Learn about Buick Regal 2000-2004 fuse box and relay’s locations, functions, and maintenance tips for optimal vehicle electrical system.

The Buick Regal (2000-2004) is a mid-size sedan that combines classic styling with a comfortable, spacious interior, making it a popular choice for drivers seeking a refined, reliable vehicle. Its body style is a traditional four-door sedan with smooth, rounded lines and a focus on comfort and practicality. Designed for both daily commuting and longer journeys, the Regal includes a variety of electric features, such as power windows, locks, and advanced lighting, enhancing convenience for drivers and passengers alike.

To support these electrical features, the Regal is equipped with a fuse box and relay system that manages power distribution. The main fuse box is located under the dashboard on the passenger side, while another fuse box can be found in the engine compartment for critical systems like ignition and cooling fans. Relays, housed in these areas, control power to larger components, including the fuel pump and AC system. Regular inspection of the fuse box and relays is essential to prevent electrical issues and ensure smooth operation.

MUST READ: DYI – How to Check Car Fuses?

(2000-2004) Buick Regal fuse box and relay with Diagram

WARNING

  • Never replace a fuse with one that has a higher amperage rating.
  • A fuse with a too-high amperage could damage the electrical part and cause a fire.
  • On no account should fuses be repaired (e.g. patched up with tin foil or wire) as this may cause serious damage elsewhere in the electrical circuit or cause a fire.
  • If a fuse blows repeatedly, do not keep replacing it. Instead, have the cause for the repeated short circuit or overload tracked and fixed.
  • Terminal and harness assignments for individual connectors will vary depending on vehicle equipment level, model, and market.

Buick Regal 2000-2004 fuse assignment

Buick Regal Year of production: 2000, 2001, 2002, 2003, 2004

Location of Fuse Boxes

Buick Regal (2000-2004): Passenger compartment fuse panel location

Instrument Panel Fuse Block:

Some fuses are located in a fuse block on the passenger’s side of the instrument panel. Pull off the cover labeled FUSES to expose the fuse block.

Buick Regal (2000-2004): Engine compartment fuse box location

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.


Fuse Box Diagrams

2000

Instrument Panel Fuse Block
Buick Regal (2000): Instrument panel fuse box diagram

List of fuses in the Instrument Panel Fuse Block (2000)

NameDescription
Circuit Breaker
TIRE RESETTire Inflation Monitor Reset Button
PWR WINDOWS, PWR SUNROOFPower Windows, Power Sunroof
REAR DEFOGRear Window Defogger
POWER SEATSPower Seats
BlankNot Used
Fuse
PARK LOCKIgnition Key Solenoid
BlankNot Used
BlankNot Used
PCM, BCM, U/H RELAYIgnition Signal: Hot in Run and Start, Powertrain Control Module, Body Control Module, Underhood Relay
RADIO PREM. SOUNDRemote Radio Premium Sound
POWER MIRRORSPower Mirrors
BlankNot Used
PANEL DIMMINGPanel Dimming
BlankNot Used
IGN 0, CLUSTER, PCM, BCMIgnition Signal: Hot in Run, Unlock and Start, Cluster, Powertrain Control Module, Body Control Module
BlankNot Used
BlankNot Used
DRLDaytime Running Lamps Module
INADV POWER BUSInterior Lamps, Retained Accessory Power
DOOR LOCKSDoor Locks
BlankNot Used
TAIL LAMPS, LIC LAMPSTaillamps, License Lamps
RADIORadio
HEATED MIRRORHeated Mirrors
CRUISECruise Control
BlankNot Used
CLUSTERInstrument Panel Cluster
CIGAR LTR, DATA LINKCigarette Lighter, Auxiliary Power Connection (Power Drop), Data Link
STOP LAMPSStoplamps
BlankNot Used
FRT PARK LPSParking 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, HVAC Control Head
BTSI PARK LOCKShifter Lock Solenoid
AIR BAGAir Bag
BCM PWRBody Control Module
HAZARDHazard Flashers
LH HEATED SEATDriver’s Heated Seat
BlankNot Used
BCM ACCIgnition Signal: Hot in ACC and Run, Body Control Module
BlankNot Used
LOW BLOWERLow Blower
ABSAnti-Lock Brakes
TURN SIGNALS, CORN LPSTurn Signals, Cornering Lamps
RADIO, HVAC, RFA, CLUSTERRadio, HVAC Head, Remote Keyless Entry, Cluster
HIGH BLOWERHigh Blower
RH HEATED SEATPassenger’s Heated Seat
STRG WHL CONTAudio Steering Wheel Controls
WIPERWipers
Underhood Fuse Block
Buick Regal (2000): Engine compartment fuse box diagram

List of fuses in the Underhood Fuse Block (2000)

Description
Maxi fuse
1ABS
2Starter Solenoid
3Power Seats, Rear Defog, Heated Seats
4High Blower, Hazard Flasher, Stoplamps, Power Mirror, Door Locks
5Ignition Switch, BTSI, Stoplamps, ABS, Turn Signals, Cluster, Air Bag, DRL Module
6Cooling Fan
7Interior Lamps, Retained Accessory Power, Keyless Entry, CEL TEL, Data Link, HVAC Head, Cluster, Radio, AUX Power (Power Drop), Cigarette Lighter
8Ignition Switch, Wipers, Radio, Steering Wheel Controls, Body Control Module, AUX Power (Power Drop), Power Windows, Sunroof, HVAC Controls, DRL, Rear Defog Relay
Mini relay
9Cooling Fan 2
10Cooling Fan 3
11Starter Solenoid
12Cooling Fan 1
13Ignition Main
14Air Pump (Optional)
15A/C Clutch
16Horn
17Fog Lamps
18Fuel Pump, Speed Control (L67 only)
19Fuel Pump
Mini fuse
20Air Pump (Optional)
21Generator
22ECM
23A/C Compressor Clutch
24Cooling Fan
25Electronic Ignition
26Transaxle
27Horn
28Fuel Injector
29Oxygen Sensor
30Engine Emissions
31Fog Lamps
32Headlamp (Right)
33Rear Compartment Release
34Parking Lamps
35Fuel Pump
36Headlamp (Left)
37Spare
38Spare
39Spare
40Spare
41Spare
42Spare
43Fuse Puller
SYMBOLA/C Compressor Clutch Diode

2002

Instrument Panel Fuse Block
Buick Regal (2002): Instrument panel fuse box diagram

List of fuses in the Instrument Panel Fuse Block (2002)

NameUsage
Circuit Breaker
TIRE RESETTire Inflation Monitor Reset Button
PWR WINDOWS, PWR SUNROOFPower Windows, Power Sunroof
REAR DEFOGRear Window Defogger
POWER SEATSPower Seats
BlankNot Used
Fuse
PARK LOCKIgnition Key Solenoid
BlankNot Used
BlankNot Used
PCM, BCM, U/H RELAYIgnition Signal: Hot in Run and Start, Powertrain Control Module, Body Control Module, Underhood Relay
RADIO PREM. SOUNDRemote Radio Premium Sound
POWER MIRRORSPower Mirrors
BlankNot Used
PANEL DIMMINGPanel Dimming
BlankNot Used
IGN 0, CLUSTER, PCM, BCMIgnition Signal: Hot in Run, Unlock and Start, Cluster, Powertrain Control Module, Body Control Module
BlankNot Used
BlankNot Used
BlankNot Used
INADV POWER BUSInterior Lamps
DOOR LOCKSDoor Locks
TRAP ALERTTrap Alert
TAIL LAMPS, LIC LAMPSTaillamps, License Lamps
RADIORadio
HEATED MIRRORHeated Mirrors
CRUISECruise Control
BlankNot Used
CLUSTERInstrument Panel Cluster
CIGAR LTRCigarette Lighter, Auxiliary Power Connection (Power Drop)
STOP LAMPSStoplamps
ONSTAROnStar
FRT PARK LPSParking 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 BAGAir Bag
BCM PWRBody Control Module
HAZARDHazard Flashers
LH HEATED SEATDriver’s Heated Seat
BlankNot Used
BCM ACCIgnition Signal: Hot in ACC and Run, Body Control Module
BlankNot Used
LOW BLOWERLow Blower
ABSAnti-Lock Brakes
TURN SIGNALS, CORN LPSTurn Signals, Cornering Lamps
RADIO, HVAC, RFA, CLUSTERRadio, Heating Ventilation Air Conditioning Head, Remote Keyless Entry, Cluster
HIGH BLOWERHigh Blower
RH HEATED SEATPassenger’s Heated Seat
STRG WHL CONTAudio Steering Wheel Controls
WIPERWipers
Underhood Fuse Block
Buick Regal (2002): Engine compartment fuse box diagram

List of fuses in the Underhood Fuse Block (2002)

Usage
Maxi Fuse
1Anti-Lock Brake System
2Starter Solenoid
3Power Seats, Rear Defog, Heated Seats
4High Blower, Hazard Flasher, Stoplamps, Power Mirror, Door Locks
5Ignition Switch, BTSI, Stoplamps, ABS, Turn Signals, Cluster, Air Bag, DRL Module
6Cooling 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 Defog Relay
Mini Relay
9Cooling Fan 2
10Cooling Fan 3
11Starter Solenoid
12Cooling Fan 1
13Ignition Main
14Air Pump (Optional)
Micro Relay
15A/C Clutch
16Horn
17Fog Lamps
18Fuel Pump, Speed Control (L67 only)
19Fuel Pump
Mini Fuse
20Air Pump (Optional)
21Generator
22ECM
23A/C Compressor Clutch
24Cooling Fan
25Electronic Ignition
26Transaxle
27Horn
28Fuel Injector
29Oxygen Sensor
30Engine Emissions
31Fog Lamps
32Headlamp (Right)
33Rear Compartment Release
34Parking Lamps
35Fuel Pump
36Headlamp (Left)
37Spare
38Spare
39Spare
40Spare
41Spare
42Spare
43Fuse Puller
SYMBOLA/C Compressor Clutch Diode

2003

Instrument Panel Fuse Block
Buick Regal (2003): Instrument panel fuse box diagram

List of fuses in the Instrument Panel Fuse Block (2003)

Usage
Circuit Breakers
TIRE RESETTire Inflation Monitor Reset Button
PWR WINDOWSPower Windows
PWR SUNROOFPower Sunroof
REAR DEFOGRear Window Defogger
POWER SEATSPower Seats
BlankNot Used
Fuses
PARK LOCKIgnition Key Solenoid
BlankNot Used
BlankNot Used
PCM, BCM, U/H RELAYIgnition Signal: Hot in Run and Start, Powertrain Control Module, Body Control Module, Underhood Relay
RADIO PREM. SOUNDRemote Radio Premium Sound
POWER MIRRORSPower Mirrors
BlankNot Used
PANEL DIMMINGPanel Dimming
BlankNot Used
IGN 0, CLUSTER, PCM, BCMIgnition Signal: Hot in Run, Unlock and Start, Cluster, Powertrain Control Module, Body Control Module
BlankNot Used
BlankNot Used
BlankNot Used
INADV POWER BUSInterior Lamps
DOOR LOCKSDoor Locks
TRAP ALERTTrap Alert
TAIL LAMPS, LIC LAMPSTaillamps, License Lamps
RADIORadio
HEATED MIRRORNot Used
CRUISECruise Control
BlankNot Used
CLUSTERInstrument Panel Cluster
CIGAR LTRCigarette Lighter, Auxiliary Power Connection (Power Drop)
STOP LAMPSStoplamps
ONSTAROnStar
FRT PARK LPSFront 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 BAGAir Bag
BCM PWRBody Control Module
HAZARDHazard Flashers
LH HEATED SEATDriver’s Heated Seat
BlankNot Used
BCM ACCIgnition Signal: Hot in ACC and Run, Body Control Module
BlankNot Used
LOW BLOWERLow Blower
ABSAnti-Lock Brakes
TURN SIGNALS, CORN LPSTurn Signals, Cornering Lamps
RADIO, HVAC, RFA, CLUSTERRadio, Heating Ventilation Air Conditioning Head, Remote Keyless Entry, Cluster
HIGH BLOWERHigh Blower
RH HEATED SEATPassenger’s Heated Seat
STRG WHL CONTAudio Steering Wheel Controls
WIPERWindshield Wipers
Underhood Fuse Block
Buick Regal (2003): Engine compartment fuse box diagram

List of fuses in the Underhood Fuse Block (2003)

Usage
Fuses
1Anti-Lock Brake System
2Starter 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
6Cooling 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
Relays
9Cooling Fan 2
10Cooling Fan 3
11Starter Solenoid
12Cooling Fan 1
13Ignition Main
14Air Pump (Optional)
15Not Used
16Horn
17Fog Lamps
18Not Used
19Fuel Pump
Fuses
20Not Used
21Generator
22Engine Control Module
23A/C Compressor Clutch
24Cooling Fan
25Electronic Ignition
26Transaxle
27Horn
28Fuel Injector
29Oxygen Sensor
30Engine Emissions
31Fog Lamps
32Headlamp (Right)
33Rear Compartment Release
34Parking Lamps
35Fuel Pump
36Headlamp (Left)
37Not Used
38Not Used
39Not Used
40Not Used
41Not Used
42Not Used
43Not Used
SYMBOLA/C Compressor Clutch Diode

2004

Instrument Panel Fuse Block
Buick Regal (2004): Instrument panel fuse box diagram

List of fuses in the Instrument Panel Fuse Block (2004)

Usage
Circuit Breakers
TIRE RESETTire Inflation Monitor Reset Button
PWR/WNDW PWR S/ROOFPower Windows, Power Sunroof
R/DEFOGRear Window Defogger
PWR SEATPower Seat
BlankNot Used
Fuses
PRK/LCKIgnition Key Solenoid
BlankNot Used
BlankNot Used
PCM, BCM, U/HIgnition Signal: Hot in Run and Start, Powertrain Control Module, Body Control Module, Underhood Relay
RADIO PREM. SOUNDRemote Radio Premium Sound
PWR MIRPower Mirrors
BlankNot Used
INT/ILLUMPanel Dimming
BlankNot Used
IGN 0: CLSTR, PCM & BCMIgnition Signal: Hot in Run, Unlock and Start, Cluster, Powertrain Control Module, Body Control Module
BlankNot Used
BlankNot Used
BlankNot Used
ACCY PWR BUSInterior Lamps
DR/ LCKDoor Locks
BlankNot Used
R/LAMPSTaillamps, License Plate Lamps
BlankNot Used
CRUISECruise Control
BlankNot Used
CLSTRInstrument Panel Cluster
LTRCigarette Lighter
STOP LAMPSStoplamps
ONSTAROnStar
PRK/LGHTParking Lamps
BlankNot Used
CRNK SIG, BCM, CLSTRCrank Signal, Body Control Module, Cluster, Powertrain Control Module
HVACIgnition Signal, Heating, Ventilation and Air Conditioning Control Head
BTSIShifter Lock Solenoid
AIR BAGAir Bag
BCM PWRBody Control Module
HAZRDHazard Warning Flashers
LH HTD SEATDriver’s Heated Seat
BlankNot Used
BCM ACCYIgnition Signal: Hot in ACCESSORY and RUN, Body Control Module
BlankNot Used
LOW BLWERLow Blower
ABSAnti-Lock Brakes
TRN SIGTurn Signals, Cornering Lamps
RADIO, HVAC, RFA, CLSTR ALDLRadio; Heating Ventilation, and Air Conditioning Head; Remote Keyless Entry, Cluster
HI BLWRHigh Blower
RH HTD SEATPassenger’s Heated Seat
STR/WHL CNTRLAudio Steering Wheel Controls
WPRWindshield Wipers
Underhood Fuse Block
Buick Regal (2004): Engine compartment fuse box diagram

List of fuses in the Underhood Fuse Block (2004)

Usage
Fuses
1Anti-Lock Brake System
2Starter Solenoid
3Power Seats, Rear Window Defogger, Heated Seats
4High Blower, Hazard Flasher, Stoplamps, Power Mirror, Door Locks
5Ignition Switch, BTS Shifter Lock Solenoid, Stoplamps, Anti-Lock Brake System, Turn Signals, Cluster, Air Bag, Daytime Running Lamps Module
6Cooling Fan
7Retained Accessory Power (RAP), Remote Keyless Entry, Data Link, Heating, Ventilation and Air Conditioning Head, Cluster, Radio, Cigarette Lighter
8Ignition Switch, Windshield Wipers, Radio, Steering Wheel Controls, Body Control Module, Power Windows, Sunroof; Heating, Ventilation and Air Conditioning Controls; Daytime Running Lamps, Rear Window Defogger Relay
Relays
9Cooling Fan 2
10Cooling Fan 3
11Starter Solenoid
12Cooling Fan 1
13Ignition Main
14Air Pump (Optional)
15Not Used
16Horn
17Fog Lamps
18Not Used
19Fuel Pump
Fuses
20Not Used
21Generator
22Engine Control Module
23Air Conditioner Compressor Clutch
24Cooling Fan
25Electronic Ignition
26Transaxle
27Horn
28Fuel Injector
29Oxygen Sensor
30Engine Emissions
31Fog Lamps
32Right Headlamp
33Rear Compartment Release
34Parking Lamps
35Fuel Pump
36Left Headlamp
37Not Used
38Not Used
39Not Used
40Not Used
41Not Used
42Not Used
43Not Used
SYMBOLAir Conditioner Compressor Clutch Diode

Conclusion

Understanding the fuse box and relays in the Dodge Caravan is vital for diagnosing and fixing electrical issues. Regular maintenance of these components ensures that the Caravan’s features, from entertainment to engine performance, operate smoothly and without interruption.

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