
5. Press MIN and “000” will appear  on the display. 
6. Press the MIN  button again to make  the last  two  digits  agree with your 
code. 
7. Press  HR to make the  first  one  or  two  digits  agree  with your  code. 
8. Press  AM/FM  after you have confirmed  that the  code matches the  one 
you  wrote  down.  rEP  appears 
in the display,  indicating  that you need to 
repeat  steps 
5 through 7. 
9. Press AM/FM  and this time the display will show SEC. 
With the ignition  off, the  THEFTLOCK indicator will flash. 
To Unlock THEFTLOCK  After a Power Loss 
When battery  power is reapplied to a secured radio,  the  radio won’t  turn  on 
and 
“LOC” will appear  on the display. 
Enter  your secret  code  as follows.  Pause  no more  than 
15 seconds  between 
steps. 
1. Turn  the ignition  on. 
2. Turn the  radio  off. 
3. Press MIN and “000” will appear on the display. 
4. Press the  MIN button again to make  the last  two  digits  agree with your 
code. 
5. Press  HR to make the  first  one or  two  digits  agree  with your  code. 
6. Press  AM/FM  after  you have confirmed  that the  code matches the  one 
you  wrote  down. 
SEC appears  in the display indicating that the radio is 
now  operable. 
To Disable  THEFTLOCK 
1. 
2. 
3. 
4. 
5. 
6. 
Turn the ignition  on. 
Turn the  radio off. 
With  the time  showing 
in the display, press the 1 and 4 buttons 
together. Hold them down until 
“SEC” shows on the display. 
You  are now  ready 
to enter  your secret code.  Don’t wait more  than 15 
seconds between  any of the following  steps. 
Press MIN  and 
“000” will appear  on the display. 
Press the MIN button  again 
to make the  last  two  digits  agree  with your 
code. 
Press 
HR to make the first  one  or  two digits agree with your code. 
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ProCarManuals.com 

7. Press AM/FM  after you have confirmed  that  the code matches  the one 
you wrote  down. - 
system is unsecured  (disabled). 
id ’‘ will appear in  the display, indicating that the 
If  the code is incorrect, 
“SEC” will appear in the display and the system  will 
still  be secured. The radio  will still operate 
if it is secured  or unsecured. If 
“SEC”  appears  and  you  still want  to disable  the system, follow  the disable 
procedure  again  and enter  the correct  code. 
Remote  Cassette  Player - ETRR AM-FM  Stereo Audio 
Compact  Disc  ATC  System 
System that includes a 
remote cassette  player, 
the  cassette player 
is 
located in the  center 
of  the instrument 
panel. 
Your  tape player  is built to  work  best  with tapes that are 
30 to 45 minutes 
long  on each  side.  Tapes longer  than that are 
so thin  they  may  not work well 
in  this  player. 
To load a cassette  tape with the ignition  off, first press  EJECT. Then, insert 
the  cassette  tape. 
Once  the tape  is playing, 
use the control  knobs for volume, balance,  fade, 
treble  and bass  just as 
you do  for  the radio. A lighted tape  symbol  shows 
when  a  cassette  tape 
is in the player. A lighted arrow  will also  appear  and 
show  the direction  of play  when  a tape  is active. 
The  player  automatically  senses if the  cassette  tape 
is metal or CRO;! and 
adjusts  for best playback  sound.  For metal tapes, 
00 (Dolby@  Noise 
Reduction)  will appear 
in the display. 
Any  time  a  cassette  tape 
is inserted, the top side is selected  for play  first. 
PREV 
(1) - Press PREV  or 4 SEEK (in the opposite direction that the 
lighted tape  direction arrow points)  to search  for the  previous  selection. 
A 
minimum  three-second  blank  gap is needed for the player to  stop at the 
beginning  of the selection.  The tape direction arrow  will blink during 
the 
SEEK operation and  the audio  is in the mute mode. 
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PROG (on cassette  player) - Press PROG to  go from  one  side  of the tape 
to  the  other. 
NEXT 
(3) - Press  NEXT  or  SEEK (in the direction that the lighted tape 
direction  arrow points)  to search  for the next  selection.  A  minimum 
three-second  blank gap is needed  for  the player to  stop  at  the beginning  of 
the  selection.  NEXT  will appear 
in the display  and  the audio  is in the mute 
mode. 
REV 
(4) - To  rapidly  reverse the  tape, press REV and the tape will rapidly 
reverse to the beginning  of 
the cassette reel or until you press  REV  again. 
The  radio plays the last selected station  during REV. 
00 (5) - 00 is active  at  all times  with a tape  inserted in the remote 
cassette. 
00 will  appear in the display. 
FWD (6) - To rapidly  advance  the tape, press  FWD and the tape will 
rapidly  advance  to the end of the  cassette  reel or until you press FWD again. 
The  radio  plays  the last  selected station during 
FWD. 
TAPE - To switch between the player and the  radio when a tape is playing, 
press the AM/FM button. 
To return  to the tape player, press  CD AUX.  The 
lighted arrow 
will appear  next to  the tape  symbol  and show the direction of 
play when a tape is  active. 
EJECT  (on cassette  player) 
- To remove  the tape press the  EJECT button. 
EJECT  can be used  with either  the ignition  or radio  off. Also,  you must 
press  EJECT  before loading 
a cassette  with the radio  off to allow loading. 
If  a tape  is inserted with  side 
“1” (or “A”) up, then  the right arrow means 
that that  side  is being played.  Likewise, 
a left arrow would indicate that  side 
b‘2“ (or “B”) had been  selected. 
00 Dolby”  Noise  Reduction  is manufactured  under a lice-nse  from Dolby 
Laboratories  Licensing  Corporation.  DolbyB  and the 
00 symbol are 
trademarks  of Dolby  Laboratories  Licensing  Corporation. 
Understanding  Radio  Reception 
FM stereo will give  you  the  best sound. But FM signals will reach only 
about 
10 to 40 miles (I 6 to 65 km). And, tall buildings  or hills can interfere 
with  FM signals,  causing  the sound to  come and go. 
The  range  for most  AM stations  is greater than  for  FM, especially  at night. 
The longer range, however,  can cause  stations to interfere  with each  other. 
AM can pick up noise from things like  stornx and power  lines.  Try reducing 
the  treble 
to reduce  this noise if you  ever  get  it. 
AM  Stereo  means the  Delco‘ system can  receive C-QUAM“stereo 
broadcasts.  Many  AM stations around the  county use  C-QUAM“  to 
produce  stereo, though  some 
do not. (C-QUAM& is a registered  trademark 
of  Motorola,  Inc.) 
If your  Delco@  system can get C-QUAMa,  your 
“STEREO” light will come on when you’re  receiving  it. 
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ProCarManuals.com 

Be  aware that hearing  damage from loud noise is almost undetectable until 
it  is 
too late.  Your  hearing can adapt to higher volumes  of sound.  Sound that 
seems  normal can  be  loud  and  harmful  to your hearing.  Take precautions  by 
adjusting  the volume control on your radio to  a safe sound level before your 
hearing  adapts 
to it. 
To  help avoid hearing loss or damage: 
1. Adjust the volume control  to  the lowest setting. 
2. Increase volume slowly until  you hear comfortably  and clearly. 
NOTICE: 
Before  you add  any  sound  equipment  to  your  vehicle - like a 
tape player, CB radio,  mobile  telephone  or  two-way radio - be 
sure  you can  add  what  you want. 
If you can,  it’s very  important 
to  do  it  properly.  Added  sound  equipment  may  interfere  with  th\
e  operation 
of your  vehicle’s  engine,  Delcoa  radio  or  other 
systems,  and  even  damage  them.  And,  your  vehicle’s systems 
may  interfere  with  the  operation  of sound  equipment  that  has 
been  added  improperly. 
So, before  adding  sound  equipment,  check  with  your  dealer  and 
be  sure  to  check  Federal  rules  covering  mobile  radio  and 
telephone  units. 
Care of Your Cassette  Player  and  Tapes 
A tape player that is  not cleaned regularly  is subject to reduced sound 
quality, ruining the cassette,  or damaging the mechanism.  Tape cassettes  that 
are  not properly  stored 
in their plastic cases away  from  contaminants,  direct 
sunlight,  and extreme heat  may  not operate properly  and could  cause 
premature  failure of the tape player. 
Your  tape player  should be cleaned  with every 
50 hours  of  use  to provide 
optimum performance.  Your radio  may display  “Cln” (Clean) 
to indicate 
that  you have  used your tape player  for 
50 hours without  re-setting the tape 
clean timer.  If 
you notice a reduction  in sound quality, regardless  of when 
the tape  player  was last cleaned,  try playing  a different  cassette  to  see  if the 
tape  or  tape  player is  at  fault.  If the second cassette results  in 
no 
improvement in sound quality,  try cleaning the tape player. 
Proper tape player cleaning  should  be done  with a  scrubbing  action, 
non-abrasive  cleaning cassette.  This 
is a wet-type  cleaning system that uses 
a cleaning cassette with pads  which  scrub the tape head as the hubs of the 
cleaner cassette turn. 
To properly clean your tape player, follow instructions 
with 
the cleaning  cassette. If  you use this type  of cleaner, the radio  may 
3-24 
ProCarManuals.com 

display an error  and eject  the cartridge.  This  is  normal  and is the  result  of  an 
added  feature 
in the tape  player  that  detects broken tapes. If an  e.rror  occurs, 
you 
will need  to insert the  cleaning  cassette  at least 3 times to thoroughly 
clean  the tape player. 
You  may  prefer  to  use 
a non-scrubbing  action, wet-type  cleaner. This type 
of  cleaner  uses 
a fabric belt to clean the tape head.  This type of cleaner 
cassette  will 
not cause an error, but it may not clean the tape player as 
thoroughly as the scrubbing  type cleaner. 
A scrubbing  action cleaner  cassette  is available  through your retailer (SPO 
# 12344600). 
Cassettes  are  subject to wear and the  sound quality  may degrade  over time. 
Always  verify that the  cassette tape is 
in good condition  and the tape player 
is  clean before  obtaining  service  on  your tape player. 
NOTICE: 
Cassette  tape  adapter  kits  for  portable CD players  will  not  work 
in  your  cassette  player.  These  adapters 
will cause  the  radio  to 
display  an  error  and  the  adapter  cassette 
will be  ejected. 
Care of Compact Discs 
Handle  discs  carefully. Store them in their original cases  or other  protective 
cases  and away  from  direct  sunlight and dust.  If the  surface 
of a disc is 
soiled, dampen 
a clean,  soft  cloth in a mild, neutral detergent  solution and 
clean 
it, wiping  from the center to the  edge. 
Be  sure  never  to touch the signal  surface when handling  discs. Pick up discs 
by  grasping  the outer  edges  or  the edge  of the hole and the  outer  edge. 
Fixed Mast  Antenna 
The fixed  mast  antenna  can  withstand  most  car washes without be.ing 
damaged. 
If the mast  should  ever  become slightly bent, you can straighten it 
out by hand.  If the mast is badly bent,  as it might  be  by vandals, you should 
rep1  ace  it. 
Check  every  once 
in a while  to be  sure the mast  is  still tightened to the 
fender. 
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You could  be injured if the vehicles roll.  Set the parking brake firmly 
on each  vehicle.  Put an automatic transmission in PARK (P) or a 
manual  transmission in NEUTRAL (N). If you have a 
four-wheel-drive  vehicle, be sure  the transfer  case is  not in NEUTRAL 
(N). 
3. Turn  off  the  ignition on both vehicles. Turn  off all lights that  aren’t 
needed, and radios.  This 
will avoid sparks and help save both batteries. 
And  it could  save your radio! 
NOTICE: 
If you  leave  your radio  on, it could  be  badly  damaged. The 
repairs  wouldn’t  be  covered  by your warranty. 
4. Open  the hoods and locate the batteries.  Find the positive (+) and 
negative 
(-) terminals on each battery. 
A CAUTION: 
Using  a match  near a battery  can cause battery gas  to  explode. 
People  have been hurt doing  this, and some  have  been  blinded. 
Use 
a flashlight if you  need  more light. 
Be  sure  the batteries  have enough 
water. You don’t  need  to  add 
water to  the Delco Freedom@  battery (or batteries)  installed in 
every  new 
GM vehicle.  But if a battery  has filler  caps,  be sure 
the  right  amount of fluid  is  there. 
If it is low,  add water to take 
care 
of that  first. If you don’t,  explosive  gas could  be  present. 
Battery  fluid contains acid  that can burn  you.  Don’t  get 
it on 
you. 
ff you  accidentally  get it in your  eyes or on your  skin,  flush 
the place  with water  and get  medical  help immediately. 
5. Check  that the jumper  cables don’t have  loose or missing insulation.  If 
they  do, 
you could get  a shock.  The vehicles  could be damaged, too. 
Before you  connect the cables,  here are  some basic things  you should 
know. Positive 
(+) will go to  positive (+) and negative (-) will  go  to 
negative 
(-) or a metal  engine  part. Don’t  connect (+) to (-) or you’ll 
get 
a short that would  damage the battery and maybe  other parts, too. 
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ProCarManuals.com 

Fuse Block 
The fuse block access 
door  is on the  driver’s 
side  edge 
of the 
instrument panel. 
Pull 
off  the  cover  to access 
the fuse block. 
You can  remove  fuses 
with  a fuse extractor. 
The  fuse  extractor  is 
mounted to the  fuse 
block access door. 
To remove  fuses  if  you don’t have  a  fuse extractor, hold the end  of the  fuse 
between  your thumb and index  finger and pull straight out. 
Be  sure  to  use  the correct fuse. If  you  ever have  a problem 
on the  road  and 
don’t have  a  spare  fuse,  you can “borrow”  one 
of the correct  value. Just pick 
some  feature  of your  vehicle that 
you can get along  without-like  the  radio 
or  cigarette  lighter-and  use  its fuse,  if 
it is of the value you need. Replace 
it  as  soon  as  you can.  See “Fuses and Circuit Breakers”  in  the Tndex  for 
more  information. 
Specification Charts 
Replacement  Parts 
Replacement  part numbers listed in this section are based on the latest 
information  available at the  time 
of printing,  and  are subject to  change. If a 
part listed in this manual  is not the same  as the part used in your vehicle 
when  it was built, 
or if  you  have any questions,  please contact your GM 
truck dealer. 
These  specifications  are  for  information 
only. If you have any questions,  see 
the  service  manual  for the  chassis  or refer 
to the body manufacturer’s 
publications. 
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ProCarManuals.com 

Fuses and Circuit  Breakers 
POSITION NAME 
1. STOP/HAZ 
2. 
3. 
4. 
5. 
6. 
7. 
8. 
9. 
10. 
11. 
12. 
13. 
14. 
IS. 
16. 
17. 
18. 
19. 
20. 
21.  22. 
T CASE 
CTSY 
GAGES 
RR  HVAC 
CRUISE 
AUX PWR 
CRANK 
PARK  LPS 
AIR  BAG 
WIPER  HTR-A/C 
CIG  LTR 
ILLUM 
DRL-FOG 
TURN-B/U  RADIO 
BRAKE  RADIO 
BATT 
TRANS 
CIRCUITS  PROTECTED 
Stop/TCC  Switch,  Buzzer, CHMSL,  Hazard 
Lamps,  Stop  Lamps 
Transfer  Case 
Courtesy  Lamps,  Cargo  Lamp,  Glove  Box 
Light,  Dome/RDG  Lamps, Vanity Mirrors, 
Pwr Mirrors 
IP  Cluster,  DRL  Relay, HDLP  Switch, 
Keyless Entry, Low Coolant  Module 
RR  HVAC  Controls 
Cruise  Control 
Aux Power Outlet 
Diesel Fuel  Pump,  DERM,  ECM 
Lic Lamp, Park  Lamp, Tail Lamp,  Roof 
Marker  Lamp,  Tail Gate  Lamps,  Front Side 
Markers,  Fog Lamp  Relay, Door Switch 
Illum, Fender  Lamps 
DERM 
Wiper Motor, Washer  Pump 
A/C,  A/C Blower, High Blower Relay 
Power  Amp,  Cig  Lighter, Door Lock Relay, 
Pwr  Lumbar  Seat 
4WD,  Indicator,  LP Cluster,  HVAC 
Controls, 
RR HVAC  Controls,  IP  Switches, 
Radio  Illumination 
DRL  Relay, Fog  Lamp Relay 
Frt Turn, RR Turn, B/U Lps 
Radio  (Ign) 
DRAC,  4WAL PCM, ABS, Cruise 
Radio  (Batt) 
PRNDL,  Auto Transmission,  Speedo, 
Check  Gages 
Tell Tale 
Not Used 
Not Used 
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