
To signal a turn, move  the lever all the  way  up  or  down. When the  turn  is 
finished,  the lever  will return  auto~natically. 
A green arrow on the 
instrument panel will 
flash  in the direction 
of the  turn  or lane 
change. 
To signal a lane  change,  just raise  or lower the  lever until the green arrow 
starts  to flash. Hold 
it there until you complete  your  lane change. The  lever 
will return  by itself  when  you  release it. 
As you signal  a turn  or a lane change, if the arrows  flash at twice the normal 
rate, 
a signal bulb  may be burned out and other  drivers may  not  see your 
turn  signal. 
If a bulb is burned out, replace it to help avoid  an accident.  If the green 
arrows  don’t go on at  all  when 
you signal a turn, check for  burned-out bulbs 
and 
a blown  fuse (see “Fuses”  in the Index). 
Headlamp  High-Low  Beam 
To change  the 
headlamps  from low 
beam  to high  or high 
to  low,  pull the 
multifunction  lever all 
the  way  toward 
you. 
Then release it. 
2-40 
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Fuses and Circuit Breakers 
The wiring  circuits in your  vehicle are protected  from short  circuits  by a 
combination  of fuses,  circuit  breakers,  and fusible  thermal  links 
in the 
wiring  itself.  This  greatly  reduces 
the chance of fires  caused by electrical 
problems.  See “Fuses  and Circuit  Breakers’’ 
in the Index  for more 
information. 
Headlamps 
The headlamp  wiring is protected by a  circuit breaker in the lamp  switch. 
An  electrical  overload  will cause 
the lamps to flicker  on and off, or in some 
cases  to  remain 
off. If this  happens,  have  your  headlamp  wiring checked 
right  away. 
Windshield  Wipers 
The  windshield  wiper motor  is protected  by a clrculc DreaKer  ana a ruse. 11 
the motor  overheats due to heavy  snow, etc., the wiper  will stop  until the 
motor  cools.  Although  the  circuit  is protected  from electrical  overload, 
overload  due to heavy  snow,  etc., may  cause  wiper  linkage  damage.  Always 
clear  ice  and heavy  snow  from  the the windshield  before  using  the 
windshield  wipers. If the  overload 
is caused  by some  electrical  problem and 
not snow,  etc., be sure 
to get it fixed. 
Power  Windows and Other  Power  Options 
Circuit  breakers in the  fuse  panel  protect the power windows  and  other 
power  accessories.  When  the current  load is too  heavy, the  circuit breaker 
opens  and  closes.  This  protects  the circuit 
until the current  load returns to 
normal or the  problem  is  fixed. 
Trailer  Wiring  Harness 
The standard  seven-wire  trailer  wiring  harness is protected  by an in-line 
fuse  in the  battery  feed wire.  This  fuse  is near the  junction  block. See 
“Trailer Wiring Harness”  in the  Index  for  more  information. 
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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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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 
6-87 
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Break.In.  New  Vehicle ............................................ 2-9 
Composite  Headlamps ......................................... 6-49 
Bulb  Replacement Center 
High Mounted  Stop  Lamp  (CHMSL) ........................ 6-54 
Fender  Marker  Lamps .......................................... 6-53 
Front  Park/Turn  Signal  Lamps  with  Composite  Headlamps ............ 6-51 
Front  Park/Turn  Signal  Lamps  with  Sealed  Beam  Headlamps ........... 6-50 
HalogenBulbs ................................................ 6-48 
Rear  Lamps  (Chassis  Cab  Models) ................................ 6-56 
Rear  Lamps  (Pickup  Models) .................................... 6-55 
Replacement  Chart ............................................. 6-88 
Roof  Marker  Lamps ........................................... 6-54 
Sealed  Beam  Headlamps ........................................ 6-47 
Side  Marker  Lamps ............................................ 6-52 
Tailgate  Marker  Lamps ......................................... 6-53 
C 
Capacities  and  Specifications ....................................... 6-80 
CarbonMonoxide ............................................... 2-32 
Care of Your  Cassette  Tape  Player  (See  “Audio  Systems” ) 
Cassette  Tape  Player  System  (See  “Audio  Systems” ) 
Catalyticconverter .............................................. 6-57 
Center  High  Mounted  Stop  Lamp (CHMSL) (See  “Lamps” ) 
Certificatioflire  Label ........................................... 4-37 
Changing  a  Flat  Tire .............................................. 5-26 
Chemical  Paint  Spotting ........................................... 6-74 
Cigarette  LightedAshtrays ......................................... 2-58 
Child  Restraints  (See  “Safety  Belts”) 
Circuit  Breakers  (See  “Fuses  and  Circuit  Breakers”) 
Cleaning  DieselEngine 
................................................ 6-14 
Fabric  Protection .............................................. 6-69 
Finishcare .................................................. 6-72 
Glass ....................................................... 6-71 
InsideofVehicle .............................................. 6-68 
Leather ..................................................... 6-70 
Instrument  Panel,  Top .......................................... 6-70 
Outside of Vehicle ............................................. 6-72 
Outside of the  Windshield  and  Wiper  Blades ........................ 6-71 
Special  Problems .............................................. 6-69 
Vinyl ....................................................... 6-70 
Weatherstrips ................................................. 6-71 
Audio  System  with  AUTO  TONE  System ........................... 3-7 
Audio  System  without  AUTO  TONE  System ........................ 3-6 
Underbody .................................................. 6-74 
WheelsandTires .............................................. 6-73 
Clock,  Setting  the 
ComfortControls 
................................................. 3-1 
Compact  Disc  (CD)  System  (See  “Audio  Systems”) 
Compass 
....................................................... 2-54 
Control  of  a  Vehicle ............................................... 4-4 
Coolant  (See  “Engine”) 
Cooling  System  Capacity 
.......................................... 6-82 
Courtesy  Transportation ............................................ 8-7 
CrankcaseCapacity .............................................. 6-83 
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Engine (continued) 
Coolant 
..................................................... 6-35 
Coolant  Heater 
...................................... 2.18.3-4.  6.21 
Coolant  Temperature  Gage  (See “Gages”) 
Control  Module  System 
........................................ 6-57 
Diesel  Heater Output 
............................................ 34 
Exhaust 
..................................................... 2-32 
FanNoise 
................................................... 5-25 
Identification 
....................................... 6-76,677,  6-81 
Oil  (See  “Oil”) 
Overheating 
.................................................. 5-10 
RunningWhileParked 
......................................... 2-32 
Starting  Your Gasoline  Engine 
................................... 2-12 
Starting  Your Diesel  Engine 
..................................... 2-14 
Exhaustsystem 
................................................. 6-56 
F 
Filter  Replacement  Chart  (See “Service-Replacement  Parts and Filter 
Recommendations”) 
FinishDamage 
.................................................. 6-74 
Fluid  Capacities  (See  “Capacities  and Specification”) 
FluidLeakCheck 
................................................ 646 
Fluids  (See  “Scheduled Maintenance  Services”) 
Fog  Lamps  (See “Lamps-Fog”) 
Four-WheelDrive 
.......................................... 2-33,  6-33 
Front Axle Locking  Feature 
..................................... 2-36 
Transfer  Case 
........................................... 2-34,  6-33 
Canadian 
...................................................... 6-5 
Diesel 
....................................................... 6-3 
FillingYourTank 
............................................. 6-11 
Fuel 
Foreign  Countries  (Gasoline  Engines) 
............................. 6-11 
Filter  Replacement  (Diesel  Engines) 
............................... 6-9 
Gage  (See  “Gages”) 
Gasoline 
..................................................... 6-2 
Gasolines  for  Cleaner  Air 
........................................ 6-3 
Running  Out of Fuel  (Diesel  Engines) 
.............................. 6-8 
Tankcapacity 
................................................ 6-83 
Water  in  Fuel  (Diesel  Engines) 
............................... 2-74, 6-5 
Fuses and  Circuit  Breakers ................................... 6-79,  6-87 
FuseBlock 
............................................. 6-80, 6-86 
G 
Gages  Engine  Coolant  Temperature Gage 
................................ 2-80 
Oil  Pressure  Gage 
............................................. 2-81 
Tamper  Resistant  Odometer ..................................... 2-69 
Trip  Odometer 
................................................ 2-69 
FuelGage 
................................................... 2-79 
Speedometer 
................................................. 2-69 
Tachometer 
.................................................. 2-70 
Voltmeter 
.................................................... 2-82 
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