
Don't  hold  a  cigarette  lighter in with  your  hand  while it is  heating.  If  you 
do, 
it won't  be  able  to  back  away  from  the  heating  element  when it's 
To remove  the  front  ashtray,  pull  on  the  front  of it. 
To remove  the  rear  ashtrays, if you  have  them,  press  down  on  the  inside 
tabs  and  pull. 
Don't  put  papers  and  other  things  that  burn  into  your  ashtrays\
. 
If you  do, 
cigarettes  or  other  smoking  materials  could  set  them  on  fire,  causing  damage. 
Your  vehicle  has a  variety 
of storage  compartments  provided  for  your 
convenience. 
Stoale Compartments 
Glove Box 
To open  your  glove  box,  press the  button  down  and  pull  the  door  open. 
Two  cup  holders  are  provided  for  your  convenience. 
2-63 
ProCarManuals.com 

,. *. 
’ 
Service & Appearance Care 
Truck-Camper  Loading  Information 
Open  your  glove  box  door  and look for  this  label: 
PO338 
This  label  will  tell  you  how  much of a  load  your  vehicle  can  carry,  and  how 
to  spread  out  your  load  the  right  way. 
Also, it  will  help  you  match  the  right 
slide-in  camper  to  your  vehicle. 
When  you  carry  a  slide-in  camper,  the  total  cargo  load 
of your  vehicle  is  the 
weight  of  the  camper, 
plus 
everything  else  added  to  the  camper  after it left  the  factory; 
everything  in  the  camper;  and 
all  the  people  inside. 
I ne  Cargo  Weight  Rating  (CWR)  is  the  maximum  weight  of  the  l\
oad  your 
vehicle  can  carry.  It doesn’t  include  the  weight  of  the  people  inside.  But,  you 
can  figure  about 
150 pounds for each  seat. 
ProCarManuals.com 

The total  carqo  load  must  not  be  more  than  your  vehicle’s  CWR. 
TRUCK  LOADING  INFORMATION 
--7 c ‘nl 
1. Recommended  location  for cargo 
center  of gravity  for cargo  weight 
rating  (Pickup  Truck). 
Note:  Use  rear  edge 
of load  floor 
for  measurement  purposes. 
EXAMPLE OF PROPER  TRUCK 
AND  CAMPER  MATCH 
I 
PO484 
The  camper’s  center  of gravity  should  fall within  the  center  of gravity  zone  for 
your  vehicle’s  cargo  load. 
1. Camper  center  of gravity, 
2. Recommended  center  of gravity 
* Refer  to  Truck Camper  Loading 
location  zone. 
Information  label  in  glove 
box for 
“A” and “8” dimensions. 
You  must  weigh  any  accessories or other  equipment  you  add  to your  vehicle. 
Then,  subtract  this  extra  weight  from  the  CWR.  This  extra  weig\
ht  may  shorten 
the  center  of gravity  zone  for  your  vehicle.  Your dealer  can  help  you  with 
this. 
If  your  slide-in  camper  and  its load  weigh  less  then  the  CWR,  the  center  of 
gravity  zone  for  your  vehicle  may  be  larger. 
Your  dealer  can  help  you  make  a  good  vehicle-camper  match.  He’ll \
 also  help 
you  determine  your  CWR. 
After  you’ve  loaded your  vehicle  and  camper,  drive  to a  weigh  station  and 
weigh  on  the  front  and  rear  wheels  separately.  This  will  tell you  the  loads  on 
your  axles.  The  loads  on  the  front  and  rear  axles  shouldn’t\
  be  more  than 
either  of the  GAWRs.  The  total of the  axle  loads  should  not  be  more  than 
the  GVWR. 
Open  your  driver’s  door  and  look  at  the  Certificationnire label 
to find out  your 
GWAR and  GVWR. 
If  you’ve  gone  over  your  weight  ratings,  move  or  take  out  some\
  things  until 
all  the  weights  fall below  the  ratings.  Of  course,  you  should  always  tie down 
any  loose  items  when  you  load your  vehicle  or  camper. 
When  you  install  and  load your  slide-in  camper,  check  the  manufacturer’s 
instructions. 
6-7 1 
ProCarManuals.com 

Service & Appearance Care 
Service  Parts  Identification Label 
VEHICLE < 
NUMBER IOENTlFlCATlOP 
WMEELBASE 
I 
Service Par+s Identification 00 NOT REMOVE 
PRlhlfD IN 0 5 A 
I PAINT  TECHNOLOGY 
EXTERIORCOLORS ORDER 
NUMBER 
)- MODEL DESIGNATION 
OPTION  CONTENT 
t 
K2680 
You’ll  find  this  label  on  the  inside  of the  glove  box. It’s very  helpful if you 
ever  need 
to order  parts.  On  this  label  is: 
Your VIN. 
Its model  designation. 
Paint  information. 
A list  of all  production  options and special  equipment. 
Be  sure  that  this  label  is  not  removed  from  the  vehicle. 
Add-on  Electrical  Equipment 
I NOTICE 
I lon’t add  anything  electrical to your  vehicle  unless  you  check with your 
iealer  first.  Some  electrical  equipment  can  damage  your  vehicle  and  th\
e 
iamage  wouldn’t  be  covered  by  your  warranty. 
So just  keep 
3tther things  from  working as they should. 
6-94 
ProCarManuals.com 

Service & Appearance Care 
Fuses and Circuit  Breakers 
Name 
Gages 
Turn-B/U  EMCllgn 
Inj.  A 
Brake 
AC/Htr 
Ctsy 
Park  LP  P.  Lps 
StoplHaz.  Wiper 
Radio 
Accll  g  n 
. 
Acc/Batt.  Crank 4WD 
DRL 
Circuits  Protected 
Cruise  Control,  4  WD  Display  Illum.  Rear 
Window  Defogger  Timer,  Aux.  Batt.  Relay 
Feed,  Safety  Belt  Buzzer  Timer,  Cluster 
Ign.  Feed 
Back-up  Lamps,  Turn  Signals 
T.C.C.,  Air  Diverter,  E.S.C.,  E.G.R.,  E.C.M. 
Ign.,  R.W.A.L.  Brake  Switch 
Throttle  Body  Injectors  R.W.A.L.,  Cluster-Speed0 
H.V.A.C. 
4 WD,  Aux.  Batt.  Relay 
Dome  Lamp,  Cargo  Lamp,  Ctsy.  and  Glove 
Box  Lps.  (TR-9),  Radio  (Memory-Clock) 
Horn  Relay,  Horn  Feed,  Cigar  Lighter,  Park 
Lamps 
C49  SW  Illum.,  Headlamp  “On”  Warning, 
Radio  Illum.,  H.V.A.C.  Illum. 
Haz.  Flasher,  Seat  Belt  Buzzer,  Stop 
Lmps.,  R.W.A.L.  Memory 
Windshield  Wiper,  Washer 
Radio  Feed 
Pwr.  Windows 
Door  Locks,  Rear  Window  Defogger 
Crank,  Discreet  Four  Wheel  Drive 
Daytime  Running  Lights 
Fuse 
20  Amp 
15 Amp 
10 Amp 
10 Amp 
15 Amp 
25  Amp 
20  Amp 
20 Amp 
5 Amp 
15 Amp 
25  Amp 
10 Amp 
5  Amp 
25  Amp 
15 AmD 
Circuit 
Breaker 
30 Amp 
30 Amp 
An  inline  fuse 
is used  for  the  underhood  lamp 
10 not use  fuses  of  higher amperage  than  those  recommended  above. 
TO038 
6-1 00 
ProCarManuals.com 

On  manual  transmission  vehicles,  put  the  shift  lever in N (Neutral),  push  the 
clutch  down halfway,  and  try  to start  the  engine.  The  starter  should  work  only 
when  the  clutch  is  pushed  down  all the  way  to the  floor. 
Steering  column  lock  operation -While  parked,  try  to turn  the  key  to Lock 
in  each  gear  shift  position. 
With  an  automatic  transmission,  the  key  should  turn  to 
Lock only  when  the 
gear  shift is in 
P (Park). 
On  vehicles  with  a  key  release  lever,  try  to turn  the  key  to 
Lock without 
pressing  the  lever.  The  key  should  turn to 
Lock only  with  the  key  lever 
depressed. 
On  all  vehicles,  the  key  should  come  out  only  in 
Lock. 
Parking  brake and  transmission 
P (PARK) mechanism  operation - 
CAUTION I 
4 When  you  are  doing  this  check,  your  vehicle  could begin to move. 
You 
or others  could be injured  and property could  be  damaged. 
Make  sure  there  is 
room in front of your vehicle in case  you  begin 
to 
roll. Be  ready  to apply  the regular  brake  at  once should  the 
vehicle  begin to move. 
IW 
Park  on  a  fairly  steep  hill,  with  the  vehicle  facing  downhill.\
  Keeping  your  foot 
on  the  regular  brake,  set  the  manual  parking  brake. 
To check  the  parking  brake:  With  the  engine  running  and  the 
transmission  in 
N (Neutral),  slowly  remove  foot  pressure from the  regular 
brake  pedal. 
Do this  until  the  vehicle  is  held  by the  parking  brake  only. 
To check  the  “Park”  mechanism’s  holding  ability:  Apply  the \
 regular  brake 
and  shift  to 
P (Park).  Release  the  manual  parking  brake,  then  slowly 
release  the  regular  brake. 
Lap  and  shoulder  belts  condition  and  operation -Inspect  belt  system, 
including:  webbing,  buckles,  latch  plates,  retractors,  guide  loop\
s  and  anchors. 
Have  a  belt  assembly  replaced 
if the  webbing  has  been  cut or otherwise 
damaged. 
Body 
Lubrication  Service -Lubricate  all body  door  hinges  with  engine  oil. 
Also lubricate  the  tailgate,  tailgate  handle  pivot  points,  and  tailga\
te  mounted 
spare  tire carrier 
(if equipped).  Lubricate  the  body  hood,  fuel door  and  rear 
compartment  hinges,  latches  and  locks  including  interior  glove 
box and 
console 
doors, and  any  folding seat  hardware.  Lubricate  the  hood  safety  lever 
pivot  and  prop 
rod pivot.  More  frequent  lubrication may be  required  when 
exposed  to a  corrosive  environment. 
7-23 
ProCarManuals.com 

1993 SERVICE  PUBLICATIONS 
ORDERING  INFORMATION 
You  can  get  manuals  that  tell  how  to  operate  and  service  your  veh\
icle. 
To order  them, fill out  the  order  form  on  the  next  page  and  send it to 
the  address  below. 
GMC  Truck  Service  Publications 
Post  Office  Box  436006 Pontiac,  MI  48343 
If you  have  questions  or  would  like  to  order  using  your  credit  c\
ard, call 
us  TOLL  FREE  at 
1-800-627-5699. 
From  outside  the  Continental  United  States,  please  call  1-313-45\
5-8016 
GLOVE BOX LITERATURE  FOR  YOUR  SIERRA 
Manual  Form  Number  Price 
Owner’s  Manual  X-9304 $5.50 
Warranty  Manual  X-931  7 $2.00 
Vehicle  Storage  Manual  x-01 
01 - 
You can  also  order  the  Glove  Box  Literature  in a  vinyl  pottfolio  which 
includes  all of  these  publications. 
Ask for  form  number  15690052-it 
costs 
$1 4.00. 
SERVICE  MANUALS  FOR  ALL  LIGHT  DUTY  TRUCKS 
*Includes  Fuel  and  Emissions  Manual  X-9336 
Model  Form  Number  Price* 
1993 C/K Models  X-9331  $62.00 
1993 
G Van  x-9357 $70.00 
1993  P3 
81 PIG  Models  X-9332  $64.00 
1993  Safari  X-9330  $62.00 
1993 
S/T Models  X-9329 $6 1 .OO 
There  are  other  service  manuals  you  can  buy  that  cover  the  el\
ectrical 
systems  and  unit  repair.  Call  us  to  get  a  catalogue  listing  o\
f  all these 
manuals. 
PRODUCT  SERVICE  PUBLICATIONS 
Description  Form  Number  Price 
* 1990  Model  Year Index  PSP I 90  Free 
1991  Model Year  Index  PSP I 91  Free 
1992  Model Year Index  PSP I 92  Free 
1993  Model Year  Index  PSP I 93  Free 
1993  Model Year  Product  Service 
Publication  Subscription 
PSP 93 $75.00 
Above  Subscription  With  Binder  PSP  93B $85.00 
Binder  Only PSP  B $1 5.00 
Prices  subject  to  change  without  notice. 
ProCarManuals.com 

S 
Safety  Belts .................................. 1-1 1 
Center  Passenger  Position 
...... 1-26 
Cleaning 
..................................... 6-87 
Checking  Restraint  System 
..... 1-52 
Child  Restraints 
........................ 1-37 
Children 
..................................... 1-35 
Driver  Position 
.......................... 1-1 8 
Extender 
.................................... 1-52 
Lap  Shoulder 
............................. 1-19 
Larger  Children 
.......... : .............. 1-50 
Proper  Wear 
.............................. 1-1 8 
Questions  and  Answers 
.......... 1-1  6 
Rear  Seat  Passengers 
............. 1-29 
Reminder  Light 
......................... 1-1  7 
Replacing  After  a  Crash 
.......... 1-53 
Right  Front  Passenger  Position 
.................................. 1-25 
Small  Children  and  Babies 
..... 1-36 
Use  During  Pregnancy 
............. 1-24 
Why  They  Work 
........................ 1-13 
Safety  Chains 
............................... 4-58 
Safety  Warnings  and Symbols 
..... 0-2 
Scheduled  Maintenance  Services 
................ 7-3,  7-4,  7-18 
Seats 
Controls 
........................................ 1-2 
Easy  Entry  Seat 
.......................... 1-8 
Latches 
.............................. 1-5,  1-10 
Manual  Front 
............................... 1-2 
Power  Driver’s 
............................ 1-3 
Rear 
.............................................. 1-9 
Reclining 
..................................... 1-3 
Do-It-Yourself 
............................... 6-3 
Parts  Identification  Label 
......... 6-94 
Publications 
........................ 8-6,  8-8 
Replacement 
. Parts  and 
Filter  Recommendations 
...... 6-99 
Light 
................................ 2-83,  6-66 
Adults 
........................................ 1-1 
8 
Service 
Service  Engine  Soon  Service  Station  Checks 
............... 7-28 
Shift  Indicator  Light 
.......... 2.27. 2-85 
Shifting  Into  Park 
........................ 2-30 
Single  Belt  Accessory  Drive 
...... 6-51 
Sliding  Rear  Window 
.................. 2-40 
Spare  Tire 
..................................... 5-20 
Pickup  Bed  Mourrting 
.... 5.23.  5-32 
Removal 
..................................... 5-21 
Storage 
...................................... 5-31 
Specification  Charts 
.................... 6-95 
Speedometer 
................................ 2-76 
Starting  Your Diesel  Engine 
....... 2-15 
Starting  Your Gasoline  Engine 
... 2-12 
Steering 
......................................... 4-19 
Column  Shift Lever 
.................. 2-31 
In  Emergencies 
........................ 4-21 
Storage  Compartments 
............... 2-63 
Console 
........................... 2.64.  2-65 
Glove  Box 
................................. 2-63 
Other 
.......................................... 2-68 
Sun  Visors 
.................................... 2-61 
Swing-Out  Windows 
.................... 2-40 
T 
Tachometer ........................ 2-76,  2-78 
Tailgate 
............................................ 2-8 
Theft 
................................................ 2-9 
Thermostat 
.................................... 6-46 
Tilt  Wheel 
..................................... 2-41 
Tires 
............................................... 6-72 
Balancing 
................................... 6-82 
Chains 
........................................ 6-84 
Changing  a  Flat 
............. 5-17,  5-23 
Flat 
............................................. 5-17 
Hub  CapsNVheel  Nut  Caps 
.... 5-24 
Inspection/Rotation 
........ 6-78.  6-79 
Loading 
...................................... 6-67 
New 
................................. 6-80.  6-81 
Pressure 
..................................... 6-73 
Spare  (See  “Spare  Tire”)  Underbody  Carrier 
................... 5-21 
Uniform  Tire  Quality  Grading 
. 6-81 
9-6 
ProCarManuals.com