Mercury Grand Marquis 2008 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 | 10A | Ignition (START) - Starter relay coil, DTRS |
| 2 | 7.5A | Power mirrors, Door lock switches, Mirror switch, Keypad switch, Decklid switch, Adjustable pedal switch, DDM, Cluster |
| 3 | 5A | Ignition (START) - Audio mute |
| 4 | 10A | LCM (switch illumination), Autolamp sensor |
| 5 | 7.5A | Ignition (ON/ACC) - LCM |
| 6 | 7.5A | LCM |
| 7 | 10A | Ignition (ON/ACC) - Wiper module |
| 8 | 10A | Electronic Automatic Temperature Control (EATC) module (vehicles equipped with EATC only) |
| 9 | 7.5A | Ignition (ON/ACC) - Door lock switch illumination, Heated seat switch illumination, Moon roof, Overhead console, Radio, Antenna, Electrochromatic mirror, Window relay coil |
| 10 | 15A | Hazards |
| 11 | 15A | Ignition (ON) - Turn signals |
| 12 | 15A | Audio |
| 13 | 10A | Ignition (ON) - Anti-lock Brake System (ABS) module, Rear Air Suspension Module (RASM), Variable Assist Power Steering (VAPS), Cluster |
| 14 | 15A | Adjustable pedals |
| 15 | 10A | Ignition (ON) - EATC module, A/C mode switch (vehicles equipped with manual A/C only), A/C blower relay coil |
| 16 | 20A | Cigar lighter, OBD II |
| 17 | 10A | Ignition (ON) - A/C mode switch (vehicles equipped with manual A/C), Blend door, Heated seat modules, BTSI (Floor-shift transmission) |
| 18 | 15A | Lighting control module (interior lighting) |
| 19 | 10A | LCM (Left-hand low beam) |
| 20 | 10A | Ignition (ON/START) - Back-up lamps |
| 21 | 10A | LCM (Right-hand low beam) |
| 22 | 10A | Ignition (ON/START) - Restraint Control Module (RCM), Occupant Classification Sensor (OCS), Passenger Air bag Deactivation Indicator (PADI) |
| 23 | 15A | Multi-function switch (Flash-to-pass), LCM (High beams) |
| 24 | 10A | Ignition (ON/START) - Passive Anti-Theft System (PATS) module, Powertrain Control Module (PCM) relay coil, Fuel relay coil, Ignition coil relay coil |
| 25 | 15A | LCM (Park lamps, corner lamps, license lamps) |
| 26 | 10A | Ignition (ON/START) - Cluster, LCM, Overdrive cancel switch |
| 27 | - | Not used |
| 28 | 7.5A | Brake signal, LCM (BTSI), ABS |
| 29 | - | Not used |
| 30 | - | Not used |
| 31 | 5A | Key in (LCM) |
| 32 | - | Not used |
| 33 | - | Not used |
| Relay 1 | - | Window relay |
Engine compartment fuse box:
| Fuse/Relay N° | Rating | Functions |
| 1 | 30A | Ignition switch |
| 2 | 20A | Moon roof |
| 3 | 10A | Powertrain Control Module (PCM) keep alive power, Canister vent |
| 4 | 20A | Fuel relay feed |
| 5 | 10A | Rear Air Suspension Module (RASM), VAPS |
| 6 | 15A | Alternator regulator |
| 7 | 30A | PCM relay feed |
| 8 | 20A | Driver’s Door Module (DDM) |
| 9 | 15A | Ignition coil relay feed |
| 10 | 20A | Horn relay feed |
| 11 | 15A | A/C clutch relay feed |
| 12 | 20A | Audio (Subwoofer) |
| 13 | 20A | Instrument panel power point |
| 14 | 20A | Stop lamp switch |
| 15 | 15A | Foglamps |
| 16 | 20A | Heated seats |
| 17 | - | Not used |
| 18 | - | Not used |
| 19 | 15A | Injectors |
| 20 | 15A | PCM |
| 21 | 15A | Powertrain loads and sensors |
| 22 | - | Not used |
| 23 | - | Not used |
| 24 | 10A | Heated mirror, Rear defrost indicator |
| 101 | 40A | Blower relay feed |
| 102 | 50A | Cooling fan |
| 103 | 50A | Instrument panel (I/P) fuse box feed #1 (I/P fuses 10, 12, 14, 16 and 18) |
| 104 | 50A | Instrument panel (I/P) fuse box feed #2 (I/P fuses 2, 4, 6, 8, 19, 21, 23 and 25) |
| 105 | 30A | Starter relay feed |
| 106 | 40A | Anti-lock Brake System (ABS) module (Pump) |
| 107 | 40A | Rear defroster relay feed |
| 108 | 20A | Not used |
| 109 | 20A | ABS module (Valves) |
| 110 | 30A | Wiper module |
| 111 | - | Not used |
| 112 | 30A | Air suspension compressor |
| 113 | - | Not used |
| 114 | - | Not used |
| 115 | - | Not used |
| 116 | - | Not used |
| 117 | - | Not used |
| 118 | - | Not used |
| 201 | - | A/C clutch |
| 202 | - | Not used |
| 203 | - | Ignition coil |
| 204 | - | PCM |
| 205 | - | Foglamps |
| 206 | - | Fuel |
| 207 | - | Not used |
| 208 | - | Not used |
| 209 | - | Horn |
| 301 | - | Starter |
| 302 | - | Air compressor |
| 303 | - | Blower |
| 304 | - | Rear defrost relay |
| 501 | - | A/C clutch |
| 502 | - | PCM |
| 503 | - | Not used |
| 601 | 20A | Power seats, Lumbar |
| 602 | 20A | Power windows relay feed (RUN/ACC) |
