Buick Lucerne Fuse Box: What Each Fuse Does
From the 2011 Buick Lucerne owner's manual. 2 fuse boxes listed.
Engine Compartment Fuse Block
| Fuse | Circuit |
|---|---|
| 1 | Engine Control Module (ECM), Crank |
| 2 | Fuel Injectors Odd |
| 3 | Fuel Injectors Even |
| 4 | Air Conditioning Clutch |
| 5 | Air Injection Reactor (AIR) Solenoid |
| 6 | Oxygen Sensor |
| 7 | Emission Device |
| 8 | Transmission, Ignition 1 |
| 9 | Engine Control Module (ECM), Powertrain Control Module (PCM) |
| 10 | Climate Control System, Instrument Panel Cluster Ignition 1 |
| 11 | Airbag System |
| 12 | Horn |
| 13 | Windshield Wiper |
| 14 | Fog Lamps |
| 15 | Right High-Beam Headlamp |
| 16 | Left High-Beam Headlamp |
| 17 | Left Low-Beam Headlamp |
| 18 | Right Low-Beam Headlamp |
| 19 | Windshield Washer Pump Motor |
| 20 | Left Front Cornering Lamp |
| 21 | Right Front Cornering Lamp |
| 22 | Air Pump (J-Case) |
| 23 | Antilock Brake System (ABS) (J-Case) |
| 24 | Starter (J-Case) |
| 25 | Antilock Brake System (ABS) Motor (J-Case) |
| 26 | Cooling Fan 2 (J-Case) |
| 27 | Cooling Fan 1 (J-Case) |
| 29 | Powertrain |
| 30 | Starter |
| 31 | Cooling Fan 2 |
| 32 | Cooling Fan 3 |
| 33 | Cooling Fan 1 |
| 34 | Air Conditioning Clutch |
| 35 | Air Injection Reactor (AIR) Solenoid |
| 36 | Ignition |
| 37 | Air Pump |
Rear Underseat Fuse Block
Location: Under the rear seat on the driver side; the rear seat cushion must be removed to access it.
| Fuse | Circuit |
|---|---|
| 1 | Fuel Pump |
| 2 | Left Park Lamp |
| 3 | Not Used |
| 4 | Right Park Lamp |
| 5 | Engine Control Module (ECM)/ Transmission Control Module (TCM) |
| 6 | Memory Module |
| 7 | Not Used |
| 8 | Steering Wheel Illumination |
| 9 | Front Heated/Cooled Seat Module |
| 10 | Run 2 - Heated/Cooled Seats |
| 11 | Not Used |
| 12 | RPA Module |
| 13 | PASS-Key® III System |
| 14 | Unlock/Lock Module |
| 15 | Magnetic Ride Control |
| 16 | Daytime Running Lamps (DRL) |
| 17 | Sunroof |
| 18 | Body Control Module (BCM) Dim |
| 19 | Body Control Module (BCM) |
| 20 | Run 1-Heated Steering Wheel |
| 21 | Ignition Switch |
| 22 | Driver Door Module |
| 23 | Not Used |
| 24 | Electronic Leveling Control Module |
| 25 | Body Control Module (Left Turn Signal) |
| 26 | Cigarette Lighter, Auxiliary Power Outlet |
| 27 | Not Used |
| 28 | Retained Accessory Power 1 (RAP) |
| 29 | Passenger Door Module |
| 30 | Sensing and Diagnostic Module |
| 31 | Accessory Power Outlets |
| 32 | Body Control Module (BCM) (Inadvertent) |
| 33 | Retained Accessory Power 2 (RAP) |
| 34 | CanisterVent Solenoid |
| 35 | Body Control Module (Courtesy) |
| 36 | Body Control Module (Right Turn Signal) |
| 37 | Trunk Release |
| 38 | Amplifier, Radio |
| 39 | Body Control Module (CHMSL) |
| 40 | Body Control Module |
| 41 | Not Used |
| 42 | OnStar® Module |
| 43 | Body Modules |
| 44 | Radio |
| 45 | Not Used |
| 46 | Rear Defogger (J-Case) |
| 47 | Electronic Leveling Control Compressor (J-Case) |
| 48 | Blower (J-Case) |
| 49 | Not Used |
| 50 | Terminating Resistor |
| 51 | Not Used |
| 52 | Rear Defogger |
| 53 | Electronic Leveling Control Compressor |
| 54 | Right Front Seat |
| 55 | Left Front Power Seat |
| 56 | Power Windows |
| 57 | Power Tilt Steering Wheel |
| 58 | Park Lamps |
| 59 | Fuel Pump |
| 60 | Not Used |
| 61 | Not Used |
| 62 | Unlock |
| 63 | Lock |
| 64 | Run |
| 65 | Daytime Running Lamps |
| 66 | Not Used |
| 67 | Trunk Release |
| 68 | Not Used |
| 69 | Not Used |
| 70 | Retained Accessory Power (RAP) |
Listings are copied as text from the manual's fuse tables (AI-assisted; every circuit name was matched against the cited pages 2026-10-18). Fuse layouts can differ by trim and year; check the label on the fuse box cover before replacing a fuse, and always use the same amp rating.
Confirm with your own manual, dipstick or door-jamb label.
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