1999 CHEVROLET S10 headlamp

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6-39
4. Turn the harness bulb socket counterclockwise to
remove it. Pull the bulb straight out to remove it
from the socket.
5. Push the new bulb into the socket until it snaps
into place.
6. Put the socket into the lamp assembly and turn it
clockwise until it is tight.
7. To replace the assembly, snap the outboard end of
the lamp assembly back into the vehicle. Then swing
the assembly in and snap it into place.8. Replace the headlamp assembly. Install the two
retaining clips.
Center High-Mounted Stoplamp
1. Remove the lens retaining screws.
2. Remove the lens.

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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.
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.
Tire Chains
NOTICE:
If your vehicle has P235/75R15, P235/70R15,
P235/55R16 or 31x10.50R15LT/C size tires, don't
use tire chains. They can damage your vehicle
because there's not enough clearance.
Use another type of traction device only if its
manufacturer recommends it for use on your
vehicle and tire size combination and road
conditions. Follow that manufacturer's
instructions. To help avoid damage to your
vehicle, drive slowly, readjust or remove the
device if it's contacting your vehicle, and don't
spin your wheels.
NOTICE: (Continued)

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Electrical System
Add-On Electrical Equipment
NOTICE:
Don't add anything electrical to your vehicle
unless you check with your dealer first. Some
electrical equipment can damage your vehicle
and the damage wouldn't be covered by
your warranty. Some add
-on electrical
equipment can keep other components from
working as they should.
Your vehicle has an air bag system. Before attempting to
add anything electrical to your vehicle, see ªServicing
Your Air Bag
-Equipped Vehicleº in the Index.
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 or ice, the wiper will stop until the motor cools. If
the overload is caused by some electrical problem, 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.

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Fuse/Circuit
BreakerUsage
A Not Used
B Not Used
1 Not UsedFuse/Circuit
BreakerUsage
2 Cigarette Lighter, Data Link
Connector
3 Cruise Control, Body Controls
TBC, Cruise Module, Cruise
Switch
4 Gages, Body Controls TBC,
Instrument Panel Cluster, B+
Power
5 Parking Lamps, Power Window
Switch, TBC, Ashtray Lamp
6 Not Used
7 Headlamp Switch, Body Controls
TBC, Headlamp Relay
8 Courtesy Lamps, Inadvertent
Power Relay
9 HVAC Control Head
10 Turn Signal
11 Instrument Panel Cluster, Engine
Controls
12 Interior Illumination

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Name Usage
TRL TRN Not Used
TRR TRN Not Used
TRL B/U Not Used
VEH B/U Vehicle Back
-Up Lamps
RT TURN Right Turn Signal FrontName Usage
LT TURN Left Turn Signal Front
HDLP W/W Not Used
LT TRN Left Turn Signal Rear
RT TRN Right Turn Signal Rear
RR PRK Right Rear Parking Lamps
TRL PRK Not Used
LT HDLP Left Headlamp
RT HDLP Right Headlamp
FR PRK Front Parking Lamps
INT BAT I/P Fuse Block Feed
ENG I Engine Sensors/Solenoids, MAF,
CAM, PURGE, VENT
ECM B Engine Control Module, Fuel
Pump Module, Oil Pressure
ABS Anti
-Lock Brake System
ECM I Engine Control Module Injectors
BTSI Brake
-Transmission Shift
Interlock

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Replacement Bulbs
Lamps Quantity Number
Halogen Headlamps, Composite Low
-Beam2 9006 HB4
Halogen Headlamps, Composite High
-Beam2 9005 HB3
Tail and Stoplamps 2 3057
Front Sidemarker Lamps 2 194
Front Turn Signal Lamps 2 3157NA
Center High
-Mounted Stoplamp2 577
Capacities and Specifications
Engine 2.2L L4 ªVORTECº 4300 V6 ªVORTECº 4300 V6
Type L4 V6 V6
VIN Code 4 X W
Firing Order
1
-3-4-21-6-5-4-3-21-6-5-4-3-2
Horsepower (T Series) N/A 180 at 4,400 rpm 190 at 4,400 rpm
Horsepower (S Series) 120 at 5,000 rpm 175 at 4,400 rpm 180 at 4,400 rpm
Thermostat Specification
195
F (91
C) 195
F (91
C) 195
F (91
C)
Spark Plug Gap 0.040 inches
(1.01 mm)0.060 inches
(1.52 mm)0.060 inches
(1.52 mm)

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Section 9 Index
A
ccessory Power Outlets 2-49 . . . . . . . . . . . . . . . . . . . . . . . .
Adding Equipment to the Outside of Your Vehicle 6-3 . . . . . .
Adding Sound Equipment 3-23 . . . . . . . . . . . . . . . . . . . . . . . .
Add-On Equipment 4-43 . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Air Bag 1-20 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Adding Equipment 1-30 . . . . . . . . . . . . . . . . . . . . . . . . . . . .
How Does it Restrain 1-25 . . . . . . . . . . . . . . . . . . . . . . . . . .
How it Works 1-23 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Location 1-23 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Readiness Light 1-22, 2-56 . . . . . . . . . . . . . . . . . . . . . . . . .
Servicing 1-30 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
What Makes it Inflate 1-24 . . . . . . . . . . . . . . . . . . . . . . . . . .
What Will You See After it Inflates 1-25 . . . . . . . . . . . . . . .
When Should it Inflate 1-24 . . . . . . . . . . . . . . . . . . . . . . . . .
Air Bag Off Light 1-28, 2-56 . . . . . . . . . . . . . . . . . . . . . . . . . .
Air Bag Off Switch 1-26 . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Air Bag System 1-20 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Air Cleaner 6-16, 6-70 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Air Conditioning 3-4 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Air Conditioning Refrigerants 6-69 . . . . . . . . . . . . . . . . . . . . .
Alignment and Balance, Tire 6-49 . . . . . . . . . . . . . . . . . . . . . .
Aluminum Wheels, Cleaning 6-56 . . . . . . . . . . . . . . . . . . . . . .
Antenna, Fixed 3-25 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Anti-Lock Brake System Warning Light 2-60, 4-7 . . . . . . . . .
Anti-Lock Brakes 4-7 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Appearance Care 6-51 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Appearance Care and Materials 6-59 . . . . . . . . . . . . . . . . . . . . Arbitration Program 8
-4 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Armrest, Storage 2-47 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Ashtrays 2-48 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Audio System Tips 3-23 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Audio Systems 3-6 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Automatic Headlamp System 2-41 . . . . . . . . . . . . . . . . . . . . . .
Automatic Transmission
Check 7
-43 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Fluid 6-17, 6-68, 7-48 . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Operation 2-18 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Park Mechanism Check 7-45 . . . . . . . . . . . . . . . . . . . . . . . .
Shifting 2-18 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Axle
Front 6
-24 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Rear 6-22 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Battery 6-35 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Charge Light 2-58 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Jump Starting 5-3 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Replacement, Keyless Entry 2-7 . . . . . . . . . . . . . . . . . . . . .
Run-Down Protection 2-44 . . . . . . . . . . . . . . . . . . . . . . . . .
Warnings 5-3, 5-4 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
BBB Auto Line 8-4 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Better Business Bureau Mediation 8-4 . . . . . . . . . . . . . . . . . . .
Brake Fluid 6-31 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Brake, Parking 2-26 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Brake System Warning Light 2-60 . . . . . . . . . . . . . . . . . . . . . .

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9-4
Exhaust, Engine 2-31, 4-39 . . . . . . . . . . . . . . . . . . . . . . . . . . .
Exit Lighting 2-44 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Express-Down Window 2-33 . . . . . . . . . . . . . . . . . . . . . . . . . .
Extender, Safety Belt 1-52 . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Fabric Cleaning 6-52 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Fifth Gear, Manual Transmission 2-22 . . . . . . . . . . . . . . . . . . .
Filling a Portable Fuel Container 6-7 . . . . . . . . . . . . . . . . . . . .
Filling Your Tank 6-5 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Filter
Air 6
-16, 6-70 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Remote Oil 6-15 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Finish Care 6-56 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Finish Damage 6-57 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
First Gear
Automatic Transmission 2
-21 . . . . . . . . . . . . . . . . . . . . . . .
Manual Transmission 2-21 . . . . . . . . . . . . . . . . . . . . . . . . . .
Flashers, Hazard Warning 5-2 . . . . . . . . . . . . . . . . . . . . . . . . .
Flash-To-Pass Feature 2-36 . . . . . . . . . . . . . . . . . . . . . . . . . . .
Flat Tire, Changing 5-19 . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Fluids and Lubricants 7-48 . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Fog Lamp Switch 2-43 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Foreign Countries, Fuel 6-5 . . . . . . . . . . . . . . . . . . . . . . . . . . .
Fourth Gear, Manual Transmission 2-22 . . . . . . . . . . . . . . . . .
Four-Wheel Drive 2-23, 6-23 . . . . . . . . . . . . . . . . . . . . . . . . .
French Language Manual ii. . . . . . . . . . . . . . . . . . . . . . . . . . .
Front Axle 6
-24 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Front Map Lamps 2-44 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Front Storage Area 2-47 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Fuel 6-3 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Filling a Portable Container 6-7 . . . . . . . . . . . . . . . . . . . . . .
Filling Your Tank 6-5 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Foreign Countries 6
-5 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Gage 2-66 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Fuel Tank Capacity 6-69 . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Fuse Block
Engine Compartment 6
-64 . . . . . . . . . . . . . . . . . . . . . . . . . .
Instrument Panel 6-62 . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Fuses and Circuit Breakers 6-62 . . . . . . . . . . . . . . . . . . . . . . .
Gages
Engine Coolant Temperature 2-61 . . . . . . . . . . . . . . . . . . . .
Engine Oil Pressure 2-64 . . . . . . . . . . . . . . . . . . . . . . . . . . .
Fuel 2-66 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Voltmeter 2-59 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Gas Cap 6-5 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
GAWR 4-41 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Gear Positions 2-18 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Glove Box 2-46 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
GM Mobility for Persons with Disabilities 8-5 . . . . . . . . . . . .
Gross Axle Weight Rating 4-41 . . . . . . . . . . . . . . . . . . . . . . . .
Gross Vehicle Weight Rating 4-40 . . . . . . . . . . . . . . . . . . . . . .
Guide en Fran†ais ii. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
GVWR 4
-40 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Halogen Bulbs 6-35 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Hazard Warning Flashers 5-2 . . . . . . . . . . . . . . . . . . . . . . . . . .
Headlamp Replacement 6-36 . . . . . . . . . . . . . . . . . . . . . . . . . .
Headlamps 2-41 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Bulb Replacement 6-36 . . . . . . . . . . . . . . . . . . . . . . . . . . . .
High/Low Beam Changer 2-36 . . . . . . . . . . . . . . . . . . . . . .
Wiring 6-61 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Headlamps On Reminder 2-42 . . . . . . . . . . . . . . . . . . . . . . . . .