2003 CHEVROLET ASTRO brake

12. Tighten the wheel nuts
firmly in a crisscross
sequence as shown.
Turn the ratchet
clockwise with the
UP mark facing you.
Incorrect wheel nuts or improperly tightened
wheel nuts can cause the wheel to come loose and even come
off. This could lead to an
accident. Be sure to use the correct wheel
nuts.
If you have to replace them, be sure to
get new
GM original equipment wheel nuts.
Stop somewhere as soon as you can and have
the nuts tightened with a torque wrench to the
proper torque specification. See “Capacities
and Specifications” in the Index for wheel
nut
torque specification.
Notice: Improperly tightened wheel nuts can lead
to brake pulsation and rotor damage. To avoid
expensive brake repairs, evenly tighten the wheel
nuts in the proper sequence and to the proper torque
specification. See “Capacities and Specifications”
in the index for the wheel nut torque specification.
13. Remove the wheel blocks.
Notice: Wheel covers won’t fit on your compact
spare.
If you try to put a wheel cover on your
compact spare, you could damage the cover or
the spare.
5-80

FuseKircuit Usage
Breaker
1
2
Stop/Turn/Hazard Lamps,
Center High Mounted Stop Lamp,
Anti-Lock Brakes
Radio Accy, Rear Seat
Audio Controls
FuseKircuit
Breaker
3
4
5
6
8
9
Usage
Courtesy Lamps, Glove Box Lamp,
Dome Reading Lamps, Vanity Mirror
Lamps, Courtesy Lamps
Daytime Running Lamps Relay,
Instrument Panel Cluster
Rear Defogger
Cruise Module, Truck Body Control Module, Instrument Panel Cluster,
Cruise Control Switch,
Electrochromic Mirror
Power Outlets, DLC,
Subwoofer Amplifier
Crank Circuit Fuse, ParWNeutral
Switch, Starter Enabler Relay
License Plate Lamp, Tailamps,
Parking Lamps, Ashtray Lamp,
Panel Lights, Trailer Taillamps,
Front and Rear Sidemarker Lamps,
Door Switch Illumination, Headlamp
Switch Illumination, Rear Seat
Audio Illumination, Truck Body
Control Module
5-94

13
14
15
16
Fuse/Circuit Usage Breaker
10 Air Bag System
11 Not Used
12 L, MI, M2 Blower Motor, Rear Air
Conditioning Relay Coil, Front Cont.
Temp. Door Motor, HI Blower Relay.
Defogger Timer Coil
Cigarette Lighter, Door Lock
Switches, Dutch Door Release Module
Cluster Illum, Climate Controls,
Chime Module, Radio Illumination,
Rear Heat Switch Illumination, Rear
Wipermasher Switch Illumination,
Rear Liftgate Switch Illumination,
Remote Cassette Illumination,
Overhead Console, Truck Body
Control Illurnination
Truck Body Module, Headlamp Relay
Front Turn Signals, Rear Turn
Signals, Trailer Turn Signals,
Back-up Lamps, Brake Transmission
Shift Interlock Solenoid 21
22
23
24
A
19
20
FuseKircuit
Usage
Breaker
17 Front Wipers, Front Washer Pump
18 VCM-lgn
3, VCM-Brake, Cruise
Stepper Motor Signal, ATC Module
Instrument Panel Radio: ATC
(Main Feed),
2000 Series (Standby)
PRNDUOdometer, TCC Enable and
PWM Solenoid, Shift A and Shift B
Solenoids, 3-2 Downshift Solenoid, Instrument Panel Cluster, VCM
Module
Powr Adjust Mirrors
Not Used
Rear Wiper, Rear Washer Pump
Not Used
(Circuit Breaker) Power Door Lock
Relay, 6-Way Power Seats
(Circuit Breaker) Power Windows
B
5-95

Fuse/Circuit Usage
Breaker
DIODE-I Air Conditioning
Blank Not Used
Blank
Not Used
Blank Not Used
LIGHTING Courtesy Fuse, Power Adjust
Mirrors Fuse, Truck Body Control
Battery Fuse
Power Accessory Circuit Breaker,
Stop/Hazard Fuse, Auxiliary Power
Fuse, Cigarette Lighter Fuse, Radio
Battery Fuse
BATT
Fuse/Circuit
Breaker
IGN A
IGN
B
ABS
Blank RAP
HTD MIRI
RR DEFOG
Usage
Starter Relay, Ignition Switch
Ignition Switch
Electronic Brake Control Module
Not Used Radio Accessory, Power Windows
Rear Window Defogger,
Climate Control Head
5-98

Section 6 Maintenance Schedule
Maintenance Schedule ............................... 6.2
Introduction
................................................... 6.2
Your Vehicle and the Environment
.................... 6-2
Maintenance Requirements
.............................. 6-2
How This Section
is Organized ......................... 6-3
Part
A: Scheduled Maintenance Services ........... 6.4
Using Your Maintenance Schedule
.................... 6.4
Selecting the Right Schedule
........................... 6-5
Short Trip/City Scheduled Maintenance
.............. 6.7
Long Trip/Highway Scheduled Maintenance
...... 6.18
Part B: Owner Checks and Services
................ 6.26
At Each Fuel Fill
.......................................... 6-26
At Least Once a Month
................................. 6.26
At Least Twice a Year
................................... 6.26 At
Least Once a Year
................................... 6-27
Part C: Periodic Maintenance inspections
......... 6.30
Steering. Suspension and Front Drive Axle
Boot and Seal Inspection
............................ 6.30
Exhaust System Inspection
............................ 6.30
Fuel System Inspection
.................................. 6.30
Engine Cooling System Inspection
................... 6.30
Throttle System Inspection
............................ -6-31
Transfer Case and Front Axle
(All-Wheel Drive) Inspection
....................... -6-31
Brake System Inspection
................................ 6.31
Part D: Recommended Fluids
and Lubricants
.......................................... 6.32
Part E: Maintenance Record
........................... 6.34
6-
1

Selecting the Right Schedule
First you’ll need to decide which of the two schedules
is right for your vehicle. Here’s how to decide which
schedule to follow:
Short Trip/City Definition
Follow the Short Trip/City Scheduled Maintenance if any
one of these conditions is true for your vehicle:
e
e
e
e
Most trips are less than 5 miles (8 km). This is
particularly important when outside temperatures
are below freezing.
Most trips include extensive idling (such as frequent
driving in stop-and-go traffic).
You frequently tow a trailer or use a carrier on top
of your vehicle.
If the vehicle is used for delivery service, police,
taxi or other commercial application.
One of the reasons you should follow this schedule if
you operate your vehicle under any of these conditions
is that these conditions cause engine oil to break
down sooner.
Short Trip/City Intervals
Every 3,000 Miles (5 000 km): Engine Oil and Filter
Change (or
3 months, whichever occurs first). Chassis
Lubrication (or
3 months, whichever occurs first).
Drive Axle Fluid Check.
Every 6,000 Miles (IO 000 km): Tire Rotation.
Every 15,000 Miles (25 000 km): Engine Air
Cleaner Filter Inspection,
if driving in dusty conditions.
Front Wheel Bearing Repack (two-wheel drive only)
(or at each brake relining, whichever occurs first).
Automatic Transmission Service (severe conditions only).
Every 30,000 Miles (50 000 km): Engine Air Cleaner
Filter Replacement. Fuel Filter Replacement.
Every 50,000 Miles (83 000 km): Automatic
Transmission Service (normal conditions).
Transfer Case Fluid Change.
Every 100,000 Miles (166 000 km): Spark Plug Wire
Inspection. Spark Plug Replacement. Positive
Crankcase Ventilation (PCV) Valve Inspection.
Every 150,000 Miles (240 000 km): Cooling System
Service (or every
60 months, whichever occurs
first). Engine Accessory Drive Belt Inspection.
These intervals only summarize maintenance services.
Be sure to follow the complete scheduled maintenance
on the following pages.
6-5

Long Trip/Highway Definition
Follow this scheduled maintenance only if none of
the conditions from the Short Trip/City Scheduled
Maintenance are true. Do not use this schedule
if the
vehicle is used for trailer towing, driven in a dusty area
or used
off paved roads. Use the Short Trip/City
schedule for these conditions.
Driving a vehicle with a fully warmed engine under
highway conditions will cause engine oil
to break
down slower.
Long Trip/Highway Intervals
Every 7,500 Miles (12 500 km): Engine Oil and Filter
Change (or every
12 months, whichever occurs first).
Chassis Lubrication (or
12 months, whichever
occurs first). Drive Axle Fluid Check. Tire Rotation.
Every 15,000 Miles (25 000 km): Automatic
Transmission Service (severe conditions only).
Every 30,000 Miles (50 000 km): Fuel Filter
Replacement. Engine Air Cleaner Filter Replacement.
Front Wheel Bearing Repack (two-wheel drive only)
(or at each brake relining, whichever occurs first).
Every 50,000 Miles (83 000 km): Automatic
Transmission Service (normal conditions).
Transfer Case Fluid Change.
Every 100,000 Miles (166 000 km): Spark Plug Wire
Inspection. Spark Plug Replacement. Positive
Crankcase Ventilation (PCV) Valve Inspection.
Every 150,000 Miles (240 000 km): Cooling System
Service (or every
60 months, whichever occurs first).
Engine Accessory Drive Belt Inspection.
These intervals only summarize maintenance services.
Be sure to follow the complete scheduled maintenance
on the following pages.
6-6

Short Trip/City Scheduled Maintenance
The services shown in this schedule up to 100,000 miles
(166 000 km) should be repeated after IQ0,OOQ miles
(166 000 km) at the same intervals for the life of
this vehicle. The services shown at
150,000 miles
(240
000 km) should be repeated at the same interval
after
150,000 miles (240 000 km) for the life of this
vehicle.
See
Part B: Owner Checks and Services on page 6-26
and Part C: Periodic Maintenance Inspections on
page 6-30.
Footnotes
t The U.S. Environmental Protection Agency or the
California Air Resources Board has determined that the
failure to perform this maintenance item will not nullify
the emission warranty or limit recall liability prior to
the completion of the vehicle’s useful life. We, however,
urge that all recommended maintenance services be
performed at the indicated intervals and the
maintenance be recorded.
# Lubricate the front suspension, ball joints and kingpin
bushings, steering linkage, parking brake cable
guides and brake pedal springs.
+ A good time to check your brakes is during tire
rotation. See Brake System Inspection
on page 6-3 1.
3,000 Miles (5 000 km)
0 Change engine oil and filter (or every 3 months,
0 Lubricate chassis components (or every 3 months,
0 Check readfront axle fluid level and add fluid as
whichever
occurs first).
An Emission Control Service.
whichever occurs first). (See footnote #.)
needed. Check constant velocity joints and axle seals
for leaking.
6,000 Miles (IO 000 km)
0
0
0
0
Change engine oil and filter (or every 3 months,
whichever occurs first).
An Emission Control Service.
Lubricate chassis components (or every 3 months,
whichever occurs first).
(See footnote #.)
Check readfront axle fluid level and add fluid as
needed. Check constant velocity joints and axle seals
for leaking.
Rotate tires. See
Tire Inspection and Rotation on
page 5-64
for proper rotation pattern and additional
information.
(See footnote +.)
9,000 Miles (15 000 km)
0 Change engine oil and filter (or every 3 months,
0 Lubricate chassis components (or every 3 months,
0 Check readfront axle fluid level and add fluid as
whichever
occurs first).
An Emission Control Service.
whichever occurs first). (See footnote #.)
needed. Check constant velocity joints and axle seals
for leaking.
6-7