Mercury Mountaineer (2002 -2005) – fuse box diagram

Year of production: 2002, 2003, 2004, 2005

Passenger compartment fuse panel

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Mercury Mountaineer Second Generation – fuse box – passenger compartment

The fuse panel is located below the instrument panel on the driver’s side.

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No.ACircuits Protected
130Memory seat module, Driver power seat (’03-’05), Driver power lumbar (’05)
220Heated seats (’02), Moonroof
320Radio, Amplifier, Power antenna (’02), DVD
45Front wiper module
515Flasher relay (Turn, hazards)
610Right horn (’02), Key-in-chime (’03-’05)
715Heated mirrors
85’04-’05: Heated PCV (4.0L engine only)
9Not used (spare)
1010Heated backlight relay coil, Heated seat module (’02), Temp blend actuator (’02), A/C clutch contact
1120’03-’05: Heated seats
125’02: Foglamp switch, 4×4 module
135Overdrive cancel switch, Flex fuel sender (’02-’03)
145PATS module
155Rear wiper module, Cluster, TPMS (’02-’03)
165Power mirror, Manual climate control, TPMS
1715Delayed acc. coil, Battery saver, Interior lamps (front and rear), Glove compartment lamp
1810Left horn (’02-’03), Flexible fuel pump (’04-’05)
1910RCM, PAD indicator (’02)
205Memory driver seat switch, Driver seat module, Body Security Module (BSM), PATS LED, Sunload sensor (’02-’03)
215Instrument cluster, Compass, Flasher coil
2210ABS, IVD Controller
2315’02-’03: Brake pedal position switch, Driver brake applied relay, Redundant cruise deactivate switch
2415Cigar lighter, OBD II
255Mode-Temperature actuator for auxiliary climate control, Trailer tow battery charge coil, TPMS (’04-’05)
267.5Reverse park aid, Brake shift interlock, Approach lamp relay coil (’02), IVD switch
277.5Automatic dimming mirror, Digital transmission range sensor, Backup lamps
285Radio (Start)/DVD (Start)
2910Digital transmission range sensor, PWR feed to fuse #28 (Start feed)
305Daytime Running Lamps (DRL), Remote solenoid, DEATC climate controller, Manual climate control, Manual climate control temp blend actuator

Passenger compartment fuse panel (top side)

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Mercury Mountaineer Second Generation – fuse box – passenger compartment (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.

No.Circuits Protected
1Flasher
2Rear defrost
3Delayed accessory
4Open
5Battery saver
6Open
7Open

Engine Compartment Fuse Box

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Mercury Mountaineer Second Generation – fuse box – power distribution box

The power distribution box is located in the engine compartment. The power distribution box contains high-current fuses that protect your vehicle’s main electrical systems from overload.

No.ACircuits Protected
160PJB
230BSM
3Not used
430Rear defrost
540Anti-lock Brake System (ABS) pump
660Delayed accessory, Power windows (’04-’05), Audio (’04-’05)
720Power point #2
8Not used
920Power point #1
1030ABS module (valves)
1140PTEC (’02-’03), Powertrain Control Module (PCM) (’04-’05)
1250Ignition relay/Starter relay
1340Trailer tow battery. Trailer tow turn signals
1410’02-’03: Daytime Running Lamps (DRL) (Canada)
1515Memory (KAPWR) (’02), Memory (PCM/DEATC/Cluster) (’03-’05), Courtesy lamps (’03-’05)
1615Headlamp switch (’02-’03), Foglamp switch (’03), Park lamps (’04-’05), Autolamp parklamps (’04-’05), Front foglamps relay coil (’04-’05)
17Not used
18204×4 (v-batt 1) (’02-’03), PCM with two-speed 4×4 clutch (’04-’05)
1920High beam relay
2030Trailer electric brake module
2130Front wiper motor
2220Autolamp; Low beam
2330Ignition switch, PCM diode (’04-’05)
24Not used
2515’04-’05: Brake on-off
2615’02-’03: Fuel pump
20’04-’05: Fuel pump
2720Trailer tow lamps, Trailer tow back-up
2820Horn relay
2960PJB
3020Rear wiper motor
31Not used
32Not used
3330Auxiliary blower motor
3430Power seats, Adjustable pedals
3520Rear power point (’02)
3640Blower motor
3715A/C clutch relay/Transmission
3815Coil on plug (’02-’03), HEGO (’04-’05), VMV (’04-’05), CMS (’04-’05), ESM (’04-’05), CVS (’04-’05)
3915Injectors/Fuel pump relay
4015PTEC power (’02-’03), PCM power (’04-’05)
4115HEGO (’02-’03), VMV (’02-’03), CMS (’02-’03), PTEC (’02-’03), Coil on plug (’04-’05; 4.6L engine only), Ignition coil (’04-’05; 4.0L engine only)
4210Right low beam
4310Left low beam
4415Front foglamps
455Brake pressure switch (’02)
2Brake pressure switch (ABS) (’03-’05)
4620High beams
6230Circuit Breaker: Delayed accessory (’02), Power windows (’03-’05)
Relay
47Horn
48Fuel pump
49High beam
50Fog lamp
51’02-’03: Daytime Running Lamps
52A/C clutch
53Trailer tow right turn
54Trailer tow left turn
55Blower motor
56Starter
57’02-’03: PTEC’04-’05: PCM
58Ignition
59’02-’03: Driver brake applied or Daytime Running Lamps
Diode
60PCM
61A/C clutch

Rear Relay Box

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Mercury Mountaineer Second Generation – fuse box – rear relay box

The relay box is located on the rear passenger side quarter trim panel. To access this box you must remove the trim panel.

No.

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Circuits Protected
14Not used
15Trailer tow back-up lamps
16Not used
17Not used
18Not used
19Trailer tow park lamps
20Trailer tow battery charge
21Not used
22’02: Approach lamps
23Not used
Diode
3Not used
4Not used

Auxiliary relay box (trailer tow)

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Mercury Mountaineer Second Generation – fuse box – auxiliary relay box

The relay box is located on the front right fender well underneath the speed control module.

RelayDescription
Relay 64Trailer Tow (left turn)
Relay 65Trailer Tow (right turn)
Relay 66Not used

WARNING: Terminal and harness assignments for individual connectors will vary depending on vehicle equipment level, model, and market