Fuses and relays Infiniti FX35 / FX45 (S50), 2002–2009

The Infiniti FX crossover was a pioneer among premium urban all-wheel-drive vehicles, combining luxury performance with light off-road capability. Introduced to the U.S. market in 2002 for the 2003 model year, all FX variants were built on Nissan’s Front Mid-ship (FM) platform, which positions the engine behind the front axle line. This layout yields an optimal front-to-rear weight distribution, significantly enhancing vehicle handling and chassis balance during cornering.

This article provides detailed fuse and relay box diagrams for the first-generation Infiniti FX35 / FX45 (S50 chassis; model years 2003–2008). It includes component location diagrams, block photos, and circuit assignments. The cigarette lighter fuse is highlighted in bold.

Engine Compartment

Component Locations:
1. Fuse Box No. 2,
2. Relay Box No. 1,
3. Fuse Box No. 1 / IPDM E/R,
4. Main Battery Power Fuse Block,
5. 2006–2008: Relay Box No. 2,
6. Windshield wiper motor,
7. ABS actuator and control module

Fuse Box No. 1 (IPDM E/R)

Located behind the engine compartment trim panel. Remove the cover to gain access.

Overview.

Diagram
No.	Description	A
71	Parking lamps, headlight aiming control module, tail lamp control module, license plate lamps, glove box lamp, instrument cluster illumination	10
72	Right headlight (high beam)	10
73	Front windshield wiper relay	30
74	Left headlight (high beam)	10
75	Rear window defogger relay	20
76	Right headlight (low beam)	15
77	Engine Control Module (ECM), ECM relay, Mass Air Flow (MAF) sensor, crankshaft position sensor, camshaft position sensors, ignition coils, EVAP purge valve, variable valve timing (VVT) solenoids	20
78	Windshield wiper de-icer	15
79	A/C compressor clutch	10
80	Rear window defogger relay, Fuse 8	20
81	Fuel pump relay, Engine Control Module (ECM)	15
82	ABS actuator and electric unit	10
83	Transmission Control Module (TCM), reverse lamp relay, display unit, navigation module, rear view camera	10
84	Front and rear windshield washers	10
85	Heated oxygen sensors (HO2S), air/fuel ratio (A/F) sensors	10
86	Left headlight (low beam)	15
87	Electronic throttle control actuator relay, Engine Control Module (ECM)	15
88	Front fog lamp relay	15
89	Data Link Connector (DLC/OBD-II), EVAP valve, Variable Induction Air Control System (VIAS - VK45DE)	10
Relays
R1	Engine Control Module (ECM)
R2	Headlight high beam
R3	Headlight low beam
R4	Starter motor
R5	Ignition switch
R6	Radiator cooling fan (No. 3)
R7	Radiator cooling fan (No. 1)
R8	Radiator cooling fan (No. 2)
R9	Electronic throttle control
R10	Fuel pump relay
R11	Front fog lamps

Fuse Box No. 2

Located adjacent to the battery.

Overview.

Diagram
No.	Description	A
31	Trailer tow harness / external lighting	30
32	Audio unit, subwoofer, display unit, A/C & audio controller, navigation module, DVD player, hands-free phone module	15
33	Alternator	10
34	Horn relay	15
35	Intelligent Cruise Control (ICC) module	10
36	Daytime Running Lights (DRL)	10
37	Transmission Control Module (TCM)	10
38	Intelligent Key control unit, steering column lock, ignition switch	10
F	Ignition switch, starter relay	40
G	Radiator cooling fan relay No. 1, radiator cooling fan relay No. 3	40
H	Radiator cooling fan relay No. 2	40
I	ABS actuator and electric unit	50
J	-	-
K	Accessory relay No. 2 (Fuses 2, 3)	30
L	ABS control module	30
M	Body Control Module (BCM), automatic drive positioner (ADP) module, power seats, power windows, rear wiper, power sunroof, interior illumination, turn signals, and hazard warning lamps	50
Relays
R1	Horn relay
R2	Accessory relay No. 2

Main Power Fuse Block

Mounted directly on the positive battery terminal.

Diagram
No.	Description	A
A	Alternator, fuses B and C	120
B	Fuses 32, 33, 34, 35, 36, 37, 38, F, G, H, I, K, L, and M	100
C	High beam relay (fuses 72, 74), low beam relay (fuses 76, 86), fuses 71, 73, 75, 87, and 88	80
D	Accessory relay (fuses 4, 6, 7), blower motor relay (fuses 10, 11), fuses 17, 18, 19, 20, 21, and 22	60
E	Ignition relay (A/C relay, front wiper relay, wiper speed relay, fuses 81, 82, 83, 84, 85, 89), fuses 77, 78, 79, and 80	80

Relay Box No. 1

Item 2 in the engine compartment component diagram.

Diagram
No.	Relay
R1	Daytime Running Lights (DRL)
R2	Intelligent Cruise Control (ICC)
R3	Rear window defogger

Relay Box No. 2

Item 5 in the engine compartment component diagram.

Diagram
No.	Relay
R1	Reverse lamps
R2	-

Passenger Compartment

Component Locations: 1. Body Control Module (BCM), 2. Fuse Block (located in the driver's footwell on the left kick panel, behind an access cover), 3. Intelligent Key Control Unit, 4. Steering Lock Assembly, 5. NATS Immobilizer Antenna Amplifier, 6. Lane Departure Warning (LDW) Camera Control Unit, 7. Tire Pressure Monitoring System (TPMS) Control Unit, 8. Telematics (TEL) Adapter Unit, 9. Display Control Unit, 10. Unified Meter and A/C Amp. Unit, 11. Intelligent Cruise Control (ICC) Control Unit, 12. Engine Control Module (ECM), 13. All-Wheel Drive (AWD) Control Unit, 14. Automatic Drive Positioner (ADP) Control Unit, 15. Navigation Control Unit, 16. Airbag Diagnosis Sensor Unit (SRS), 17. Rear View Camera Control Unit, 18. Driver Power Seat Control Unit.

 
Accessing the panel with the cover removed.

Overview.

Diagram
No.	Description	A
1	Body Control Module (BCM), Engine Control Module (ECM), fuel injectors	15
2	Cargo area auxiliary power socket	15
3	Rear console auxiliary power socket	15
4	Front auxiliary power socket 2 Infiniti FX35 / FX45 cigarette lighter fuse	15
5	-	-
6	Audio unit, display unit, satellite radio, Unified Meter and A/C Amp. unit, antenna amplifier, Body Control Module (BCM), rear view camera, navigation system, climate and audio control unit, Intelligent Key unit, DVD player, telematics module, combination meter, Intelligent Key exterior antenna	10
7	Front auxiliary power socket 1 Cigarette lighter fuse 1	15
8	Heated outside mirrors	15
9	Combination meter, Automatic Drive Positioner (ADP) control unit	10
10	Blower motor, Unified Meter and A/C Amp. unit	15
11	Blower motor, Unified Meter and A/C Amp. unit	15
12	Intelligent Cruise Control (ICC), Engine Control Module (ECM), Unified Meter and A/C Amp. unit, stop lamp switch, shift lock solenoid, A/C compressor, display unit, navigation system, telematics module, Intelligent Key, steering angle sensor, Snow Mode switch, Lane Departure Warning (LDW), auto-dimming rearview mirror (compass), rear window defogger relay, AWD control unit, ASCD steering wheel switch	10
13	Supplemental Restraint System (SRS) airbags	10
14	Combination meter	10
15	Heated front seats	10
16	2003–2005: Heated oxygen sensors (HO2S), air/fuel ratio (A/F) sensors	10
17	Bose® audio amplifier	20
18	Power liftgate control unit	15
19	Combination meter, Unified Meter and A/C Amp. unit, Data Link Connector (DLC), rear view camera, security indicator, clock	10
20	Stop lamp switch, Intelligent Cruise Control (ICC), ABS module, Unified Meter and A/C Amp. unit, tail lamp control module	10
21	All-Wheel Drive (AWD) transfer control unit	10
22	Body Control Module (BCM), ignition switch lock, NATS immobilizer antenna amplifier, Automatic Drive Positioner (ADP) control unit	15
Relays
R1	Blower motor / heater
R2	Accessory

Body Components

 
Component Locations: 1. Bose® audio amplifier, 2. Power liftgate control unit, 3. Rear lamp control module, 4. 2003–2005:  Reverse lamp relay