1999 CHEVROLET ASTRO ignition

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4-23

Keep your vehicle in good shape. Check all fluid
levels and also the brakes, tires, cooling system and
transmission. These parts can work hard on
mountain roads.

Know how to go down hills. The most important
thing to know is this: let your engine do some of the
slowing down. Shift to a lower gear when you go
down a steep or long hill.
CAUTION:
If you don't shift down, your brakes could get so
hot that they wouldn't work well. You would then
have poor braking or even none going down a
hill. You could crash. Shift down to let your
engine assist your brakes on a steep
downhill slope.
CAUTION:
Coasting downhill in NEUTRAL (N) or with the
ignition off is dangerous. Your brakes will have to
do all the work of slowing down. They could get so
hot that they wouldn't work well. You would then
have poor braking or even none going down a hill.
You could crash. Always have your engine running
and your vehicle in gear when you go downhill.

Know how to go uphill. You may want to shift down
to a lower gear. The lower gears help cool your engine
and transmission, and you can climb the hill better.

Stay in your own lane when driving on two
-lane
roads in hills or mountains. Don't swing wide or cut
across the center of the road. Drive at speeds that let
you stay in your own lane.

As you go over the top of a hill, be alert. There could be
something in your lane, like a stalled car or an accident.

You may see highway signs on mountains that warn of
special problems. Examples are long grades, passing or
no
-passing zones, a falling rocks area or winding
roads. Be alert to these and take appropriate action.

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5-4
2. Get the vehicles close enough so the jumper cables
can reach, but be sure the vehicles aren't touching
each other. If they are, it could cause a ground
connection you don't want. You wouldn't be able to
start your vehicle, and the bad grounding could
damage the electrical systems.
3. To avoid the possibility of the vehicles rolling, set
the parking brake firmly on both vehicles involved in
the jump start procedure. Put an automatic
transmission in PARK (P).
4. Turn off the ignition on both vehicles. Unplug
unnecessary accessories plugged into the cigarette
lighter or accessory power outlets. Turn off all lamps
that aren't needed as well as radios. This will avoid
sparks and help save both batteries. In addition, 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.
5. Open the hoods and locate the batteries. Find
the positive (+) and negative (
-) terminals on
each battery.
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 battery has enough water. You
don't need to add water to the ACDelco
Freedom

battery 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. If you accidentally get it in
your eyes or on your skin, flush the place with
water and get medical help immediately.

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6-65
Fuse/Circuit
Breaker Usage
UPFITTER
-BATT Upfitter Battery Power Stud,
Trailer Wiring Harness
UPFITTER
-ACCY Upfitter Accessory Relay
Spare Not used
Fuse Puller*
Spare Not used
Spare Not used
ECM
-1B Fuel Pump Relay and Motor,
VCM, Oil Pressure
Switch/Sender
HORN Horn Relay and Horn
A/C COMP A/C Enable Relay and
Compressor
ATC Active Transfer Case
-L Van
ENG
-I Oxygen Sensors, Camshaft
Position Sensor, Mass Air Flow
Sensor, Evaporative Emission
Canister Purge Solenoid, Linear
EGR Valve Solenoid, VCM
EGR HI
IGN
-E A/C Enable Relay CoilFuse/Circuit
Breaker Usage
ECM
-I Fuel Injectors 1-6, Crankshaft
Position Sensor, VCM, Coil
Driver Module (EST)
LIGHTING Park Lamps Fuse, DRL Fuse,
Headlamp and Panel Dimmer
Switch
BATT Steering/Security Fuse, Courtesy
Fuse, ACSY CB, Stop/Hazard
Fuse, Auxiliary Power Fuse,
Cigarette Lighter Fuse, Radio
Battery Fuse
IGN A Starter Relay, Ignition Switch
IGN B Ignition Switch
ABS Electronic Brake Control
Module
A/C Blower Motor Resistor, Blower
Relay
RR HTR/AC Auxiliary Heater, A/C Relay
HTD MIR/RR
DEFOGRear Window Defogger
*A fuse puller is included in the underhood electrical
center. You will also find spare fuses.

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7-44
Ignition Transmission Lock Check
While parked, and with the parking brake set, try to turn
the ignition key to LOCK in each shift lever position.

The key should turn to LOCK only when the shift
lever is in PARK (P).

The key should come out only in LOCK.
Parking Brake and Automatic Transmission
PARK (P) Mechanism Check
CAUTION:
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
it begins to roll. Be ready to apply the regular
brake at once should the vehicle begin to move.
Park on a fairly steep hill, with the vehicle facing
downhill. Keeping your foot on the regular brake, set
the parking brake.

To check the parking brake's holding ability:
With the engine running and transmission in
NEUTRAL (N), 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 (P) mechanism's holding ability:
With the engine running, shift to PARK (P). Then
release all brakes.
Underbody Flushing Service
At least every spring, use plain water to flush any
corrosive materials from the underbody. Take care to
clean thoroughly any areas where mud and other debris
can collect.

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9-5
Gages
Engine Coolant Temperature 2-63 . . . . . . . . . . . . . . . . . . . .
Engine Oil Pressure 2-66 . . . . . . . . . . . . . . . . . . . . . . . . . . .
Fuel 2-69 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Speedometer 2-59 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Voltmeter 2-61 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Garage Door Opener 2-44 . . . . . . . . . . . . . . . . . . . . . . . . . . . .
GAWR 4-28 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Gear Positions, Automatic Transmission 2-20 . . . . . . . . . . . . .
Glove Box 2-41 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
GM Mobility for Persons with Disabilities 8-5 . . . . . . . . . . . .
GM Vehicle Care/Appearance Materials 6-58 . . . . . . . . . . . . .
Gross Axle Weight Rating 4-28 . . . . . . . . . . . . . . . . . . . . . . . .
Gross Vehicle Weight Rating 4-28 . . . . . . . . . . . . . . . . . . . . . .
Guide en Fran†ais ii. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
GVWR 4
-28 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Halogen Bulbs 6-36 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Hatch Release 2-13 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Hazard Warning Flashers 5-2 . . . . . . . . . . . . . . . . . . . . . . . . . .
Head Restraints 1-5 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Headlamps 2-37 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Bulb Replacement 6-37, 6-38 . . . . . . . . . . . . . . . . . . . . . . .
High/Low Beam Changer 2-32 . . . . . . . . . . . . . . . . . . . . . .
On Reminder 2-37 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Wiring 6-60 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Hearing Impaired, Customer Assistance 8-4 . . . . . . . . . . . . . .
Heating 3-6 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
High-Beam Headlamps 2-32 . . . . . . . . . . . . . . . . . . . . . . . . . .
Highway Hypnosis 4-22 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Hill and Mountain Roads 4-22 . . . . . . . . . . . . . . . . . . . . . . . . . Hitches, Trailer 4
-34 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Hood
Checking Things Under 6
-8 . . . . . . . . . . . . . . . . . . . . . . . . .
Prop 6-9 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Release 6-8 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Horn 2-31 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Hydroplaning 4-18 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Ignition Positions 2-16 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Ignition Transmission Lock Check 7-44 . . . . . . . . . . . . . . . . .
Inflation, Tire 6-44 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Inside Day/Night Rearview Mirror 2-40 . . . . . . . . . . . . . . . . .
Inspections 7-45 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Brake System 7-46 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Drive Axle 7-46 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Engine Cooling System 7-45 . . . . . . . . . . . . . . . . . . . . . . . .
Exhaust Systems 7-45 . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Steering 7-45 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Suspension 7-45 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Throttle System 7-46 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Transfer Case (All-Wheel Drive) 7-46 . . . . . . . . . . . . . . . .
Instrument Panel 2-56 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Brightness Control 2-37 . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Cleaning 6-54 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Cluster 2-58 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Fuse Block 6-61 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Interior Lamps 2-38 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Jack, Tire 5-20 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Jump Starting 5-3 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

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9-6
Key Lock Cylinders Service 7-42 . . . . . . . . . . . . . . . . . . . . .
Keyless Entry System 2-7 . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Keys 2-2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Labels
Certification/Tire 4-28 . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Service Parts Identification 6-59 . . . . . . . . . . . . . . . . . . . . .
Tire-Loading Information 4-28 . . . . . . . . . . . . . . . . . . . . . .
Vehicle Identification Number 6-59 . . . . . . . . . . . . . . . . . . .
Lamps
Dome 2
-38 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Exterior 2-37 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Interior 2-38 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
On Reminder 2-37 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Latches, Seatback 1-5 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Leaving Your Vehicle 2-7 . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Leaving Your Vehicle with the Engine Running 2-25 . . . . . . .
Lighter 2-49 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Lights
Air Bag Readiness 1
-28, 2-60 . . . . . . . . . . . . . . . . . . . . . . .
Anti-Lock Brake System Warning 2-63, 4-7 . . . . . . . . . . . .
Brake System Warning 2-62 . . . . . . . . . . . . . . . . . . . . . . . . .
Charging System 2-61 . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Check Engine 2-64 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Check Gages 2-68 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Daytime Running Lamps Indicator 2-68 . . . . . . . . . . . . . . .
Safety Belt Reminder 1-13, 2-60 . . . . . . . . . . . . . . . . . . . . .
Security 2-67 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Service AWD 2-68 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Service Engine Soon 2-64 . . . . . . . . . . . . . . . . . . . . . . . . . . Loading Your Vehicle 4
-28 . . . . . . . . . . . . . . . . . . . . . . . . . . .
Locks
Cylinders 7
-42 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Door 2-6 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Ignition Transmission Lock Check 7-44 . . . . . . . . . . . . . . .
Key Lock Cylinder Service 7-42 . . . . . . . . . . . . . . . . . . . . .
Power Door 2-6 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Sliding Door Child Security 2-11 . . . . . . . . . . . . . . . . . . . . .
Lubricants and Fluids 7-47 . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Lubrication Service, Body 7-42 . . . . . . . . . . . . . . . . . . . . . . . .
Luggage Carrier 2-48 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Lumbar Controls 1-3 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Maintenance, Normal Replacement Parts 6-69 . . . . . . . . . . .
Maintenance Record 7-49 . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Maintenance Schedule 7-1 . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Long Trip/Highway 7-29 . . . . . . . . . . . . . . . . . . . . . . . . . . .
Long Trip/Highway Definition 7-6 . . . . . . . . . . . . . . . . . . .
Long Trip/Highway Intervals 7-6 . . . . . . . . . . . . . . . . . . . . .
Owner Checks and Services 7-41 . . . . . . . . . . . . . . . . . . . . .
Periodic Maintenance Inspections 7-45 . . . . . . . . . . . . . . . .
Recommended Fluids and Lubricants 7-47 . . . . . . . . . . . . .
Scheduled Maintenance Services 7-4 . . . . . . . . . . . . . . . . . .
Short Trip/City 7-8 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Short Trip/City Definition 7-5 . . . . . . . . . . . . . . . . . . . . . . .
Short Trip/City Intervals 7-5 . . . . . . . . . . . . . . . . . . . . . . . .
Maintenance, Underbody 6-57 . . . . . . . . . . . . . . . . . . . . . . . . .
Maintenance When Trailer Towing 4-38 . . . . . . . . . . . . . . . . .
Malfunction Indicator Lamp 2-64 . . . . . . . . . . . . . . . . . . . . . .
Manual Front Seat 1-2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .