Mercury Grand Marquis 2003 Fuse Box Info
Passenger compartment fuse box location:
The fuse box is located below and to the left of the steering wheel by the brake pedal. Remove the panel cover to access the fuses.
Engine compartment fuse box location:
Fuse Box Diagram | Layout
Passenger compartment fuse box:
| Fuse/Relay N° | Rating | Functions |
| 1 | 15A | Audio, CD changer |
| 2 | 5A | Audio |
| 3 | 7.5A | Mirrors |
| 4 | 10A | Air Bags |
| 5 | - | Not Used |
| 6 | 15A | Instrument cluster warning lamps module, Overdrive control switch, Lighting Control Module (LCM), Police vehicle option |
| 7 | 10A | Driver’s Door Module (DDM), Premium radio |
| 8 | 25A | Powertrain Control Module (PCM) power relay, Coil-on plugs, Radio noise capacitor, Passive Anti-Theft System (PATS) |
| 9 | 5A | Transmission range sensor |
| 10 | 10A | Rear window defrost, Heated mirrors |
| 11 | 5A | Traction control indicator relay (ABS w/traction control only) |
| 12 | 15A | Multi-function switch for turn/hazard lamps |
| 13 | 5A | Radio (premium only) |
| 14 | 10A | Anti-lock Brake System (ABS), Instrument Cluster |
| 15 | 15A | Speed control, Police vehicle option, LCM, Clock, EATC blower motor relay, Door lock switch illumination |
| 16 | 15A | Reversing lamps, Shift lock, DRL module, VAP Steering, Electronic day/night mirror, Overhead console, Air suspension, Climate control, Speed chime module (GCC only) |
| 17 | 7.5A | Wiper motor |
| 18 | 15A | Fog lamps (Marauder only) |
| 19 | 15A | Brake lamps |
| 20 | - | Not Used |
| 21 | 15A | LCM for park lamps and interior illumination, Autolamp/Sunload sensor |
| 22 | 20A | Speed control servo, Multi-function switch for hazard lamps, Brake on/off switch |
| 23 | 15A | EATC module, Instrument cluster, Clock, LCM, Interior lamps, Door lock switches |
| 24 | 10A | Left-hand low beam |
| 25 | 15A | Cigar lighter |
| 26 | 10A | Right-hand low beam |
| 27 | 25A | LCM for cornering lamps and high beam headlamps, Police vehicle option |
| 28 | 20A | Power windows, DDM |
| 29 | - | Not Used |
| 30 | - | Not Used |
| 31 | - | Not Used |
| 32 | - | Not used |
Engine compartment fuse box:
| Fuse/Relay N° | Rating | Functions |
| 1 | 25A | Audio |
| 2 | 20A | Power point |
| 3 | - | Not used |
| 4 | 15A | Horns |
| 5 | 20A | Fuel pump |
| 6 | - | Not used |
| 7 | - | Not used |
| 8 | 20A | Driver’s Door Module (DDM) |
| 9 | - | Not used |
| 10 | - | Not used |
| 11 | 20A | Daytime running lamps |
| 12 | - | Not used |
| 13 | - | Not used |
| 14 | - | Not used |
| 15 | - | Not used |
| 16 | - | Not Used |
| 17 | - | Not used |
| 18 | - | Not used |
| 19 | 15A | Powertrain Control Module (PCM), Fuel injectors |
| 20 | 15A | PCM, HEGOs |
| 21 | - | Not used |
| 22 | - | Not used |
| 23 | - | Not used |
| 24 | - | Not used |
| 101 | 30A | Ignition switch |
| 102 | 50A | Cooling fan (engine) |
| 103 | 40A | Blower motor |
| 104 | 40A | Heated backlight relay |
| 105 | 30A | PCM power relay |
| 106 | 40A | Anti-lock Brake System (ABS) |
| 107 | - | Not used |
| 108 | - | Not used |
| 109 | - | Not used |
| 110 | - | Not used |
| 111 | - | Not used |
| 112 | 50A | Ignition switch |
| 113 | 50A | Feeds IP fuses 3, 5, 21, 23, 25, 27 |
| 114 | 30A | VAP Steering, Air suspension compressor, Instrument cluster |
| 115 | 50A | Ignition switch |
| 116 | 30A | Wipers |
| 117 | - | Not used |
| 118 | 20A | ABS |
| 201 | - | Horn relay |
| 202 | - | PCM relay |
| 203 | - | Fuel pump relay |
| 204 | - | A/C clutch relay |
| 205 | - | Traction control relay |
| 206 | - | Police vehicle relay |
| 207 | - | Fog lamp relay (Marauder only) |
| 208 | - | Not used |
| 209 | - | Fog FTP relay (Marauder only) |
| 301 | - | Blower motor relay |
| 302 | - | Starter solenoid relay |
| 303 | - | Air suspension relay |
| 304 | - | Heated backlight relay |
| 401 | - | Not used |
| 501 | - | PCM diode |
| 502 | - | Not used |
| 503 | - | Not used |
| 601 | - | Not used |
| 602 | 20A | Adjustable pedals, Power seat, Locks, Decklid, Lumbar |
