on  the 
internet  at:  www.homelink.com  or  by calling 
1-800-355-351 
5. 
2-35  

Be sure  that people and objects are clear  of the  garage 
door  or  gate operator  you are programming. When 
programming  a  garage  door,  it is  advised  to park outside 
of  the  garage. 
It is recommended  that a new battery be installed in 
your  hand-held transmitter for  quicker and  more 
accurate transmission  of the  radio  frequency. 
Your  vehicle’s engine should be turned 
off while 
programming the transmitter. Follow these  steps  to 
program up  to three channels: 
1. Press and hold down the two outside  buttons, 
releasing  only  when  the  indicator light begins  to 
flash,  after 
20 seconds. Do not hold down the 
buttons  for  longer  than 30 seconds  and do not 
repeat  this  step  to  program a second  and/or third 
transmitter  to  the remaining two  HomeLink@  buttons. 
2. Position the end of your hand-held transmitter  about 
1 to 3 inches (3 to 8 cm)  away from the HomeLink@ 
buttons  while keeping the  indicator light in  view. 
3.  Simultaneously press and hold both  the desired 
button  on  HomeLink@  and the hand-held transmitter 
button. 
Do not  release the  buttons until Step 4 
has been  completed. 
Some  entry  gates and garage door openers may 
require  you  to substitute Step  3 with the  procedure 
noted in  “Gate Operator and Canadian 
Programming”  later in this section. 
4. The indicator light  will  flash  slowly at first  and  then 
rapidly  after HomeLink@  successfully  receives  the 
frequency signal  from  the hand-held  transmitter. 
Release both  buttons. 
5. Press and hold the  newly-trained  HomeLink@  button 
and observe the  indicator  light. 
If the  indicator light  stays on constantly, 
programming is  complete  and  your  device  should 
activate  when the HomeLink@  button is pressed  and 
released. 
To program the  remaining two HomeLink@  buttons, 
begin  with Step 
2 under  “Programming  HomeLink@.” 
Do not repeat  Step 1 as this will erase all of the 
programmed  channels. 
If the  indicator light blinks  rapidly  for  two  seconds 
and then turns to  a  constant  light,  continue  with 
Steps  6 through 
8 following  to  complete  the 
programming  of a  rolling-code  equipped  device 
(most  commonly,  a  garage  door  opener). 
6. At the  garage  door  opener  receiver  (motor-head 
unit)  in the  garage,  locate  the  “Learn”  or  “Smart” 
button.  This can  usually  be  found  where  the  hanging 
antenna  wire is attached  to  the  motor-head  unit. 
7. Firmly  press and  release  the  “Learn”  or  “Smart” 
button.  The name  and  color  of the  button  may 
vary  by  manufacturer. 
You 
will have  30 seconds  to  start  Step 8. 
2-36  

8. Return  to  the  vehicle. Firmly press and hold the 
programmed  HomeLink@  button for two seconds, 
then  release.  Repeat  the  press/hold/release 
sequence 
a second  time,  and depending  on the 
brand  of the  garage  door  opener  (or  other  rolling 
code  device),  repeat  this sequence  a third time 
to  complete the  programming. 
HomeLink@  should  now  activate your rolling code 
equipped  device. 
To  program  the remaining  two HomeLink@  buttons, 
begin  with  Step 
2 of  “Programming  HomeLink@.” Do not 
repeat  Step 
1. 
Gate  Operator  and Canadian 
Programming 
Canadian radio-frequency laws  require transmitter 
signals to  “time out” 
or quit  after several seconds  of 
transmission. This  may not be long enough for 
HomeLink@  to  pick up the signal during programming. 
Similarly,  some 
U.S. gate operators are manufactured to 
“time  out” in the  same  manner. 
If you  live in  Canada,  or you are having difficulty 
programming a  gate operator  by using the 
“Programming  HomeLinkm’ procedures (regardless  of 
where  you live), replace  Step 
3 under “Programming 
HomeLink@’  with  the following: 
Continue  to  press and hold the  HomeLink@ button while 
you press and release  every  two  seconds (cycle) 
your  hand-held transmitter until the frequency signal  has 
been successfully accepted by  HomeLink@. The 
indicator light will flash  slowly  at first and then  rapidly. 
Proceed  with  Step 
4 under “Programming HomeLink@’ 
to  complete. 
2-37  

Using HomeLink@ 
Press and hold the appropriate  HomeLink@ button for  at 
least  half 
of a  second.  The  indicator light will come 
on  while  the signal 
is being  transmitted. 
Erasing  HomeLink@  Buttons 
To erase  programming from the three buttons  do the 
following: 
1. Press  and hold down the two outside buttons until 
the  indicator light begins to  flash, after 
20 seconds. 
2. Release both buttons. Do not hold for  longer  than 
30 seconds. 
HomeLink@  is now 
in the  train  (learning) mode and can 
be  programmed at any time  beginning with  Step 
2 
under “Programming  HomeLink@.” 
individual buttons can  not be erased, but they can be 
reprogrammed.  See “Reprogramming 
a Single 
HomeLink@  Button” next. 
Reprogramming a Single  HomeLink@ 
Button 
To  program  a device  to  HomeLink@  using  a  HomeLink@ 
button previously  trained,  follow these steps: 
1. Press and hold the desired  HomeLink@  button. Do 
2. The indicator light will begin  to  flash  after 
not  release 
the button. 
20 seconds.  While  still  holding the HomeLink@ 
button,  proceed  with  Step 
2 under  “Programming 
HomeLink@.” 
Resetting  Defaults 
To reset  HomeLink@  to  default  settings  do  the  following: 
1. Hold down  the two  outside  buttons for about 
20 seconds until the  indicator  light  begins  to  flash. 
2. Continue to hold  both  buttons  until the  HomeLink@ 
indicator light  turns 
off. 
3. Release  both  buttons. 
For  questions  or comments,  contact HomeLink@  at 
1-800-355-3515,  or on  the  internet  at 
www.home1ink.com. 
2-38  

Driving Through  Flowing  Water ..................... 4-32 
Driving  with  a  Trailer 
....................................... 4-56 
Dual  Automatic  Climate  Control System 
.......... 3-18 
E 
Easy  Exit  Seat .................... .... 2-43 
Electrical  System 
Add-on  Equipment 
...................................... 5-95 
Fuses  and  Circuit  Breakers 
........................... 5-95 
Power  Windows  and  Other  Power  Options 
...... 5-95 
Windshield  Wiper  Fuses 
............................... 5-95 
Electrochromic  Mirror  Operation 
........................ 2-28 
Maintenance  Programs 
................................. 3-40 
Air  CleanedFilter 
......................................... 5-1 9 
Battery 
....................................................... 5-42 
Check  and  Service Engine  Soon  Light 
............ 3-38 
Coolant 
...................................................... 5-24 
Coolant  Heater 
............................................ 2-17 
Coolant  Temperature  Gage 
........................ 3-36 
Cooling  System Inspection 
......................... 6-14 
Engine  Compartment  Overview 
...................... 5-1  2 
Exhaust 
..................................................... 2-26 
Fan  Noise 
.................................................. 5-36 
Oil 
............................................................. 5-13 
Overheating 
................................................ 5-27 
Starting 
...................................................... 2-1  6 
Emissions 
Inspection and 
Engine  ENGINE  COOLANT  HOT 
................................. 3-54 
Engine  Coolant  Level  Check 
............................. 6-10 
Engine  Hour  Meter  Display 
............................... 3-26 
Engine 
Oil and  Chassis  Lubrication Scheduled 
Engine 
Oil Additives 
........................................ 5-17 
Engine  Oil  Level  Check 
................................... 6-10 
Entry  Lighting 
......................... ............. 3-15 
Maintenance 
................................................. 6-5 
ENGINE  OVERHEATED 
.................................. 3-54 
Erasing  HomeLink@  Buttons 
...... ......... 2-38 
Exit  Lighting 
............................... ............. 3-15 
Express-Down  Windows 
................................... 2-11 
Extender,  Safety  Belt 
....................................... 1-29 
Exterior  Lamps 
............................................... 3-11 
F 
FabridCarpet ................................................. 5-87 
Engine  Air  Cleaner 
...................................... 5-19 
Filter 
Finding 
a  PTY Station 
(RDS,  XMTM and  DAB) 
................................. 3-67 
Finding  a Station 
............................................ 3-64 
Finish  Care 
.................................................... 5-89 
Finish  Damage 
............................................... 5-91 
Fixed  Mast  Antenna 
........................................ 3-84 
Flash-To-Pass Feature 
....................................... 3-6 
Flat Tire 
........................................................ 5-68 
Flat  Tire,  Changing 
......................................... 5-69  

Headlamps  (cont.) Halogen  Bulbs 
............................................ 5-52 
Pickup  Box  Identification  and  Fender 
Marker  Lamps 
......................................... 5-58 
Roof  Marker  Lamps 
..................................... 5-54 
Heated  Seats 
................................................... 1-3 
Highway  Hypnosis 
........................................... 4-36 
Hill  and  Mountain  Roads 
.................................. 4-36 
Hitches 
.......................................................... 4-55 
HomeLink@  Transmitter 
.................................... 2-35 
Hood  Checking  Things  Under 
................................ 5-10 
Release 
..................................................... 5-1 0 
Horn ............................................................... 3-4 
How  to  Add  Coolant 
to the Coolant 
Surge  Tank 
................................................. 5-32 
How 
to Add  Fluid ............................................ 5-23 
How 
to Check ........................................ 5-21,  5-62 
How  to  Check  Lubricant 
................................... 5-50 
How  to  Use  This Manual 
.............. ......... ii 
How to  Wear  Safety Belts  Properly ................... 1-1 3 
HomeLink@  Transmitter,  Programming 
................ 2-35 
How  to  Check  Power  Steering  Fluid 
.................. 5-37 
Hydroplaning 
.................................................. 4-32 
I 
if No Steam Is Coming  From 
Your  Engine 
................................................ 5-29 
If  Steam 
Is Coming  From  Your Engine ............... 5-28 
If the Light  is Flashing ..................................... 3-39 
If  the  Light  is On  Steady 
................................. 3-39 
If  You  Are  Stuck in Sand,  Mud,  Ice or  Snow 
....... 4-42 
If You  Do  Decide To Pull A  Trailer ..................... 4-51 
If You’re  Caught  in  a Blizzard ........................... 4-40 
Ignition Transmission  Lock  Check 
...................... 6-13 
Illuminated  Visor  Vanity  Mirrors 
......................... 2-12 
infants  and  Young  Children,  Restraints 
............... 1-32 
Inflation 
- Tire  Pressure ................................... 5-62 
inspection  Ignition Positions 
............................................. 2-15 
Brake  System 
............................................. 6-15 
Exhaust  System 
.......................................... 6-14 
Fuel  System 
............................................... 6-14 
Engine Cooling  System 
................................ 6-14 
Part 
C - Periodic  Maintenance ....................... 6-14 
Steering and  Suspension 
.............................. 6-14 
Cluster 
....................................................... 3-25 
Overview 
..................................................... 3-2 
Instrument Panel 
7