2007 Mercury Grand Marquis Info Systems & Data Sheets
The 2007 Mercury Grand Marquis runs the 4.6L SOHC two-valve Romeo V8 on the Panther platform — 224 hp at 4,800 rpm and 272 lb-ft at 4,000 rpm on GS and standard LS trim, 235 hp on the High Performance Package (HPP) with dual exhaust and a 3.27 rear axle ratio. The 4R75W four-speed automatic is the only transmission offered, same unit as the 2005–2011 Crown Vic and Town Car. By 2007 the electronic throttle control system is in its third model year — no cable, no IAC, all drive-by-wire via three APP sensors. The Grand Marquis PCM pinout is closely related to the Crown Victoria's: C175B pin 8 is not used on the Grand Marquis (same as Crown Vic, different from Town Car where it's also not used but for a different architectural reason), and C175T pin 21 carries an engine vacuum signal on the Crown Vic but is not used on the Grand Marquis. C175B pin 14 carries an A/C clutch relay control signal (OG/LB, circuit 73) specific to the Grand Marquis and Town Car configuration. The Grand Marquis BJB uses 1/2 ISO relays at positions 201–209 and Full ISO relays at 301–304, consistent with the Crown Vic — not the Micro/Mini relay format of the Town Car. Position 205 carries the fog lamp relay, which the Crown Vic civilian LX does not have. EGR remains active on 2007 — DPFE sensor at C175E pin 21, EVR solenoid at pin 63.
Download Your Schematics:
- 2007 Mercury Grand Marquis Battery Junction Fuse Box Schematic Data Sheet
- 2007 Mercury Grand Marquis Powertrain Control Module Schematic Data Sheet
- 2007 Mercury Grand Marquis Central Junction Box Schematic Data Sheet
Resources:
- Ford OBD-2 Diagnostic Trouble Codes List
- 2003–2011 Panther Platform Resources & Manuals List
- Label Installation Guide
Labels:
In this post:
- Engine Specifications
- Transmission Specifications
- Battery Junction Box Fuse Panel Data & Info
- Powertrain Control Module Data & Info
- Central Junction Fuse Box Data & Info
- Trim Level Fuse Differences
- Known Issues & TSB Reference
- Scheduled Maintenance Intervals
Engine Specifications
The 2007 Grand Marquis runs the same 4.6L Romeo V8 block as the Crown Vic — SOHC, two valves per cylinder, 9.4:1 compression, 90.2mm bore by 90.0mm stroke. Standard output on GS and LS trim is 224 hp at 4,800 rpm and 272 lb-ft at 4,000 rpm. The High Performance Package (HPP), available on LS trim with dual exhaust and a 3.27 limited-slip rear axle, bumps output to 235 hp. The PCM calibration differs between standard and HPP configurations — if you're diagnosing an HPP car, confirm the calibration ID before assuming standard tune behavior. ETC is standard across all 2007 Grand Marquis trims; there is no cable throttle option this model year. All figures are SAE net.
| Specification | Value |
|---|---|
| Engine Family | Ford Modular V8 — Romeo cast |
| Displacement | 4.6L (4,601 cc / 280.8 cu in) |
| Configuration | V8, 90° — SOHC, 2 valves per cylinder (16 total) |
| Bore × Stroke | 90.2 mm × 90.0 mm (3.55 in × 3.54 in) |
| Compression Ratio | 9.4:1 |
| Horsepower (Standard) | 224 hp @ 4,800 rpm (SAE net) — GS, LS single exhaust |
| Horsepower (HPP) | 235 hp @ 4,800 rpm — LS High Performance Package (dual exhaust) |
| Torque | 272 lb-ft @ 4,000 rpm (SAE net) |
| Redline | ~5,550 rpm |
| Fuel Type | Unleaded — 87 octane minimum (regular) |
| Fuel Injection | Sequential Multi-Port Fuel Injection (SEFI) |
| Throttle Control | Electronic (Drive-By-Wire / ETC) — standard since 2005 |
| Ignition | Coil-on-plug (COP) — 8 individual coils, no distributor |
| Engine Oil Capacity | 6 quarts with filter change |
| Engine Oil Spec | SAE 5W-20 (Motorcraft) |
| Coolant Capacity | ~17.9 liters (18.9 qts / 4.7 gal) |
| Coolant Spec | Motorcraft Premium Gold (yellow) — do not mix with green |
| Fuel Tank Capacity | 19 gallons |
Transmission Specifications
The 2007 Grand Marquis uses the 4R75W — introduced across the Panther platform in 2005 alongside ETC. The 4R75W added a turbine shaft speed (TSS) sensor over the earlier 4R70W, giving the PCM real-time torque converter slip data at C175T pin 15, along with a stronger 24-lug ring gear and revised front pump. Gear ratios are unchanged from the 4R70W. Fluid spec is Mercon V — do not substitute Mercon or Dexron, both damage the friction clutches. HPP cars came with the 3.27 limited-slip axle; standard trim cars use the 2.73. The 3.55 limited-slip was not offered on the Grand Marquis in 2007.
| Specification | Value |
|---|---|
| Transmission Model | Ford 4R75W 4-speed automatic |
| Type | Rear-wheel drive, 4-speed automatic with overdrive |
| 1st Gear Ratio | 2.84:1 |
| 2nd Gear Ratio | 1.55:1 |
| 3rd Gear Ratio | 1.00:1 |
| 4th Gear Ratio (OD) | 0.70:1 |
| Reverse Ratio | 2.32:1 |
| Torque Capacity | ~700 Nm |
| Turbine Speed Sensor | Yes — TSS (C175T pin 15) feeds PCM for TC slip monitoring |
| Fluid Type | Mercon V ATF — do not substitute Mercon or Dexron |
| Fluid Capacity | ~13.9 quarts (total system, dry fill) |
| Dipstick | May be absent on sealed units — check via fill plug on lift |
| Axle Ratio Options | 2.73:1 (standard) / 3.27:1 limited slip (HPP) |
| Rear Axle | Ford 8.8 inch — Traction-Lok (limited slip) on HPP |
| Rear Axle Fluid | 75W-140 synthetic (limited slip) or 80W-90 (standard) |
| Rear Axle Fluid Note | Add 4 oz. Motorcraft XL-3 friction modifier for Traction-Lok |
Battery Junction Box Fuse Panel Data & Info
Location: Engine bay, passenger side, behind battery | All information verified with AllData.
The Battery Junction Box (BJB) on the 2007 Grand Marquis is the under-hood high-current distribution center — first stop after the battery and alternator for the heavy loads: starter relay, cooling fan (50A), ABS pump (40A), blower relay, rear defroster relay, PCM power relay, and the two main maxi-fuse feeds (BJB 103 and 104) that power the interior CJB. The Grand Marquis BJB layout for 2007 is closer to the civilian Crown Vic than to the Town Car — same 1/2 ISO relay format at positions 201–209 and Full ISO at 301–304, no police-specific PDB feeds, no rear power points. The key differences from the civilian Crown Vic: position 15 carries a 15A fog lamp feed (the Crown Vic civilian LX doesn't have this), position 205 is the fog lamp relay, position 8 adds door locks to the DDM feed for 2007–2008, and positions 111–118 are unpopulated (unlike the P71 Crown Vic). The PCM power chain runs through BJB fuses 3 (10A keep-alive and canister vent), 7 (30A PCM relay feed), and 20 (15A PCM). Voltage drop on any of these feeds under load can produce intermittent PCM communication faults or misfire codes with no clean root cause — always test the feed chain before replacing sensors or the module.
The same moisture and heat failure loop that affects all Panther BJBs applies here. Water path on the Grand Marquis is typically through the BJB cover seal or cowl drainage — once moisture is on the bus bars or fuse legs, corrosion raises resistance, resistance generates heat, and heat produces the classic symptoms: intermittent no-crank, repeated blown maxi fuses, multiple unrelated systems failing together, or charging complaints that don't trace to the alternator. Correct fix: eliminate the water source and seal the box, then physically inspect every fuse and relay position for heat discoloration or corrosion. If bus contacts show green or white buildup, clean is not good enough — replace the affected terminals. Confirm with a voltage-drop test across the main feeds and grounds under load after any repair.
| # | AMP | FUNCTION |
|---|---|---|
| 1 | 30A | Ignition switch |
| 2 | 20A | Moon roof (2007–2008); Not used (2009–2011) |
| 3 | 10A | Powertrain Control Module (PCM) keep alive power, Canister vent |
| 4 | 20A | Fuel relay feed |
| 5 | 10A | Rear Air Suspension Module (RASM), VAPS module (2007–2008) |
| 6 | 15A | Alternator regulator |
| 7 | 30A | PCM relay feed |
| 8 | 20A | Driver's Door Module (DDM), Door locks (2007–2008) |
| 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 | Fog lamps |
| 16 | 20A | Heated seats |
| 17 | — | Not used |
| 18 | — | Not used |
| 19 | 15A | Powertrain Control Module (PCM), Fuel injectors |
| 20 | 15A | PCM |
| 21 | 15A | Powertrain loads and sensors |
| 22 | — | Not used |
| 23 | — | Not used |
| 24 | 10A | Heated mirrors, 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 (2007–2008); Cigar lighter (2009–2011) |
| 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 | 1/2 ISO | A/C clutch relay |
| 202 | — | Not used |
| 203 | 1/2 ISO | Ignition coil relay |
| 204 | 1/2 ISO | PCM relay |
| 205 | 1/2 ISO | Fog lamps relay |
| 206 | 1/2 ISO | Fuel relay |
| 207 | — | Not used |
| 208 | — | Not used |
| 209 | 1/2 ISO | Horn relay |
| 301 | Full ISO | Starter relay |
| 302 | Full ISO | Air compressor relay (air suspension) |
| 303 | Full ISO | Blower relay |
| 304 | Full ISO | Rear defrost relay |
| 401 | — | Not used |
| 501 | Diode | A/C clutch (2007–2008); Not used (2009–2011) |
| 502 | Diode | PCM |
| 503 | Diode | Horn, Door latch (2007); Not used (2008–2011) |
| 601 | 20A Circuit Breaker | Power seats, Lumbar, Deck lid |
| 602 | 20A Circuit Breaker | Power windows relay feed (RUN/ACC) |
Legend
- # — Terminal Position
- ABS — Anti-lock Brake System
- ACC — Accessory
- AMP — Terminal Amperage
- DDM — Driver's Door Module
- EATC — Electronic Automatic Temperature Control
- FUNCTION — Circuit Function
- I/P — Instrument Panel
- ISO — International Standards Organization
- LCM — Lighting Control Module
- PCM — Powertrain Control Module
- RASM — Rear Air Suspension Module
- VAPS — Variable Assist Power Steering
Powertrain Control Module (PCM/ECU) Data & Info
Location: Engine bay, driver's side inner fender | All information verified with AllData.
The 2007 Grand Marquis PCM shares the same three-connector 150-pin layout as all 2005–2011 Crown Victoria and Grand Marquis units — C175T (left, black, part 12B637), C175B (center, black, part 14290), C175E (right, black, part 12B637). C175T handles the transmission side: DTR sensor signals (TR1/TR2/TR3A/TR4 at pins 16, 17, 27, 28), TSS at pin 15, EPC solenoid at pin 11, shift solenoids A and B at pins 42 and 43, TCC solenoid at pin 46, and both upstream HO2S inputs and heater controls. C175B manages engine control and communications: the three APP signals at pins 5, 17, and 28, ETC reference voltages at pins 4 and 24, HS CAN bus at pins 11 and 23, starter relay control at pin 2, fuel pump monitor and modulated pump signal at pins 21 and 12, and the ground cluster at pins 47–50 (BK/WH, circuit 570, 18 ga). C175E carries all eight coil-on-plug outputs, all eight injector controls, downstream O2 sensors, MAF, IAT, CHT, crank and cam position sensors, knock sensors, MAP, DPFE, and both ETC motor drive signals at pins 34 and 51. Notable Grand Marquis-specific pin: C175B pin 14 carries A/C clutch relay control (OG/LB, circuit 73) — this is present on the Grand Marquis and Town Car but not in the Crown Vic pinout.
C175B pin 8 is not used on the Grand Marquis — the same as the Crown Vic. This is the pin that generates confusion when people use a mixed Panther pinout: on neither the Crown Vic nor the Grand Marquis is this pin populated, but the Town Car uses it differently as well. Always confirm the model before using a generic Panther pinout for diagnosis. C175T pin 21 is not used on the Grand Marquis (the Crown Vic uses it for an engine vacuum signal — confirm model before pulling that pin). The EGR system is active on 2007 Grand Marquis across all trims — DPFE at C175E pin 21, EVR solenoid at pin 63. HPP cars with dual exhaust run the same PCM connector layout but with a different calibration; if scan data behavior seems off on an HPP car, confirm you're comparing against HPP tune specs, not the single-exhaust baseline.
The C175B ground cluster at pins 47–50 is the first diagnostic stop on any 2007 Grand Marquis with hard-to-attribute electrical symptoms. All four pins ground at the same node via BK/WH, circuit 570, 18 ga — if any of those pins develop resistance from corrosion, the symptoms come out as cross-system sensor anomalies, intermittent misfires without a clean cylinder pattern, or transmission shift complaints that scan data can't explain. Voltage-drop test each pin to battery negative with the engine running — above 0.1V means the ground cluster is compromised. Also verify C175B pins 35 and 36 (RD, circuit 361, switched run/start voltage) and pin 45 (RD/WH, circuit 729, constant battery feed) under load before any PCM-level diagnosis. The 2007 PCM is VIN-programmed and requires reflash after replacement.
C175T (BK) | LEFT (12B637)
| PIN | COLOR | CIRCUIT | GAUGE | FUNCTION |
|---|---|---|---|---|
| 1 | — | — | — | Not used |
| 2 | — | — | — | Not used |
| 3 | DB/YE | 136 | 20 | Output shaft speed (OSS) sensor signal |
| 4 | — | — | — | Not used |
| 5 | — | — | — | Not used |
| 6 | — | — | — | Not used |
| 7 | — | — | — | Not used |
| 8 | — | — | — | Not used |
| 9 | — | — | — | Not used |
| 10 | — | — | — | Not used |
| 11 | WH/YE | 925 | 20 | Electronic Pressure Control (EPC) solenoid |
| 12 | — | — | — | Not used |
| 13 | — | — | — | Not used |
| 14 | — | — | — | Not used |
| 15 | DG/WH | 970 | 20 | Turbine shaft speed (TSS) sensor signal |
| 16 | YE/BK | 1144 | 20 | Digital Transmission Range (DTR) sensor — TR1 |
| 17 | LB/BK | 1145 | 20 | Digital Transmission Range (DTR) sensor — TR2 |
| 18 | — | — | — | Not used |
| 19 | — | — | — | Not used |
| 20 | — | — | — | Not used |
| 21 | — | — | — | Not used |
| 22 | — | — | — | Not used |
| 23 | — | — | — | Not used |
| 24 | RD/LG | 392 | 18 | Heated oxygen sensor (HO2S) #12 input |
| 25 | VT/LG | 393 | 18 | Heated oxygen sensor (HO2S) #22 input |
| 26 | — | — | — | Not used |
| 27 | RD/BK | 1268 | 20 | Digital Transmission Range (DTR) sensor — TR3A |
| 28 | WH/BK | 1143 | 20 | Digital Transmission Range (DTR) sensor — TR4 |
| 29 | OG/BK | 923 | 20 | Transmission Fluid Temperature (TFT) sensor |
| 30 | — | — | — | Not used |
| 31 | — | — | — | Not used |
| 32 | OG/RD | 1269 | 20 | Anti-theft indicator control |
| 33 | — | — | — | Not used |
| 34 | — | — | — | Not used |
| 35 | — | — | — | Not used |
| 36 | — | — | — | Not used |
| 37 | — | — | — | Not used |
| 38 | — | — | — | Not used |
| 39 | — | — | — | Not used |
| 40 | — | — | — | Not used |
| 41 | GY/RD | 359 | 20 | Signal return |
| 42 | OG/YE | 237 | 20 | Shift solenoid A |
| 43 | VT/OG | 315 | 20 | Shift solenoid B |
| 44 | — | — | — | Not used |
| 45 | — | — | — | Not used |
| 46 | VT/YE | 126 | 20 | Torque Converter Clutch (TCC) solenoid |
| 47 | WH/BK | 389 | 18 | Heated oxygen sensor (HO2S) #12 heater |
| 48 | TN/YE | 390 | 18 | Heated oxygen sensor (HO2S) #22 heater |
| 49 | — | — | — | Not used |
| 50 | — | — | — | Not used |
C175B (BK) | CENTER (14290)
| PIN | COLOR | CIRCUIT | GAUGE | FUNCTION |
|---|---|---|---|---|
| 1 | GY/BK | 679 | 20 | Vehicle speed signal |
| 2 | BK | 3405 | 20 | Starter relay control |
| 3 | RD/PK | 791 | 20 | Fuel tank pressure transducer sensor signal |
| 4 | WH/LB | 3093 | 20 | Electronic Throttle Control (ETC), Vref 1 |
| 5 | TN/YE | 1283 | 20 | Accelerator pedal position (APP) sensor 1 signal |
| 6 | TN/WH | 1284 | 20 | Electronic Throttle Control (ETC) signal return |
| 7 | — | — | — | Not used |
| 8 | — | — | — | Not used |
| 9 | OG | 636 | 20 | Deactivator switch signal |
| 10 | BK | 57 | 18 | Ground |
| 11 | WH/LG | 1827 | 20 | HS CAN bus+ |
| 12 | LB/OG | 926 | 20 | Modulated fuel pump signal |
| 13 | VT/WH | 91 | 20 | Evap canister vent control solenoid control |
| 14 | OG/LB | 73 | 20 | A/C clutch relay control |
| 15 | PK/LB | 883 | 20 | A/C cycling switch signal |
| 16 | — | — | — | Not used |
| 17 | WH | 3012 | 20 | Accelerator pedal position (APP) sensor 2 signal |
| 18 | — | — | — | Not used |
| 19 | LB/BK | 151 | 20 | Speed control switch reference voltage |
| 20 | YE/BK | 1799 | 20 | RDI / VEMS signal |
| 21 | DG/YE | 238 | 20 | Fuel pump monitor |
| 22 | — | — | — | Not used |
| 23 | PK/LG | 1828 | 20 | HS CAN bus− |
| 24 | LB/BK | 3091 | 20 | Electronic Throttle Control (ETC), Vref 2 |
| 25 | — | — | — | Not used |
| 26 | WH/BK | 1154 | 20 | A/C pressure transducer sensor signal |
| 27 | — | — | — | Not used |
| 28 | WH/RD | 3015 | 20 | Accelerator pedal position (APP) sensor 3 signal |
| 29 | TN/WH | 224 | 20 | Transmission control switch signal |
| 30 | DG/OG | 848 | 20 | Speed control switch, signal return |
| 31 | WH/LG | 1215 | 20 | TX signal |
| 32 | YE/LB | 1816 | 20 | Generator communication |
| 33 | — | — | — | Not used |
| 34 | YE/LG | 330 | 20 | Power steering pressure switch signal |
| 35 | RD | 361 | 20 | Voltage supplied in start and run (overload protected) |
| 36 | RD | 361 | 20 | Voltage supplied in start and run (overload protected) |
| 37 | — | — | — | Not used |
| 38 | — | — | — | Not used |
| 39 | — | — | — | Not used |
| 40 | BR/WH | 351 | 20 | Reference voltage |
| 41 | GY/RD | 359 | 20 | Signal return |
| 42 | GY/OG | 1216 | 20 | RX signal |
| 43 | — | — | — | Not used |
| 44 | VT | 107 | 20 | Flash / EEPROM power supply |
| 45 | RD/WH | 729 | 20 | Voltage supplied at all times (overload protected) |
| 46 | — | — | — | Not used |
| 47 | BK/WH | 570 | 18 | Ground |
| 48 | BK/WH | 570 | 18 | Ground |
| 49 | BK/WH | 570 | 18 | Ground |
| 50 | BK/WH | 570 | 18 | Ground |
C175E (BK) | RIGHT (12B637)
| PIN | COLOR | CIRCUIT | GAUGE | FUNCTION |
|---|---|---|---|---|
| 1 | — | — | — | Not used |
| 2 | — | — | — | Not used |
| 3 | WH/OG | 369 | 20 | Heated PTC control |
| 4 | — | — | — | Not used |
| 5 | YE | 1817 | 20 | Generator monitor control |
| 6 | LG/BK | 191 | 20 | EVAP canister purge control |
| 7 | RD/OG | 229 | 20 | Engine cooling fan motor control |
| 8 | — | — | — | Not used |
| 9 | WH/RD | 1029 | 20 | Coil-on-plug (COP) 8 control |
| 10 | LG/YE | 1021 | 20 | Coil-on-plug (COP) 5 control |
| 11 | PK/WH | 1026 | 20 | Coil-on-plug (COP) 2 control |
| 12 | WH/PK | 1028 | 20 | Coil-on-plug (COP) 3 control |
| 13 | — | — | — | Not used |
| 14 | DG/VT | 1030 | 20 | Coil-on-plug (COP) 4 control |
| 15 | OG/YE | 1025 | 20 | Coil-on-plug (COP) 6 control |
| 16 | PK/LB | 1027 | 20 | Coil-on-plug (COP) 7 control |
| 17 | LG/WH | 1024 | 20 | Coil-on-plug (COP) 1 control |
| 18 | — | — | — | Not used |
| 19 | LB | 1164 | 20 | Fuel rail temperature sensor signal |
| 20 | — | — | — | Not used |
| 21 | BR/LG | 352 | 20 | Differential Pressure Feedback EGR (DPFE) sensor input |
| 22 | GY | 743 | 20 | Intake Air Temperature (IAT) sensor signal |
| 23 | — | — | — | Not used |
| 24 | — | — | — | Not used |
| 25 | LB/RD | 967 | 20 | Mass Air Flow (MAF) sensor signal |
| 26 | TN/LB | 968 | 20 | Mass Air Flow (MAF) sensor signal |
| 27 | — | — | — | Not used |
| 28 | GY/LB | 74 | 18 | Heated oxygen sensor (HO2S) #11 input |
| 29 | RD/BK | 94 | 18 | Heated oxygen sensor (HO2S) #21 input |
| 30 | — | — | — | Not used |
| 31 | — | — | — | Not used |
| 32 | RD/PK | 141 | 20 | Fuel rail pressure sensor signal |
| 33 | — | — | — | Not used |
| 34 | DB/YE | 1835 | 20 | Electronic Throttle Control (ETC) motor +/− |
| 35 | WH | 556 | 20 | Fuel injector 2 control |
| 36 | BR/LB | 558 | 20 | Fuel injector 4 control |
| 37 | LG/OG | 560 | 20 | Fuel injector 6 control |
| 38 | LB | 562 | 20 | Fuel injector 8 control |
| 39 | — | — | — | Not used |
| 40 | — | — | — | Not used |
| 41 | YE/LG | 1102 | 20 | Cylinder head temperature (CHT) sensor signal |
| 42 | — | — | — | Not used |
| 43 | — | — | — | Not used |
| 44 | — | — | — | Not used |
| 45 | DB/OG | 282 | 20 | Camshaft position sensor signal |
| 46 | GY/YE | 139 | 20 | Crankshaft position sensor − |
| 47 | BK/PK | 138 | 20 | Crankshaft position sensor + |
| 48 | YE | 1273 | 20 | Knock sensor − |
| 49 | YE/RD | 310 | 20 | Knock sensor + |
| 50 | — | — | — | Not used |
| 51 | OG/YE | 1836 | 20 | Electronic Throttle Control (ETC) motor +/− |
| 52 | TN | 555 | 20 | Fuel injector 1 control |
| 53 | BR/YE | 557 | 20 | Fuel injector 3 control |
| 54 | TN/BK | 559 | 20 | Fuel injector 5 control |
| 55 | TN/RD | 561 | 20 | Fuel injector 7 control |
| 56 | — | — | — | Not used |
| 57 | BR/WH | 351 | 20 | Reference voltage |
| 58 | GY/RD | 359 | 20 | Signal return |
| 59 | PK/OG | 1858 | 20 | Electronic Throttle Control (ETC) module signal return |
| 60 | YE/WH | 357 | 20 | Throttle Position Sensor (TPS) signal 2 |
| 61 | GY/WH | 355 | 20 | Throttle Position Sensor (TPS) signal 1 |
| 62 | LB/RD | 3067 | 20 | Manifold Absolute Pressure (MAP) sensor input |
| 63 | BR/PK | 360 | 20 | EGR Vacuum Regulator (EVR) signal |
| 64 | — | — | — | Not used |
| 65 | — | — | — | Not used |
| 66 | YE/WH | 1857 | 20 | Electronic Throttle Control (ETC) module reference voltage |
| 67 | — | — | — | Not used |
| 68 | — | — | — | Not used |
| 69 | RD/WH | 387 | 18 | Heated oxygen sensor (HO2S) #11 heater |
| 70 | YE/LB | 388 | 18 | Heated oxygen sensor (HO2S) #21 heater |
Wire Color Legend
- BK — Black
- BR — Brown
- DB — Dark Blue
- DG — Dark Green
- GY — Gray
- LB — Light Blue
- LG — Light Green
- OG — Orange
- PK — Pink
- RD — Red
- TN — Tan
- VT — Violet
- WH — White
- YE — Yellow
Central Junction Fuse Box Data & Info
Location: Driver's side compartment, under steering wheel | All information verified with AllData.
The Central Junction Box (CJB) on the 2007 Grand Marquis is the interior distribution panel — the cabin-side counterpart to the under-hood BJB. It carries switched and unswitched feeds to the lighting control module, HVAC, wiper motor, audio, door modules, PATS transceiver, restraints module, brake shift interlock, and more. Its two primary feeds come from BJB positions 103 and 104 — a dead or high-resistance BJB maxi fuse can take out entire CJB sections with no obvious blown fuse inside. The Grand Marquis CJB layout for 2007 differs from the Crown Vic in several positions: position 1 adds a starter relay coil to the DTR sensor feed, position 2 includes the moonroof (2007–2008), adjustable pedal switch, and decklid switch, position 13 adds VAPS to the RASM and ABS feed (2007–2008), position 20 picks up back-up lamps and ABS (2009–2011), and positions 25 and 31 differ in lighting circuit assignments. The Grand Marquis does not have the Crown Vic's police-specific positions 29, 30, and 32. Position 33 is a 10A feed for the Fire Suppression System Module (FSSM) if equipped — a fleet/taxi option not on the Crown Vic civilian CJB.
Water intrusion is the primary CJB failure mode — same root cause as on all Panthers. On the Grand Marquis the typical entry points are the cowl drain and windshield seal; moisture migrates down the firewall and into the driver's footwell area. Once it reaches the CJB connectors, terminal corrosion and heat buildup follow the same pattern: multiple unrelated circuits failing, intermittent no-start from PATS or ignition logic faults, wiper or lighting behavior that doesn't follow switch input, or repeated fuse failures at the same position. Fix the leak first — cowl drains, windshield seal, firewall grommets — then inspect the CJB connectors for corrosion, heat discoloration, or deformed housing. Corroded terminals need to be replaced, not cleaned, on a car that's seen any amount of water intrusion.
| # | AMP | FUNCTION |
|---|---|---|
| 1 | 10A | Ignition (START) — Starter relay coil, Digital Transmission Range (DTR) sensor |
| 2 | 7.5A | Power mirrors, Door lock switches (2007–2008), Mirror switch, Keypad switch, Decklid switch, Adjustable pedal switch, Driver's Door Module (DDM), Cluster |
| 3 | 5A | Audio Control Module (ACM) |
| 4 | 10A | Autolamp sensor, Lighting Control Module (LCM) |
| 5 | 7.5A | Lighting Control Module (LCM) |
| 6 | 7.5A | Lighting Control Module (LCM) |
| 7 | 10A | Windshield wiper motor |
| 8 | 10A | Electronic Automatic Temperature Control (EATC) module (if equipped) |
| 9 | 7.5A | Ignition (ON/ACC) — Door lock switch illumination, Heated seat switch illumination, Moon roof (2007–2008), Overhead console, Radio, Antenna, Electrochromatic mirror, Window relay coil |
| 10 | 15A | Multi-function switch — Hazard lamps |
| 11 | 15A | Multi-function switch — Turn signal lamps |
| 12 | 15A | Audio Control Module (ACM) |
| 13 | 10A | Ignition (ON) — Anti-lock Brake System (ABS) module (2007–2008), Rear Air Suspension Module (RASM), Variable Assist Power Steering (VAPS) (2007–2008), Cluster |
| 14 | 15A | Taxi roof lamp switch, Adjustable pedal switch |
| 15 | 10A | Climate control assembly, HVAC module, EATC, Blower motor relay |
| 16 | 20A | Cigar lighter, OBD II (2007–2008); OBD II only (2009–2011) |
| 17 | 10A | Temperature blend door actuator, Climate control assembly, Heated seat module driver side front, Heated seat module passenger side front, Brake shift interlock |
| 18 | 15A | Lighting Control Module (LCM) — Interior lighting |
| 19 | 10A | Lighting Control Module (LCM) — Left-hand low beam |
| 20 | 10A | Digital Transmission Range (DTR) sensor, Back-up lamps, Anti-lock Brake System (ABS) (2009–2011) |
| 21 | 10A | Lighting Control Module (LCM) — Right-hand low beam |
| 22 | 10A | Passenger Airbag Deactivation (PAD) indicator, Restraints Control Module (RCM), Occupant Classification System Module (OCSM) |
| 23 | 15A | Multi-function switch (flash to pass), Lighting Control Module (LCM) — High beams |
| 24 | 10A | Ignition (ON/ACC) — Passive Anti-Theft System (PATS) module, PCM relay coil, Fuel relay coil, Ignition coil relay coil |
| 25 | 15A | Lighting Control Module (LCM) — Park lamps, corner lamps, license lamps |
| 26 | 10A | Ignition (ON/START) — Cluster, Lighting Control Module (LCM), Overdrive cancel switch, Traction control switch (2009–2011) |
| 27 | — | Not used |
| 28 | 7.5A | Lighting Control Module (LCM), Brake shift interlock, Anti-lock Brake System (ABS) module |
| 29 | — | Not used |
| 30 | — | Not used |
| 31 | 15A | Lighting Control Module (LCM) — Key in |
| 32 | — | Not used |
| 33 | 10A | Fire Suppression System Module (FSSM), Fire suppression manual switch (if equipped) |
| R | RELAY | Accessory delay relay |
Legend
- # — Terminal Position
- ABS — Anti-lock Brake System
- ACC — Accessory
- AMP — Terminal Amperage
- DDM — Driver's Door Module
- DRL — Daytime Running Lamps
- DTR — Digital Transmission Range
- EATC — Electronic Automatic Temperature Control
- FSSM — Fire Suppression System Module
- FUNCTION — Circuit Function
- LCM — Lighting Control Module
- MFS — Multi-Function Switch
- OBD — On-Board Diagnostics
- OCSM — Occupant Classification System Module
- PAD — Passenger Airbag Deactivation
- PATS — Passive Anti-Theft System
- PCM — Powertrain Control Module
- R — Relay
- RASM — Rear Air Suspension Module
- RCM — Restraints Control Module
- VAPS — Variable Assist Power Steering
Trim Level Fuse Differences
The 2007 Mercury Grand Marquis was offered in four trim configurations: GS, GS Convenience, LS Premium, and LS Ultimate. The GS is the base trim with fewer comfort features. The GS Convenience adds heated mirrors, keypad entry, and select convenience features. The LS Premium adds heated seats, moonroof, and upgraded audio. The LS Ultimate adds the HPP (dual exhaust, 3.27 axle) along with the full comfort feature set. Several fuse and relay positions are populated based on equipped features — if the layout doesn't match the diagram, confirm trim and installed options first.
| Position | GS / GS Convenience | LS Premium / LS Ultimate |
|---|---|---|
| BJB #2 | Not used (no moonroof) | 20A — Moon roof (2007–2008) |
| BJB #15 | Not used (no fog lamps on GS base) | 15A — Fog lamps (GS Convenience and LS trims) |
| BJB #16 | Not populated (no heated seats on base GS) | 20A — Heated seats (GS Convenience and above) |
| BJB #205 | Not used (no fog lamps on GS base) | 1/2 ISO relay — Fog lamps relay (GS Convenience and LS trims) |
| CJB #2 | 7.5A — Power mirrors, Door lock switches, DDM, Cluster | 7.5A — Power mirrors, Door lock switches (2007–2008), Mirror switch, Keypad, Decklid switch, Adjustable pedal switch, DDM, Cluster |
| CJB #8 | 10A — EATC module (if equipped) | 10A — EATC module (LS trims standard) |
| CJB #9 | 7.5A — Door lock sw illumination, Overhead console, Radio, Antenna, Electrochromatic mirror, Window relay coil | 7.5A — Adds heated seat switch illumination, Moon roof (2007–2008) |
| CJB #17 | Not populated (no heated seats on base GS) | 10A — Heated seat modules driver and passenger front, Blend door actuator, HVAC, Brake shift interlock |
Known Issues & TSB Reference
The items below are documented issues Ford and Mercury acknowledged for the 2007 Grand Marquis — through Technical Service Bulletins (TSBs), extended warranty coverage, or established platform-wide pattern failures. Full TSB text is available through ALLDATA, Mitchell1, or your local Ford/Mercury dealer's service department.
TSB 07-15-6 — ETC Throttle Concern / Reduced Power Mode
Some 2007 Grand Marquis vehicles may exhibit reduced power or no-throttle-response traced to the electronic throttle control system. Symptoms include a wrench indicator on the dash and P2135 or related ETC fault codes. Verify APP sensor voltages at C175B pins 5, 17, and 28 individually — all three must track together through pedal travel. Root cause is typically contamination at the APP sensor assembly or throttle body connector. HPP vehicles should have the PCM calibration ID confirmed before any ETC reflash is attempted.
TSB 07-5-5 — Exhaust Manifold Crack / Exhaust Tick
Some 2003–2009 Grand Marquis vehicles may exhibit an exhaust tick or rattle most noticeable at cold start. Cause is cracking at the exhaust manifold runners from thermal cycling — a known fatigue failure on the Romeo 4.6L two-valve. Inspect with the engine cold; cracks may be hairline but audible. Driver's side is more commonly affected. Replacement manifolds are the correct fix. Note: HPP vehicles with dual exhaust have two manifolds — inspect both. Do not attempt to weld cracked cast iron manifolds.
TSB 06-21-6 — Rear Air Suspension Compressor Failure / Excessive Cycling
Applies to 2003–2007 Grand Marquis equipped with rear air suspension. The compressor (fed at BJB fuse 112, 30A) can fail from moisture intrusion or continuous operation caused by a leaking air spring or fitting. A failed compressor will draw high current and can blow BJB 112 repeatedly. Disconnect the compressor motor and test current draw separately from the solenoid valve before ordering a compressor. Confirm the air spring is not leaking first — a compressor that's been running against a leak will need replacement regardless.Reference: TSB 06-21-6 — Rear Air Suspension, 2003–2007 Panther platform
Known Issue — Lighting Control Module (LCM) Solder Joint Failure
Affects 2003–2007 Grand Marquis (and Crown Victoria, Town Car). The LCM relay develops a cracked solder joint on the circuit board, causing intermittent or total failure of headlamps, taillamps, or other LCM-controlled circuits. Multiple CJB positions route through the LCM (fuses 4, 5, 6, 18, 19, 21, 23, 25, 28, 31), so an LCM fault can look like multiple unrelated lighting failures. The LCM is behind the driver's kick panel. Inspect the relay solder joint before replacing the module — a proper re-solder is the correct fix if the board is otherwise intact.
Known Issue — Ignition Switch Heat Damage / Intermittent No-Start
The ignition switch on 2003–2011 Panthers is powered by BJB fuse 1 (30A). Internal contact degradation in the electrical portion of the switch produces intermittent no-crank, momentary power loss to multiple Run-position circuits, or power drop during key release from Start. Inspect the switch electrical connector for heat discoloration or melted housing before ordering a switch — a high-resistance connector feeding the switch produces identical symptoms and is the cheaper fix.
Scheduled Maintenance Intervals
The intervals below reflect Ford's Normal Schedule for the 2007 Mercury Grand Marquis. Normal schedule applies to typical everyday driving. Vehicles used for taxi, fleet, or livery service — which covers a meaningful portion of surviving Grand Marquis cars — are Special Operating Conditions and require shorter intervals, particularly on engine oil, transmission fluid, and brake inspection. HPP vehicles with the 3.27 limited-slip axle require friction modifier at every rear axle fluid service.
| Service Item | Normal Interval | Notes |
|---|---|---|
| Engine Oil & Filter | Every 5,000 miles or 6 months | SAE 5W-20 — 6 qts with filter. Taxi / fleet: every 3,000 mi or 3 months |
| Tire Rotation | Every 5,000 miles | Inspect for wear at each rotation |
| Engine Air Filter | Every 30,000 miles | Replace sooner in dusty conditions |
| Fuel Filter | Every 30,000 miles | Taxi / heavy use: every 15,000 miles |
| Spark Plugs | Every 100,000 miles | Motorcraft SP-413 — gapped at 0.054 in. Do not reuse if coil boots are cracked |
| PCV Valve | Every 100,000 miles | Replace at same interval as plugs |
| Serpentine Drive Belt | Inspect at 100,000 miles | Motorcraft JK6-926 — replace if cracked, glazed, or fraying. Check tensioner and idler at same time |
| Engine Coolant | First change at 6 years or 100,000 miles | Motorcraft Premium Gold (yellow) — then every 3 years / 50,000 miles after. Do not mix with green coolant |
| Automatic Transmission Fluid | Inspect at 15,000 mi intervals — change at 150,000 miles | Mercon V only — do not substitute. Taxi / heavy use: every 30,000 miles |
| Brake Fluid | As needed / inspect annually | DOT 3 — replace if dark or boiling point has degraded from moisture absorption |
| Brake System Inspection | Every 15,000 miles | Pads, rotors, lines, hoses, and parking brake. Taxi / fleet: every 5,000 miles |
| Rear Axle Lubricant | Inspect — synthetic fill considered "for life" under normal use | Taxi / fleet: replace every 100,000 miles. HPP Traction-Lok: add 4 oz. Motorcraft XL-3 friction modifier at each service |
| Power Steering Fluid | Check at every oil change | Mercon ATF — check condition and level. ~2 pint capacity |
| Cooling System Hoses | Inspect at every major service | Replace heater hose assembly at first sign of seeping — Motorcraft KH428 |
Other Mercury Grand Marquis Years
Other Panther Platform Models
Data Disclaimer & Limitation of Liability
Read before using any data published on this site
Informational use only. All fuse assignments, relay positions, wire color codes, pin assignments, circuit numbers, connector identifiers, engine specifications, transmission specifications, torque values, maintenance intervals, and technical service bulletin references published on this site are provided for informational and reference purposes only. This data is not a substitute for a factory Ford, Lincoln, or Mercury service manual, an ALLDATA or Mitchell1 subscription, or the judgment of a qualified, licensed automotive technician.
No warranty. Data provided as-is. Riot Mind Studios, LLC makes no representations or warranties of any kind — express, implied, or statutory — regarding the completeness, accuracy, currency, or fitness for a particular purpose of any data published on this site. All information is provided strictly on an "as-is" and "as-available" basis. We do not warrant that any data point is free from error, omission, or misprint. We do not warrant that this data reflects the current production configuration of any specific vehicle.
Vehicle condition and prior modifications. The Panther Platform vehicles covered by this database (2003–2011 Ford Crown Victoria, Lincoln Town Car, Mercury Grand Marquis, and Mercury Marauder) are aging vehicles with decades of potential service history. Individual vehicles may have been subject to dealer modifications, police upfitter conversions, aftermarket electrical work, wiring repairs, fuse upgrades, or component substitutions that are not reflected in factory documentation or in the data published here. You are responsible for verifying all data against the actual condition of your specific vehicle before performing any repair, diagnostic test, or electrical work.
Model year and trim variation. Fuse assignments, relay types, PCM pin functions, and circuit configurations vary across model years, between trim levels (LX, P71/Police Interceptor, Executive, Signature, GS, LS, HPP, etc.), and in some cases between build dates within the same model year. Data that is accurate for one configuration may be incorrect or inapplicable for another. Always cross-reference this database against a source that is specific to your vehicle's model year, trim level, and build date.
Limitation of liability. To the fullest extent permitted by applicable law, Riot Mind Studios, LLC, its owner, affiliates, and any contributors shall not be liable for any direct, indirect, incidental, special, consequential, or punitive damages arising out of or related to your use of, or inability to use, any data, specification, schematic reference, or other content published on this site. This includes, without limitation: personal injury; vehicle damage; electrical damage; fire; failed emissions or safety inspections; failed diagnostic procedures; incorrect repairs; financial loss; towing costs; or damage to tools or property. Your use of this data is entirely at your own risk.
Professional consultation. Always consult a qualified technician before performing work on safety-critical systems including but not limited to: anti-lock brakes (ABS), supplemental restraint systems (SRS/airbags), fuel delivery, ignition, emissions-related components, and any circuit connected to the Powertrain Control Module (PCM). Incorrect wiring or fuse substitution on these systems can cause personal injury, fire, or permanent damage to vehicle electronics.
Affiliate links. Some links on this site are Amazon affiliate links. Riot Mind Studios, LLC earns a small commission on qualifying purchases at no additional cost to you. Affiliate links do not influence the data or technical content published on this site.
Third-party sources. Some data on this site is derived or cross-referenced from third-party sources including Ford Motor Company factory documentation, ALLDATA, and community-sourced vehicle databases. Riot Mind Studios, LLC does not represent Ford Motor Company, Lincoln, Mercury, or any affiliated brand in any capacity. All trademarks, model names, and manufacturer references are the property of their respective owners and are used here for identification purposes only.
