1999 CHEVROLET C/K headlamp

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6-43
3. Pull the socket out of
the lamp assembly.
4. Push in gently on the bulb, turn it counterclockwise
and remove it from the socket.
5. Put the new bulb into the socket, gently press in on
the bulb and turn it clockwise until it is tight.
6. Put the socket back into the lamp assembly and turn
it clockwise until it locks.
7. Put the parking/turn signal lamp assembly back into
the vehicle and tighten the four screws.Front Sidemarker Lamps
(Composite Headlamps)
1. Remove the four screws
and pull out the
parking/turn signal
lamp assembly.
2. Reach through the opening and turn the sidemarker
bulb socket counterclockwise and remove it.

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6-59
NOTICE:
The wrong wheel can also cause problems with
bearing life, brake cooling, speedometer or
odometer calibration, headlamp aim, bumper
height, vehicle ground clearance and tire or tire
chain clearance to the body and chassis.
Whenever a wheel, wheel bolt or wheel nut is replaced
on a dual wheel setup, check the wheel nut torque after
100, 1,000 and 6,000 miles (160, 1 600 and 10 000 km)
of driving. For proper torque, see ªWheel Nut Torqueº
in the Index.
See ªChanging a Flat Tireº in the Index for
more information.Used Replacement Wheels
CAUTION:
Putting a used wheel on your vehicle is
dangerous. You can't know how it's been used or
how far it's been driven. It could fail suddenly
and cause an accident. If you have to replace a
wheel, use a new GM original equipment wheel.

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6-70 Headlamps
The headlamp wiring is protected by an internal circuit
breaker. An electrical overload will cause the lamps
to go 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 circuit
breaker and a fuse. If the motor overheats due to heavy
snow, etc., the wiper will stop until the motor cools. 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 protect the power windows and other
power accessories. When the current load is too heavy,
the circuit breaker opens and closes, protecting the
circuit until the problem is fixed or goes away.
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. This greatly reduces the
chance of fires caused by electrical problems.
Look at the silver
-colored band inside the fuse. If the
band is broken or melted, replace the fuse. Be sure you
replace a bad fuse with a new one of the identical size
and rating.
If you ever have a problem on the road and don't have
a spare fuse, you can borrow one that has the same
amperage. 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 the correct amperage.
Replace it as soon as you can.

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6-72
Fuse/Circuit
Breaker Usage
3 Courtesy Lamps, Cargo Lamp,
Glove Box Lamp, Dome/Reading
Lamps, Vanity Mirrors,
Power Mirrors
4 Instrument Cluster, DRL Relay,
Lamp Switch, Keyless Entry,
Low Coolant Module, Illuminated
Entry Module,
DRAC (Diesel Engine)
5 Not Used
6 Cruise Control
7 Auxiliary Power Outlet
8 Crank
9 License Lamp, Parking Lamps,
Taillamps, Roof Marker Lamps,
Tailgate Lamps, Front
Sidemarkers, Fog Lamp Relay,
Door Switch Illumination,
Fender Lamps, Headlamp
Switch IlluminationFuse/Circuit
Breaker Usage
10 Not Used
11 Wiper Motor, Washer Pump
12 A/C, A/C Blower,
High Blower Relay
13 Power Amp, Cigarette Lighter,
Door Lock Relay,
Power Lumbar Seat
14 4WD Indicator, Cluster, Comfort
Controls, Instrument Switches,
Radio Illumination,
Chime Module
15 DRL Relay, Fog Lamp Relay
16 Front and Rear Turn Signals,
Back
-Up Lamps, BTSI Solenoid
17 Radio (Ignition)
18 4WAL/VCM, ABS,
Cruise Control
19 Radio (Battery)

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6-74
Name Usage
ECM
-B Fuel Pump, PCM/VCM
RR DEFOG Rear Window Defogger
IGN
-E Auxiliary Fan Relay Coil,
A/C Compressor Relay,
Hot Fuel Module, Dual Tanks
HORN Horn, Underhood Lamps
AUX FAN Auxiliary FanName Usage
ECM
-1 Injectors, PCM/VCM, Fuel
Solenoid (Diesel Engine, Fuel
Control Module (Diesel Engine)
HTD ST
-FR Not Used
A/C Air Conditioning
HTD MIR Not Used
ENG
-1 Ignition Switch, EGR, Canister
Purge, EVRV Idle Coast Solenoid,
MAF, Heated O
2,
Fuel Heater (Diesel Engine),
Water Sensor (Diesel Engine),
Boost Solenoid (Diesel Engine),
EPR (Diesel Engine)
HTD ST
-RR Not Used
LIGHTING Headlamp and Panel Dimmer
Switch, Fog and Courtesy Fuses
BATT Battery, Fuse Block Busbar
IGN
-A Ignition Switch
IGN
-B Ignition Switch
ABS Anti
-Lock Brake Module
BLOWER High Blower Relay
STOP/HAZ Stoplamps
HEATED SEATS Not Used

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6-75
Replacement Bulbs
Exterior Lamps Quantity Number
Sealed Beam Headlamps 2 H6054
Composite Low
-Beam
Headlamps2 9006
Composite High
-Beam
Headlamps2 9005
Front Marker Lamp 2 194
Front Parking and
Turn Lamp4 2357NA
Rear Parking Lamp 2 3057
Rear Stop and Turn
Lamp2 3057
Back
-up Lamp2 3156
Fender Marker Lamp 4 194
Roof Marker Lamp 5 194
License Plate Lamp 2 194
Center High
-Mounted
Stoplamp4 921
Underhood Lamp 1 93
Pickup Box
Identification Lamp3 153R*Interior Lamps Quantity Number
Dome Lamps 2
211
-2
Reading Lamps 2
211
-2
Door Courtesy Lamps 2 194
Four
-Wheel-Drive
Indicator**1 194
Four
-Wheel-Drive
Shift Lever**1 194
Instrument Panel
Compartment Lamp1 194
Ashtray Lamp 1 194
Sunshade Vanity Mirror 1 74
* Peterson Manufacturing
** Manual Transfer Case

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9-5
Gages
Engine Coolant Temperature 2-69 . . . . . . . . . . . . . . . . . . . .
Engine Oil Pressure 2-72 . . . . . . . . . . . . . . . . . . . . . . . . . . .
Fuel 2-75 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Speedometer 2-63 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Tachometer 2-63 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Voltmeter 2-67 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Garage Door Opener 2-51 . . . . . . . . . . . . . . . . . . . . . . . . . . . .
GAWR 4-43 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Gear Positions, Automatic Transmission 2-16 . . . . . . . . . . . . .
Gear Positions, Manual Transmission 2-19, 2-20 . . . . . . . . . .
Glove Box 2-50 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
GM Mobility Program for Persons with Disabilities 8-5 . . . . .
GM Vehicle Care/Appearance Materials 6-68 . . . . . . . . . . . . .
Gross Axle Weight Rating 4-43 . . . . . . . . . . . . . . . . . . . . . . . .
Gross Vehicle Weight Rating 4-43 . . . . . . . . . . . . . . . . . . . . . .
Guide en Fran†ais ii. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
GVWR 4
-43 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Halogen Bulbs 6-39 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Hazard Warning Flashers 5-2 . . . . . . . . . . . . . . . . . . . . . . . . . .
Head Restraints 1-5 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Headlamps 2-41 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Bulb Replacement 6-39, 6-40 . . . . . . . . . . . . . . . . . . . . . . .
High/Low Beam Changer 2-36 . . . . . . . . . . . . . . . . . . . . . .
On Reminder 2-41 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Wiring 6-70 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Hearing Impaired, Customer Assistance 8-4 . . . . . . . . . . . . . .
Heating 3-4 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
High-Beam Headlamps 2-36 . . . . . . . . . . . . . . . . . . . . . . . . . .
Highway Hypnosis 4-33 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Hill and Mountain Roads 4
-34 . . . . . . . . . . . . . . . . . . . . . . . . .
Hitches, Trailer 4-55 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Hood
Checking Things Under 6
-8 . . . . . . . . . . . . . . . . . . . . . . . . .
Release 6-9 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Horn 2-35 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Hydraulic Clutch Fluid 6-24, 7-48 . . . . . . . . . . . . . . . . . . . . . .
Hydraulic Clutch System Check 7-42 . . . . . . . . . . . . . . . . . . .
Hydroplaning 4-30 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Ignition Positions 2-11 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Ignition Transmission Lock Check 7-44 . . . . . . . . . . . . . . . . .
Illuminated Entry 2-42 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Inflation, Tire 6-51 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Inside Day/Night Rearview Mirror 2-44 . . . . . . . . . . . . . . . . .
Inspections 7-46 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Brake System 7-47 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Drive Axle 7-47 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Exhaust Systems 7-46 . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Radiator and Heater Hose 7-46 . . . . . . . . . . . . . . . . . . . . . .
Steering 7-46 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Suspension 7-46 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Throttle Linkage 7-47 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Transfer Case (Four-Wheel Drive) 7-47 . . . . . . . . . . . . . . .
Instrument Panel 2-60 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Cleaning 6-63 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Cluster 2-62 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Fuse Block 6-71 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Intensity Control 2-42 . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Interior Lamps 2-42 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

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9-12
Warning Devices 5-3 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Warning Lights, Gages and Indicators 2-64 . . . . . . . . . . . . . . .
Warranty Information 8-9 . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Washer Fluid, Windshield 6-33, 7-48 . . . . . . . . . . . . . . . . . . .
Washing Your Vehicle 6-65 . . . . . . . . . . . . . . . . . . . . . . . . . . .
Weatherstrips 6-64, 7-42 . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
West Coast-Type Mirror 2-49 . . . . . . . . . . . . . . . . . . . . . . . . .
Wheel
Alignment 6
-58 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Nut Torque 5-28, 6-77 . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Replacement 6-58 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Wrench 5-21 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Windows 2-32 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Lockout Switch 2-34 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Manual 2-32 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Power 2
-33 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Sliding Rear 2-34 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Swing-Out 2-34 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Windshield Washer 2-38 . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Fluid 2-38, 6-33, 7-48 . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Fluid Level Check 7-41 . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Windshield Wipers 2-37 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Blade Replacement 6-49, 6-78 . . . . . . . . . . . . . . . . . . . . . .
Cleaning the Blades 6-64 . . . . . . . . . . . . . . . . . . . . . . . . . . .
Fuses 6-70 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Winter Driving 4-36 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Wiper Blades, Cleaning 6-64 . . . . . . . . . . . . . . . . . . . . . . . . . .
Wiring, Headlamp 6-70 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Wrench, Wheel 5-21 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .