2003 BUICK REGAL Owner's Manual

Fuses Usage
CLUSTER Instrument Panel Cluster
CIGAR LTRCigarette Lighter, Auxiliary Power
Connection (Power Drop)
STOP LAMPS Stoplamps
ONSTAR OnStar
®
FRT PARK LPS Front Parking Lamps
POWER DROPAuxiliary Power Connection (Power
Drop): Hot in ACC and Run
CRANK
SIGNAL, BCM,
CLUSTERCrank Signal, Body Control Module,
Cluster, Powertrain Control Module
HVACIgnition Signal, Heating Ventilation
Air Conditioning Control Head
BTSI PARK
LOCKShifter Lock Solenoid
AIR BAG Air Bag
BCM PWR Body Control Module
HAZARD Hazard Flashers
LH HEATED
SEATDriver’s Heated Seat
Fuses Usage
Blank Not Used
BCM ACCIgnition Signal: Hot in ACC and Run,
Body Control Module
Blank Not Used
LOW BLOWER Low Blower
ABS Anti-Lock Brakes
TURN
SIGNALS,
CORN LPSTurn Signals, Cornering Lamps
RADIO, HVAC,
RFA,
CLUSTERRadio, Heating Ventilation Air
Conditioning Head, Remote Keyless
Entry, Cluster
HIGH BLOWER High Blower
RH HEATED
SEATPassenger’s Heated Seat
STRG WHL
CONTAudio Steering Wheel Controls
WIPER Windshield Wipers
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2003 - Regal OM

Underhood Fuse Block
Some fuses and relays are located in the underhood
fuse block on the passenger’s side of the vehicle in the
engine compartment. SeeEngine Compartment
Overview on page 5-10or more information on location.
Fuses Usage
1 Anti-Lock Brake System
2 Starter Solenoid
3Power Seats, Rear Window
Defogger Heated Seats
4High Blower, Hazard Flasher,
Stoplamps, Power Mirror, Door
Locks
5Ignition Switch, BTSI, Stoplamps,
Anti-Lock Brake System, Turn
Signals, Cluster, Air Bag, Daytime
Running Lamps Module
6 Cooling Fan
7Retained Accessory Power, Keyless
Entry, Data Link, Heating Ventilation
Air Conditioning Head, Cluster,
Radio, Auxiliary Power (Power
Drop), Cigarette Lighter
8Ignition Switch, Wipers, Radio,
Steering Wheel Controls, Body
Control Module, Auxiliary Power
(Power Drop), Power Windows,
Sunroof, Heating Ventilation Air
Conditioning Controls, Daytime
Running Lamps, Rear Window
Defogger Relay
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2003 - Regal OM

Relays Usage
9 Cooling Fan 2
10 Cooling Fan 3
11 Starter Solenoid
12 Cooling Fan 1
13 Ignition Main
14 Air Pump (Optional)
15 Not Used
16 Horn
17 Fog Lamps
18 Not Used
19 Fuel Pump
Fuses Usage
20 Not Used
21 Generator
22 Engine Control Module
23 A/C Compressor Clutch
24 Cooling Fan
25 Electronic Ignition
Fuses Usage
26 Transaxle
27 Horn
28 Fuel Injector
29 Oxygen Sensor
30 Engine Emissions
31 Fog Lamps
32 Headlamp (Right)
33 Rear Compartment Release
34 Parking Lamps
35 Fuel Pump
36 Headlamp (Left)
37 Not Used
38 Not Used
39 Not Used
40 Not Used
41 Not Used
42 Not Used
43 Not Used
SYMBOL A/C Compressor Clutch Diode
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2003 - Regal OM

Capacities and Specications
Capacities and Specications
ApplicationCapacities
English Metric
Air Conditioning Refrigerant R134a 2.4 lbs 1.1 kg
Automatic Transaxle
Pan Removal and Replacement
After Complete Overhaul
When draining/replacing converter, morefluid will be needed.7.4 quarts
10.0 quarts7.0 L
9.5 L
Cooling System Including Reservoir 11.7 quarts 11.0 L
Engine Oil with Filter 4.5 quarts 4.3 L
Fuel Tank 17.0 gallons 64.0 L
Wheel Nut Torque 100 lb ft 140Y
All capacities are approximate. When adding, be sure tofill to the approximate level, as recommended in this
manual. SeePart D: Recommended Fluids and Lubricants on page 6-16.
Engine Specications
Engine VIN Code Displacement Firing Order
3800 V6
3800 Supercharged V6K
1231 CID 1–6–5–4–3–2
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2003 - Regal OM

Normal Maintenance Replacement Parts
Part Number
Engine Air Cleaner/FilterA1614C*
Engine Oil FilterType PF47*
Passenger Compartment Air Filter10406026
Spark Plugs
3800 V6Type 41–101*
Gap: 0.060 inches (1.52 mm)
3800 Supercharged V6Type 41–101*
Gap: 0.060 inches (1.52 mm)
Wiper Blade
Type
LengthShepherd’s Hook
22.0 inches (56.0 cm)
*ACDelco
®part number.
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✍NOTES
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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
Scheduled Maintenance...................................6-4
Part B: Owner Checks and Services................6-10
At Each Fuel Fill..........................................6-10
At Least Once a Month.................................6-10
At Least Twice a Year...................................6-11At Least Once a Year...................................6-11
Part C: Periodic Maintenance Inspections.........6-14
Steering, Suspension and Front Drive Axle
Boot and Seal Inspection............................6-14
Exhaust System Inspection............................6-14
Fuel System Inspection..................................6-15
Engine Cooling System Inspection...................6-15
Throttle System Inspection.............................6-15
Brake System Inspection................................6-15
Part D: Recommended Fluids and Lubricants. . . .6-16
Part E: Maintenance Record...........................6-17
Section 6 Maintenance Schedule
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2003 - Regal OM

Maintenance Schedule
Introduction
Important: Keep engine oil at the proper level and
change as recommended.
Have you purchased the GM Protection Plan? The Plan
supplements your new vehicle warranties. See your
Warranty and Owner Assistance booklet or your dealer
for details.
Your Vehicle and the Environment
Proper vehicle maintenance not only helps to keep your
vehicle in good working condition, but also helps the
environment. Improper vehicle maintenance can
even affect the quality of the air we breathe. Improper
fluid levels or the wrong tire inflation can increase
the level of emissions from your vehicle. To help protect
our environment, and to keep your vehicle in good
condition, be sure to maintain your vehicle properly.
Maintenance Requirements
Maintenance intervals, checks, inspections and
recommended fluids and lubricants as prescribed in this
manual are necessary to keep your vehicle in good
working condition. Any damage caused by failure
to follow scheduled maintenance may not be covered by
warranty.
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2003 - Regal OM