Buick Century (2004 – 2005) – fuse box diagram
Year of production: 2004, 2005
Instrument Panel Fuse Block
Some fuses are located in a fuse block on the passenger’s side of the instrument panel.
| Circuit Breakers | Usage |
| TIRE RESET | Tire Inflation Monitor Reset Button |
| PWR/WNDW PWR S/ROOF | Power Windows, Power Sunroof |
| R/DEFOG | Rear Window Defogger |
| PWR/ SEAT | Power Seat |
| Blank | Not Used |
| Fuses | Usage |
| PRK/LCK | Ignition Key Solenoid |
| Blank | Not Used |
| Blank | Not Used |
| PCM, BCM, U/H | Ignition Signal: Hot in Run and Start, Powertrain Control Module, Body Control Module, Underhood Relay |
| RADIO PREM. SOUND | Not Used |
| PWR MIR | Power Mirrors |
| Blank | Not Used |
| INT/ILLUM | Panel Dimming |
| Blank | Not Used |
| IGN 0: CLSTR, CM & BCM | Ignition Signal: Hot in Run, Unlock and Start; Cluster, Powertrain Control Module, Body Control Module |
| Blank | Not Used |
| Blank | Not Used |
| Blank | Not Used |
| ACCY PWR BUS | Interior Lamps |
| DR/ LCK | Door Locks |
| Blank | Not Used |
| R/LAMPS | Taillamps, License Plate Lamps |
| Blank | Not Used |
| Blank | Not Used |
| CRUISE | Cruise Control |
| Blank | Not Used |
| CLSTR | Instrument Panel Cluster |
| LTR | Cigarette Lighter |
| STOP LAMPS | Stoplamps |
| ONSTAR | OnStar® |
| PRK/LGHT | Parking Lamps |
| Blank | Not Used |
| CRNK SIG, BCM, CLSTR | Crank Signal, Body Control Module, Cluster, Powertrain Control Module |
| HVAC | Ignition Signal, Heating, Ventilation, and Air Conditioning Control Head |
| BTSI (REGAL) | Not Used |
| AIR BAG | Air Bag |
| BCM PWR | Body Control Module |
| HAZARD | Hazard Warning Flashers |
| LH HTD SEAT | Not Used |
| Blank | Not Used |
| BCM ACCY | Ignition Signal: Hot in ACCESSORY and RUN, Body Control Module |
| Blank | Not Used |
| LOW BLWR | Low Blower |
| ABS | Anti-Lock Brakes |
| TRN SIG | Turn Signals, Cornering Lamps |
| RADIO, HVAC, RFA, CLSTR ALDL | Radio, Heating Ventilation and Air Conditioning Head; Remote Keyless Entry, Cluster |
| HI BLWR | High Blower |
| RH HTD SEAT | Not Used |
| STR/WHL/ CNTRL | Audio Steering Wheel Controls |
| WPR | Windshield Wipers |
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.
| Fuses | USage |
| 1 | Anti-Lock Brake System |
| 2 | Starter Solenoid |
| 3 | Power Seat, Rear Window Defogger |
| 4 | High Blower, Hazard Flasher, Stoplamps, Power Mirror, Door Locks |
| 5 | Ignition Switch, Stoplamps, Anti-Lock Brake System, Turn Signals, Cluster, Air Bag, Daytime Running Lamps Module |
| 6 | Cooling Fan |
| 7 | Retained Accessory Power, Remote Keyless Entry, Data Link, Heating, Ventilation, and Air Conditioning Head; Cluster, Radio, Cigarette Lighter |
| 8 | Ignition Switch, Wipers, Audio Steering Wheel Controls, Body Control Module, Power Windows, Sunroof, Heating, Ventilation, and Air Conditioning Controls; Daytime Running Lamps, Rear Window Defogger Relay |
| 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 | Air Conditioner Compressor Clutch |
| 24 | Cooling Fan |
| 25 | Electronic Ignition |
| 26 | Transaxle |
| 27 | Horn |
| 28 | Fuel Injector |
| 29 | Oxygen Sensor |
| 30 | Engine Emissions |
| 31 | Fog Lamps |
| 32 | Right Headlamp |
| 33 | Rear Compartment Release |
| 34 | Parking Lamps |
| 35 | Fuel Pump |
| 36 | Left Headlamp |
| 37 | Not Used |
| 38 | Not Used |
| 39 | Not Used |
| 40 | Not Used |
| 41 | Not Used |
| 42 | Not Used |
| 43 | Not Used |
| Air Conditioner Compressor Clutch Diode |
WARNING: Terminal and harness assignments for individual connectors will vary depending on vehicle equipment level, model, and market.