Mercury Mountaineer (2002-2005) fuses and relays

Fuse box diagram (location and assignment of electrical fuses and relays) for Mercury Mountaineer (2002, 2003, 2004, 2005).

Fuse box diagram: Mercury Mountaineer (2002-2005)

Cigar lighter / power outlet fuses in the Mercury Mountaineer are the fuse #24 (Cigar lighter) in the Instrument panel fuse box, and fuses #7 (Power Point #2), #9 (Power Point #1) in the Engine Compartment Fuse Box.

Passenger Compartment Fuse Box

The fuse box is located under the instrument panel on the driver’s sideThe location of the fuses in the passenger compartment: Mercury Mountaineer (2002-2005)

Fuse box diagram

Interior fuse box diagram: Mercury Mountaineer (2002, 2003, 2004, 2005)


Assignment of the fuses in the Passenger Compartment Fuse Box
Fuse LocationFuse AmpPassenger Compartment Fuse Panel Description
130A2002: Radio Sense, 4x4, ABS Control Module

2003-2005: Memory seat module, Driver power seat, Driver power lumbar
220A2002: Folding Mirror, Moon Roof, Heated Seats, Moon roof

2003-2005: Heated seats (2003), Moonroof
320ARadio, Amplifier, DVT, Power Antenna (2002)
45A2002: Digital Transmission Range Sensor
2003-2005: Front wiper module
515AFlasher relay (Turn, hazards)
610A2002-2003: Right horn
2004-2005: Key-in-chime
715AHeated mirrors
85A2002: Washer Pump Relays (Front and Rear), Front Wiper Control
2003-2005: Heated PCV (4.0L engine only)
915A2002: Rear Wiper Coil and Contact
2003-2005: Not used
1010A2002-2003: Heated backlight relay coil, Heated seat module, A/C clutch contact, Temp Blend Actuator (2002)

2004-2005: Heated backlight relay coil, A/C clutch contact
1120A2002-2003: Not used (spare)
2004-2005: Heated seats
125A2002: Foglamp Switch,4x4 module
2003: 4x4 module
2004-2005: Not used
135A2002: Over Drive Cancel Switch, GEM Start, Flex Fuel Sender
2003-2005: Overdrive cancel switch
155A2002: 4 x 4, Memory Seat Disable
2003-2005: Rear wiper module, Cluster, TPMS (2003)
165A2002: Power Mirror, Security Module (turn), Manual Climate Control
2003-2005: Power mirror, Manual climate control, TPMS
1715ADelayed accessory relay coil/Battery saver coil and contact/Reading and glove box lamps
1810A2002-2003: Left horn
2004-2005: Flexible fuel pump
1910A2002: Not Used
2003-2005: Restraint Control Module (RCM)
205A2002: Memory Module, GEM Module

2003: Driver seat switch, Memory switch, Driver seat module, BSM, Sunload sensor

2004-2005: Memory driver seat switch, Driver seat module, Body Security Module (BSM), PATS LED
215AInstrument cluster, Compass, Flasher coil
2210A2002: Not Used
2003-2005: ABS, IVD Controller
2315A2002: Brake Pedal Position Switch
2003: Brake pedal position switch, Driver brake applied relay, Redundant cruise deactivate switch
2004-2005: Not used
2415ACigar lighter, OBD II
255AMode-Temperature actuator for auxiliary climate control, Trailer tow battery charge relay coil, TPMS (2004-2005)
267.5AReverse park aid, Brake shift interlock, Approach lamp relay coil (2003) IVD switch
277.5A2002: Electronic Compass Mirror, Security Module, Digital Transmission Range Sensor - Backup Lamps
2003-2005: Automatic dimming mirror, Digital transmission range sensor, Backup lamps
285A2002: Air Bag Diagnostics
2003-2005: Radio (Start)/DVD (Start)
295A/10A2002: 4 x 4, GEM Module signal, ABS Control Module, Moon Roof
2003-2005: Digital transmission range sensor, PWR feed to fuse #28 (Start feed)
305ADaytime Running Lamps (DRL), DEATC climate controller, Manual climate control, Manual climate control temp blend actuator

Passenger compartment fuse panel (top side)

These relays are located on the reverse side of the passenger compartment fuse panel.
To access the relays you must remove the passenger compartment fuse panel.

Passenger compartment fuse panel (top side): Mercury Mountaineer (2002, 2003, 2004, 2005)

Passenger compartment fuse panel (top side)
2Rear defrost
3Delayed accessory
4Front Washer Pump (2002)
5Battery saver
6Rear Washer Pump (2002)
7Interior Lamps (2002)

Engine Compartment Fuse Box (Power distribution box)

The Power distribution box is located in the engine compartment (on the driver’s side), under the coverThe location of the fuses in the engine compartment: Mercury Mountaineer (2002-2005)

Fuse box diagram (2002)

Under-hood fuse box diagram: Mercury Mountaineer (2002)


Assignment of the fuses and relays in the Engine Compartment Fuse Box (2002)
Fuse/Relay LocationFuse Amp RatingPower Distribution Box Description
220A**Door Locks
320A**GCC Pusher Fan (export only)
430A**Heated Backlight
660A**Circuit Breaker
720A**Power Point #2
8Not Used
920A**Power Point #1
1020A**ABS Module
1250A**Ignition Relay
1330A**Trailer Tow Battery
1410 A*Fog Lamps
1615 A*Headlamp Switch
1720A*4x4 (v-batt 2)
1820A*4x4 (v-batt 1)
1920A**High Beam Relay
2030A**Electric Brake
21Not Used
2220A**Autolmap; Low Beam
2330A**Ignition Switch
2410 A*Rear Fog Lamps
2520A*Security Module (horns)
2615A*Fuel Pump
2720A*Trailer Tow Lamps
2810 A*Daytime Running Lamps (DRL)
30Not Used
31Not Used
32Not Used
3330A**Auxiliary Blow er Motor
3430A**Power Seats
35Not Used
3640A**Blower Motor
3715A*A/C Clutch
3815 A*Coil On Plug
3915 A*High Beam
4015 A*PTEC Power
4210 A*Right Low Beam
4310 A*Left Low Beam
4410 A*High Beam Relay
457.5A*Right High Beam (export only)
4615 A*Injectors
47Daytime Running Lamps Relay, GCC Pusher Fan (export)
48Fuel Pump Relay
49High Beam Relay
50Fog Lamp Relay
51Autolamp Relay
52A/C Clutch Relay
53Park Lamp Relay (export)
54Wiper Rim / Park Relay
55Blower Motor Relay
56Starter Relay
57PTEC Relay
58Ignition Relay
59Wiper High/Low Relay
60PCM Diode
61A/C Clutch Diode
6730A CBDelayed accessory
* Mini Fuses
** Maxi Cartridge Fuses

Fuse box diagram (2003-2005)

Under-hood fuse box diagram: Mercury Mountaineer (2003, 2004, 2005)


Assignment of the fuses and relays in the Engine Compartment Fuse Box (2003, 2004, 2005)
Fuse/Relay LocationFuse AmpPower Distribution Box Description
160A**PJB #1
3Not used
430A**Rear defrost
540A**Anti-lock Brake System (ABS) pump
660A**Delayed accessory, Power windows, Audio
720A**Power point #2
8Not used
920A**Power point #1
1030A**ABS module (valves)
1140A**Powertrain Control Module (PCM)
1250 A**Ignition relay, Starter relay
1340A**Trailer tow battery charge, Trailer tow turn signals
1410A*2003-2004: Daytime Running Lamps (DRL) (Canada)
2005: Not used
1515A*Memory (PCM/DEATC/Cluster), Courtesy lamps
1615A*Park lamps, Autolamp parklamps, Front foglamps relay coil
17202003: 4x4 (v-batt 2)
2004-2005: Not used
1820A*2004: 4x4 (v-batt 1)
2004-2005: PCM with two-speed 4x4 clutch
1920A**High beam relay
2030A**Trailer electric brake module
2130A**Front wiper motor
2220A**Low beam, Autolamp
2330A**Ignition switch, PCM diode
24Not used
2515A*2003: Not Used
2004-2005: Brake on-off
2620A*Fuel pump
2720A*Trailer tow- park lamps, Trailer tow- back-up
2820A*Horn relay
2960A**PJB #2
3020A**Rear wiper motor
31Not used
32Not used
3330A**Auxiliary blower motor
3430A**Passenger power seat, Adjustable pedals (non-memory)
35Not used
3640A**Blower motor
3715A*A/C clutch relay, Transmission
3815A*2003: Coil on plug
2004-2005: HEGO, VMV, CMS, ESM, CVS
3915A*Injectors, Fuel pump relay coil
4015A*2003: PTEC power
2004-2005: PCM power
4115A*2003-2004: HEGO, VMV, CMS, PCM diode, ESM, CVS

2005: Coil on plug (4.6L engine only), Ignition coil (4.0L engine only)
4210 A*Right low beam
4310 A*Left low- beam
4415A*Front foglamps
452A*2003: Brake pressure switch (ABS)
2004-2005: Brake pressure switch (non-AdvanceTrac vehicles)
4620A*High beams
47Horn relay
48Fuel pump relay
49High beam relay
50Front fog lamps relay
512003: DRL relay (Canada)/AdvanceTrac relay (U.S.)
2004-2005: DRL relay (Canada)
52A/C clutch relay
53Trailer tow right turn relay
54Trailer tow left turn relay
55Blower motor relay
56Starter relay
572003: PTEC relay
2004-2005: PCM relay
58Ignition relay
592003: Driver brake applied relay (vehicles equipped with AdvanceTrac only)
2004-2005: Not used
60PCM diode
61A/C clutch diode
6230A CBPower windows circuit breaker
* Mini Fuses
** Cartridge Fuses

Rear Relay Box

The relay box is located on the rear passenger side quarter trim panel

Rear Relay Box: Mercury Mountaineer (2002, 2003, 2004, 2005)

Rear Relay Box
Relay LocationDescription
142002: Rear fog lamps (export)
2003-2005: Not used
15Trailer Tow back up lamps
16Not Used
172002-2003: Rear Wipers
2004-2005: Not Used
182002: Trailer Tow Stop EAO
2003-2005: Not Used
19Trailer Tow Park Lamps
20Trailer Tow Battery Charge
21Not Used
222002-2003: Approach Lamps
2004-2005: Not Used
23Not Used
Diode 3Not Used
Diode 4Not Used
Mercury Mountaineer (2002-2005) fuses and relays July 6, 2019 admin