Cadillac DeVille (2003 – 2004) – fuse box diagram
Year of production: 2003, 2004
Underhood Fuse Block
The underhood fuse block is located next to the engine on the passenger’s side of the vehicle. To access the fuses, push in the two tabs located at each end of the fuse block cover. Then lift the cover off.
Fuse 22 or 23 can be moved to the outer position to enable the accessory power outlets or cigarette lighter when the ignition is not on.
| Fuses | Usage |
| 1 | Assembly Line Diagnostic Work |
| 2 | Accessory |
| 3 | Windshield Wipers |
| 4 | Not Used |
| 5 | Headlamp Low Beam Left |
| 6 | Headlamp Low Beam Right |
| 7 | Instrument Panel |
| 8 | Powertrain Control Module Battery |
| 9 | Headlamp High Beam Right |
| 10 | Headlamp High Beam Left |
| 11 | Ignition 1 |
| 12 | Fog Lamps |
| 13 | Transmission |
| 14 | Cruise Control |
| 15 | Coil Module |
| 16 | Injector Bank #2 |
| 17 | Not Used |
| 18 | Not Used |
| 19 | Powertrain Control Module Ignition |
| 20 | Oxygen Sensor |
| 21 | Injector Bank #1 |
| 22 | Cigar Lighter #2 |
| 23 | Cigar Lighter #1 |
| 24 | Daytime Running Lamps |
| 25 | Horn |
| 26 | Air Conditioner Clutch |
| 42 | Not Used |
| 43 | Not Used |
| 44 | Anti-Lock Brake System |
| 45 | Air Pump |
| 46 | Cooling Fan 1 |
| 47 | Cooling Fan 2 |
| Relays | Usage |
| 27 | Headlamp High Beam |
| 28 | Headlamp Low Beam |
| 29 | Fog Lamps |
| 30 | Daytime Running Lamps |
| 31 | Horn |
| 32 | Air Conditioner Clutch |
| 33 | Not Used |
| 34 | Accessory |
| 35 | Not Used |
| 36 | Starter 1 |
| 37 | Cooling Fan 1 |
| 38 | Ignition 1 |
| 39 | Cooling Fan Series/Parallel |
| 40 | Cooling Fan 2 |
| Circuit Breakers | Usage |
| 41 | Starter |
The spare fuses are located in numbers 48 through 52. The fuse puller is located in number 53.
Rear Underseat Fuse Block
The rear fuse block is located under the rear seat on the driver’s side. The rear seat cushion must be removed to access the rear fuse block.
| Fuses | Usage |
| 1 | Fuel Pump |
| 2 | Heater, Ventilation and Air Conditioning Battery |
| 3 | Memory Seat, Tilt and Telescoping Steering |
| 4 | RR Lumbar, Antenna |
| 5 | Driver Door Module |
| 6 | Heated Seat Left Rear |
| 7 | Power Tilt and Telescoping Steering |
| 8 | Supplemental Inflation Restraint |
| 9 | SDAR (XM™ Satellite Radio) |
| 10 | Lamps Park Right |
| 11 | Fuel Tank Ventilation Solenoid |
| 12 | Ignition 1 |
| 13 | Interior Lamp Dimmer Module |
| 14 | Sunshade |
| 15 | Navigation |
| 16 | Heated Seat Left Front |
| 17 | Interior Lamps |
| 18 | Right Rear Door Module |
| 19 | Stoplamps |
| 20 | Park/Reverse |
| 21 | Audio |
| 22 | Retained Accessory Power for Sunroof |
| 23 | Lamps, Parking Left |
| 24 | Night Vision |
| 25 | Passenger Door Module |
| 26 | Body |
| 27 | Export Lights, Power Locks |
| 28 | Rear HVAC Blower |
| 29 | Ignition Switch |
| 30 | Hazard Signal |
| 31 | Reverse, Locks |
| 32 | Continuous Variable Road Sensing Suspension |
| 33 | Heating, Ventilation, Air Conditioning |
| 34 | Ignition 3 Rear |
| 35 | Antilock Braking System |
| 36 | Heated Seat, Right Front |
| 37 | Heated Seat, Right Rear |
| 38 | Dimmer |
| 60 | Park Brake |
| 61 | Rear Defog |
| 62 | HVAC Blower |
| 63 | Audio Amplifier |
| 64 | ELC Compressor/Exhaust |
| 65 | Cigar Lighter |
| 66 | Not Used |
| Relays | Usage |
| 39 | Fuel Pump |
| 40 | Parking Lamps |
| 41 | Ignition 1 |
| 42 | Park Brake A |
| 43 | Park Brake B |
| 44 | Park Shift Interlock |
| 45 | Reverse Lamps |
| 46 | Retained Accessory Power for Sunroof |
| 47 | Reverse Lockout |
| 48 | Suspension Dampers |
| 49 | Ignition 3 |
| 50 | Fuel Tank Door Release |
| 51 | Interior Lamps |
| 52 | Trunk Release |
| 53 | Not Used |
| 54 | Lock, Cylinder |
| 55 | Automatic Level Control Compressor |
| 58 | Cigar Lighter |
| 59 | Rear Defog |
| Circuit Breakers | Usage |
| 56 | Power Seats |
| 57 | Power Windows |
WARNING: Terminal and harness assignments for individual connectors will vary depending on vehicle equipment level, model, and market.