Buick LaCrosse (2005–2009) fuse box and relay Diagrams
The Buick LaCrosse, produced from 2005 to 2009, demonstrates Buick’s commitment to blending comfort with performance in the mid-size sedan segment. Its advanced electrical system includes essential components such as the fuse box and relays.
The fuse box in the Buick LaCrosse 2005–2009 houses fuses designed to protect electrical circuits from overloads and short circuits, ensuring the safety of critical components like headlights, taillights, and power windows. Relays, serving as electrically controlled switches, manage the flow of electricity to systems such as the starter motor, fuel pump, and cooling fans, ensuring efficient and reliable operation.
Additional sophisticated electrical components in the Buick LaCrosse of this era include climate control systems, power-adjustable seats, and premium audio systems. These features rely on a robust electrical infrastructure to enhance comfort, convenience, and entertainment for occupants.
Understanding the layout and function of the fuse box and relays is crucial for maintaining and troubleshooting the Buick LaCrosse 2005–2009’s electrical systems. Regular inspection and maintenance of these components help ensure the vehicle’s reliability and performance, maintaining its reputation as a refined and dependable sedan in Buick’s lineup.
(2005–2009) Buick LaCrosse 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 LaCrosse 2005–2009 fuse assignment
Year of production: 2005, 2006, 2007, 2008, 2009
Passenger compartment fuse box
Fuse Box Location
It is located on the right side of the instrument panel, behind the cover.
Fuse box diagram
Assignment of the fuses and relays in the Passenger compartment
| Name | Description |
|---|---|
| DR/LCK TRUNK | Door Locks, Trunk |
| RFA/MOD | Remote Keyless Entry |
| PRK/SWTCH | Ignition Key Lock |
| CLSTR | Cluster |
| STR/WHL/ ILLUM | Steering Wheel Controls Illumination |
| ONSTAR/ALDL | OnStar®, Data Link |
| INT/ILLUM | Interior Lamps |
| PWR/SEAT | Power Seat |
| S/ROOF | Sunroof |
| CNSTR | Canister Vent |
| HVAC | Climate Control System |
| HAZRD | Turn Signal, Hazard |
| PRK/LAMP | Park Lamps |
| CHMSL/BKUP | Center-High-Mounted Stoplamp/Back-up Lamps |
| PWR/MIR | Power Mirrors |
| CRUISE | Cruise Control |
| RDO/AMP | Radio, Amplifier |
| HTD/SEAT | Heated Seats |
| HTD/MIR | Heated Mirrors |
| PWR/WNDW | Power Window |
| Relays | |
| RAP | Retained Accessory Power |
| PRK/LAMP | Park Lamp Relay |
| R/DEFOG | Rear Defogger Relay |
Fuse Box in the engine compartment
Fuse Box Location
Fuse box diagram (3.6L and 3.8L V6 engines)
Assignment of the fuses and relays in the engine compartment (3.6L & 3.8L V6 engines)
| № | Description |
|---|---|
| Mini Fuses | |
| 1 | Driver Side High-Beam |
| 2 | Passenger Side High-Beam |
| 3 | Driver Side Low-Beam |
| 4 | Passenger Side Low-Beam |
| 5 | Windshield Wiper |
| 6 | Washer/Regulated Voltage Control |
| 7 | Fog Lamps |
| 8 | Transmission Control Module |
| 9 | Supplemental Inflatable Restraint |
| 10 | Auxiliary Power |
| 11 | Horn |
| 12 | Emission |
| 13 | Air Conditioner Clutch |
| 14 | Oxygen Sensor |
| 15 | Powertrain Control Module |
| 16 | Powertrain Control Module, Electronic Throttle Control |
| 17 | Electronic Throttle Control |
| 18 | Display |
| 19 | Antilock Brake Solenoid |
| 20 | Fuel Injector |
| 21 | Transmission Solenoid |
| 22 | Fuel Pump |
| 23 | Antilock Brake System |
| 24 | Ignition |
| J-Style fuse | |
| 25 | Air Pump |
| 26 | Battery Main 1 |
| 27 | Battery Main 2 |
| 28 | Battery Main 3 |
| 29 | Fan 1 |
| 30 | Battery Main 4 |
| 31 | Antilock Brake System Motor |
| 32 | Fan 2 |
| 33 | Starter |
| Micro-Relays | |
| 34 | Headlamp High-Beam |
| 35 | Headlamp Driver Module |
| 36 | Fog Lamp |
| 37 | Ignition 1 |
| 38 | Air Conditioning Compressor |
| 39 | Horn |
| 40 | Powertrain |
| 41 | Fuel Pump |
| Mini-Relays | |
| 42 | Fan 1 |
| 43 | Fan 3 |
| 44 | Windshield Wiper High |
| 45 | Windshield Wiper |
| 46 | Fan 2 |
| 48 | Crank |
| 49-54 | Spare fuses |
| 55 | Fuse Puller |
| Diode | Air Conditioner Compressor Clutch Diode |
Fuse box diagram (5.3L V8 Engine)
Assignment of the fuses and relays in the engine compartment (5.3L V8 Engine)
| Name | Description |
|---|---|
| HVAC | Climate Control System |
| FUEL/PUMP | Fuel Pump |
| AIRBAG/ DISPLAY | Airbag, Display |
| COMPASS | Compass |
| ABS | Antilock Brake System |
| ETC/ECM | Electronic Throttle Control, Engine Control Module |
| A/C CMPRSR | Air Conditioning Compressor |
| INJ 1 | Injectors 1 |
| ECM/TCM | Engine Control Module, Transmission Control Module |
| TRANS | Transmission |
| EMISSIONS1 | Emissions 1 |
| ABS SOL | Antilock Brake Solenoid |
| ECM IGN | Engine Control Module, Ignition |
| INJ 2 | Injectors 2 |
| EMISSIONS2 | Emissions 2 |
| WPR | Windshield Wipers |
| AUX PWR | Auxiliary Power |
| WSW/RVC | Windshield Washer, Regulated Voltage Control |
| LT LO BEAM | Driver Side Low-Beam Headlamp |
| RT LO BEAM | Passenger Side Low-Beam Headlamp |
| FOG LAMPS | Fog Lamps |
| LT HI BEAM | Driver Side High-Beam Headlamp |
| HORN | Horn |
| RT HI BEAM | Passenger Side High-Beam Headlamp |
| BATT 4 | Battery 4 |
| BATT 1 | Battery 1 |
| STRTR | Starter |
| ABS MTR | Antilock Brake System Motor |
| BATT 3 | Battery 3 |
| BATT 2 | Battery 2 |
| FAN 2 | Cooling Fan 2 |
| FAN 1 | Cooling Fan 1 |
| Relays | |
| FUEL/PUMP | Fuel Pump |
| A/C CMPRSR | Air Conditioning Compressor |
| PWR/TRN | Powertrain |
| STRTR | Starter |
| FAN 1 | Cooling Fan 1 |
| FAN 2 | Cooling Fan 2 |
| FAN 3 | Cooling Fan 3 |
| HDM | Headlamp Driver Module |
Conclusion
For owners and enthusiasts of classic Buick LaCrosse models from 2005–2009, understanding the fuse box and relay systems is essential for vehicle maintenance. Regular inspection and maintenance of these components helped ensure the vehicle’s longevity and reliability, preserving its status as a symbol of Buick’s craftsmanship and innovation in the automotive industry during that era.