2003 INFINITI QX4

Infiniti QX4 2003 - BUZZERS, RELAYS & TIMERS

Infiniti QX4 2003 BUZZERS, RELAYS & TIMERS LOCATION

Component	Component Location
Accessory Relay	On fuse block (J/B). See Fig. 5 .
A/C Relay	In relay box-1. See Fig. 3 .
Audio Amplifier Relay	Behind left luggage room trim. See Fig. 7 .
Blower Motor Relay	On fuse block (J/B). See Fig. 5 .
Door Mirror Defogger Relay	Behind left luggage room trim. See Fig. 7 .
ECM Relay	In relay box-2. See Fig. 4 .
Front Foglight Relay	In relay box-1. See Fig. 3 .
Fuel Pump Relay-1	In relay box-1. See Fig. 3 .
Fuel Pump Relay-2	In relay box-2. See Fig. 4 .
Headlamp Left Relay	In relay box-1. See Fig. 3 .
Headlamp Right Relay	In relay box-1. See Fig. 3 .
Horn Relay	In relay box-1. See Fig. 3 .
ICC Brake Hold Relay	In relay box-1. See Fig. 3 .
ICC Warning Chime	Behind left front kick panel. See Fig. 7 .
Ignition Relay	On fuse block (J/B). See Fig. 5 .
Park/Neutral Position Relay	In relay box-2. See Fig. 4 .
Power Socket Relay	Behind left side of dash, above fuse block (J/B).
Power Window Relay	On top of fuse block (J/B). See Fig. 5 .
Rear Power Socket Relay	On top of fuse block (J/B). See Fig. 5 .
Rear Window Defogger Relay	In relay box-1. See Fig. 3 .
Relay (A/T Device)	On A/T device, at base of shift selector lever.
Taillamp Relay	In relay box-1. See Fig. 3 .
Transfer Motor Relay	On left side of engine compartment, behind relay box-1. See Fig. 2 .
Transfer Shift Hi Relay (4WD)	In relay box-1. See Fig. 3 .
Transfer Shift Low Relay (4WD)	In relay box-1. See Fig. 3 .

Infiniti QX4 2003 - CIRCUIT PROTECTION DEVICES

Infiniti QX4 2003 CIRCUIT PROTECTION DEVICES LOCATION

Component	Component Location
Circuit Breaker	On top of fuse block (J/B). See Fig. 5 .
Fuse Block (J/B)	Left side of dash. See Fig. 6 .
Fuse & Fusible Link Box	In relay box-2. See Fig. 4 .
Relay Box-1	On left fenderwell. See Fig. 2 .
Relay Box-2	On right fenderwell. See Fig. 2 .

Infiniti QX4 2003 - CONTROL UNITS

Infiniti QX4 2003 CONTROL UNITS LOCATION

Component	Component Location
ABS Actuator & Electric Unit	On right side of engine compartment. See Fig. 2 .
A/C Auto Amplifier (W/NAVI)	Behind center of dash. See Fig. 6 .
A/C Auto Amplifier (W/O NAVI)	Behind center of dash. See Fig. 6 .
Air Bag Diagnosis Sensor Unit	Below rear of center console. See Fig. 6 .
ASCD Control Unit	Behind left kick panel. See Fig. 6 .
A/T Device	At base of selector lever.
Combination Flasher Unit	Behind left side of dash. See Fig. 6 .
Daytime Light Control Unit (Canada)	On right front fenderwell. See Fig. 2 .
Display & NAVI Control Unit	Behind center of dash. See Fig. 6 .
ECM	Behind center of dash. See Fig. 6 .
Fan Control Amplifier	Behind glove box.
ICC Unit	Behind left luggage room trim. See Fig. 7 .
Left Seat Control Unit	Under driver's seat. See Fig. 6 .
NATS IMMU	On ignition key cylinder. See Fig. 6 .
Rear Speaker Amplifier	Behind left luggage room trim. See Fig. 7 .
Smart Entrance Control Unit	Behind dash, next to fuse block. See Fig. 6 .
Transfer Control Unit	Behind lower center dash panel. See Fig. 6 .
Transmission Control Module (TCM)	Behind dash, left of steering column. See Fig. 6 .

Infiniti QX4 2003 - MOTORS

Infiniti QX4 2003 MOTORS LOCATION

Component	Component Location
Air Mix Door Motor	Behind center of dash, on bottom of heater unit.
ASCD Pump	On right front fenderwell. See Fig. 2 .
Blower Motor	Below right side of dash.
Front Wiper Motor	On right side of firewall. See Fig. 2 .
Fuel Pump	In fuel tank.
Headlight Aiming Motor (Left)	Behind left headlight.
Headlight Aiming Motor (Right)	Behind right headlight.
Intake Door Motor	Behind glove box, on heater intake unit.
Mode Door Motor	Behind center of dash, on heater unit.
Power Antenna	On right front fender.
Rear Wiper Motor	On lower right side of hatch.
Sun Roof Motor	At front of sun roof opening.
Transfer Control Device	On left rear side of transmission.
Transfer Motor	On left rear of transfer case.
Washer Motor (Front)	On washer fluid reservoir.
Washer Motor (Rear)	On washer fluid reservoir.

Infiniti QX4 2003 - SENDING UNITS & SENSORS

Infiniti QX4 2003 SENDING UNITS & SENSORS LOCATION

Component	Component Location
Ambient Air Temperature Sensor	Center front of engine compartment.
Ambient Sensor	Center front of engine compartment.
A/T Fluid Temperature Sensor	On control valve lower body, in transmission.
Auto Light Sensor	At top right of dash, right of sunload sensor. See Fig. 7 .
Brake Pressure Sensor	On bottom of brake master cylinder. See Fig. 7 .
Camshaft Position Sensor (PHASE)	On engine front cover, facing camshaft sprocket. See Fig. 1 .
Crankshaft Position Sensor (POS)	On rear of engine oil pan.
Crankshaft Position Sensor (REF)	On lower right front of engine, near oil filter. See Fig. 1 .
Engine Coolant Temperature Sensor	At rear of engine, on water outlet. See Fig. 1 .
EVAP Control System Pressure Sensor	Left rear underside of vehicle, near fuel tank.
Fuel Level Sensor Unit	Integral to fuel tank gauge unit.
Fuel Tank Gauge Unit	Under left rear seat, on top of fuel tank.
G Sensor	Below rear of center console. See Fig. 6 .
Heated Oxygen Sensor 1 (Bank 1)	On right exhaust manifold. See Fig. 1 .
Heated Oxygen Sensor 1 (Bank 2)	On left exhaust manifold. See Fig. 1 .
Heated Oxygen Sensor 2 (Bank 1)	On right front exhaust tube, upstream of right converter. See Fig. 1 .
Heated Oxygen Sensor 2 (Bank 2)	On left front exhaust tube, upstream of left converter. See Fig. 1 .
ICC Sensor	Behind right side of front bumper. See Fig. 7 .
Intake Air Temperature Sensor	On lower left front of engine compartment, in air duct housing.
Intake Sensor	Behind center of dash, on cooling unit.
Intake Valve Timing Control Position Sensor (B1)	On front of right cylinder head.
Intake Valve Timing Control Position Sensor (B2)	On front of left cylinder head.
In-Vehicle Sensor	Attached to instrument lower cover, right of steering column.
Knock Sensor	On top rear of engine, below intake manifold. See Fig. 1 .
Mass Airflow Sensor	On air intake assembly, near air cleaner box. See Fig. 1 .
Rear Revolution Sensor (2WD)	On left rear of transmission extension assembly.
Rear Revolution Sensor (4WD)	On top of transmission adapter case.
Refrigerant Pressure Sensor	On A/C liquid tank, in front of battery. See Fig. 1 .
Satellite Sensor (Left)	At base of left "B" pillar.
Satellite Sensor (Right)	At base of right "B" pillar.
Sunload Sensor	On right defroster grille. See Fig. 7 .
Thermal Transmitter	At rear of engine, on water outlet.
Throttle Position Sensor	On throttle body.
Turbine Revolution Sensor	On top front of transmission case.
Wheel Speed Sensor (4)	On respective wheel hub assemblies.

Infiniti QX4 2003 - SOLENOIDS & SOLENOID VALVES

Infiniti QX4 2003 SOLENOIDS & SOLENOID VALVES LOCATION

Component	Component Location
Boost Solenoid	Inside brake booster. See Fig. 7 .
EVAP Canister Purge Volume Control Solenoid Valve	On left rear of engine, near throttle body. See Fig. 1 .
EVAP Canister Vent Control Valve	Left rear underside of vehicle, near fuel tank.
IACV-AAC Valve	On left rear of engine. See Fig. 1 .
Intake Valve Timing Control Valve (B1)	On top right side of engine.
Intake Valve Timing Control Valve (B2)	On top left side of engine.
Line Pressure Solenoid Valve	On control valve upper body, in transmission.
Overrun Clutch Solenoid Valve	On control valve upper body, in transmission.
Shift Lock Solenoid	At base of shifter lever, integral to A/T device.
Shift Solenoid Valve A	On control valve upper body, in transmission.
Shift Solenoid Valve B	On control valve upper body, in transmission.
Swirl Control Valve Control Solenoid Valve	On top front of engine. See Fig. 1 .
Torque Converter Clutch Solenoid Valve	On control valve lower body, in transmission.
Vacuum Cut Valve By-Pass Valve	Left rear underside of vehicle, near fuel tank.
VIAS Control Solenoid Valve	On top front of engine. See Fig. 1 .

Infiniti QX4 2003 - SWITCHES

Infiniti QX4 2003 SWITCHES LOCATION

Component	Component Location
ASCD Brake Switch	On bracket, above brake pedal.
A/T Fluid Temperature Switch	On control valve lower body, in transmission.
ATP Switch	On left rear of transfer case.
Brake Fluid Level Switch	On brake fluid reservoir.
Glass Hatch Switch	In center of back door.
Hood Switch	On left front of engine compartment. See Fig. 2 .
ICC Brake Switch	On bracket, above brake pedal. See Fig. 7 .
Neutral-4Lo Switch	On left rear of transfer case.
Oil Pressure Switch	On lower right front of engine, on oil cooler bracket.
Parking Brake Switch	At base of park brake lever.
Park/Neutral Position Switch	On right rear of transmission.
Park Position Switch	Integral to A/T device.
Power Steering Oil Pressure Switch	Lower right front of engine compartment, on power steering high pressure tube.
Seat Belt Buckle Switch	In driver's seat belt buckle.
Steering Wheel Receiver Control Switch	Behind center of dash. See Fig. 6 .
Stoplight Switch	On bracket, above brake pedal. See Fig. 7 .
Swirl Control Valve Vacuum Check Switch	At left rear of engine compartment, near brake fluid reservoir. See Fig. 1 .
Throttle Position Switch	Integral to throttle position sensor.
Wait Detection Switch	On left front of transfer case.
Washer Level Switch	Lower right front of engine compartment.

Infiniti QX4 2003 - MISCELLANEOUS

Infiniti QX4 2003 MISCELLANEOUS LOCATION

Component	Component Location
A/T Dropping Resistor	On right side of engine compartment, near battery. See Fig. 2 .
Condenser (Ignition)	On top front of engine.
Data Link Connector (DLC)	On lower dash panel, left of steering column.
Diode (Combination Meter, Glass Hatch Switch)	Behind left kick panel.
Diode (Combination Meter, Parking Brake Switch)	Behind left kick panel.
Diode (Headlamp Battery Saver Control Unit, Power Window Relay, Smart Entrance Control Unit)	Behind left side of dash.
Diode (Left Headlamp Relay, ECM)	Behind left side of dash.
Diode (Luggage Room Lamp, Back Door Switches)	Behind left luggage room trim.
Diode (Park/Neutral Position Switch, TCM)	Behind left side of dash.
Diode (Rear Door Switches)	Behind left kick panel.
Diode (Rear Window Defogger Relay)	Behind center of dash.
Diode (Stoplight Switch, A/T Device)	Behind right kick panel.
GPS Antenna	Behind center of dash, above display & NAVI control unit. See Fig. 6 .
Injectors (6)	On top of engine. See Fig. 1 .
Transfer Dropping Resistor	On right side of engine compartment, between battery & inner fender. See Fig. 2 .

Infiniti QX4 2003 - CONNECTORS

Infiniti QX4 2003 CONNECTORS LOCATION

Component	Component Location
B1 (SMJ)	At left end of dash.
B10 (White, 10 Pin)	At left "B" pillar.
B23 (White, 12 Pin)	Above left taillight assembly.
B24 (White, 6 Pin)	Above left taillight assembly.
B25 (Brown, 6 Pin)	Above left taillight assembly.
B43 (Gray, 8 Pin)	Under left rear of vehicle.
B50 (White, 20 Pin)	At right kick panel.
B51 (White, 24 Pin)	At right kick panel.
B52 (White, 16 Pin)	At right kick panel.
B70 (White, 10 Pin)	At right "B" pillar.
B77 (White, 12 Pin)	At right kick panel.
B78 (Gray, 8 Pin)	At right side of transfer case.
B79 (Black, 4 Pin)	At right side of transfer case.
B80 (Black, 8 Pin)	At right side of transfer case.
B82 (Gray, 6 Pin)	At right side of transfer case.
B86 (White, 10 Pin)	Under center console.
B88 (Gray, 20 Pin)	At right kick panel.
B90 (White, 10 Pin)	Under center console.
B101 (Gray, 8 Pin)	At left "B" pillar.
B151 (Gray, 2 Pin)	Under left rear of vehicle.
B152 (Gray, 2 Pin)	Under left rear of vehicle.
B156 (White, 18 Pin)	At left end of dash.
B157 (Brown, 16 Pin)	At left end of dash.
B206 (Gray, 8 Pin)	At right side of transfer case.
B207 (Black, 8 Pin)	At right side of transfer case.
B208 (Black, 4 Pin)	At right side of transfer case.
B251 (Gray, 6 Pin)	At right side of transfer case.
D3 (Brown, 16 Pin)	At left lower "A" pillar.
D4 (White, 10 Pin)	At left lower "A" pillar.
D13 (Gray, 12 Pin)	At left lower "A" pillar.
D33 (Brown, 16 Pin)	At right lower "A" pillar.
D34 (White, 6 Pin)	At right lower "A" pillar.
D41 (Brown, 6 Pin)	At right lower "A" pillar.
D50 (White, 10 Pin)	At left lower "B" pillar.
D70 (White, 10 Pin)	At right lower "B" pillar.
D100 (White, 12 Pin)	Above left taillight assembly.
D101 (White, 6 Pin)	Above left taillight assembly.
D102 (Brown, 6 Pin)	Above left taillight assembly.
D105 (White, 16 Pin)	At left side of tailgate.
D106 (White, 4 Pin)	At left side of tailgate.
D107 (White, 2 Pin)	At left top of tailgate.
D108 (White, 1 Pin)	At left top of tailgate.
D205 (White, 16 Pin)	At left side of tailgate.
D206 (White, 4 Pin)	At left side of tailgate.
D300 (White, 2 Pin)	At left top of tailgate.
D301 (White, 1 Pin)	At left top of tailgate.
E1 (SMJ)	At left end of dash.
E48 (Gray, 4 Pin)	At right side of engine compartment.
E49 (Gray, 1 Pin)	At right side of engine compartment.
E102 (Gray, 4 Pin)	At right front of engine.
E104 (Gray, 1 Pin)	At right front of engine.
E116 (White, 18 Pin)	At left end of dash.
E132 (Gray, 8 Pin)	At right side of engine.
E135 (Gray, 8 Pin)	At right side of engine compartment.
E141 (White, 18 Pin)	At left end of dash.
F5 (Blue, 8 Pin)	At left side of engine.
F6 (Green, 8 Pin)	At left side of engine.
F16 (Gray, 2 Pin)	At left side of engine.
F19 (Sky Blue, 2 Pin)	At left side of engine.
F22 (Gray, 16 Pin)	At rear of engine compartment.
F23 (Brown, 24 Pin)	At rear of engine compartment.
F27 (White, 18 Pin)	At rear of engine compartment.
F28 (Sky Blue, 3 Pin)	At right rear of engine compartment.
F100 (Blue, 8 Pin)	At left side of engine.
F101 (Green, 8 Pin)	At left side of engine.
F112 (Sky Blue, 3 Pin)	At right rear of engine compartment.
F115 (Gray, 2 Pin)	At left side of engine.
F116 (Sky Blue, 2 Pin)	At left side of engine.
M1 (SMJ)	At left end of dash.
M2 (SMJ)	At left end of dash.
M5 (Brown, 16 Pin)	At left end of dash.
M6 (White, 10 Pin)	At left end of dash.
M32 (Brown, 24 Pin)	At center of dash.
M33 (Gray, 16 Pin)	At center of dash.
M47 (White, 20 Pin)	At right side of dash.
M62 (White, 6 Pin)	At base of right "A" pillar.
M63 (White, 6 Pin)	At base of right "A" pillar.
M67 (Brown, 16 Pin)	At right end of dash.
M68 (White, 6 Pin)	At right end of dash.
M70 (White, 20 Pin)	At right kick panel.
M71 (White, 24 Pin)	At right kick panel.
M72 (White, 16 Pin)	At right kick panel.
M94 (White, 18 Pin)	At center of dash.
M99 (White, 12 Pin)	At right kick panel.
M100 (Gray, 20 Pin)	At right kick panel.
M101 (Brown, 6 Pin)	At right end of dash.
M112 (Gray, 12 Pin)	At left end of dash.
M114 (White, 18 Pin)	At left end of dash.
M148 (Brown, 16 Pin)	At left end of dash.
R1 (White, 6 Pin)	At base of right "A" pillar.
R2 (White, 6 Pin)	At base of right "A" pillar.
Z1 (White, 20 Pin)	At upper center of dash.

Infiniti QX4 2003 - GROUNDS

Infiniti QX4 2003 GROUNDS LOCATION

Component	Component Location
B11	Under left kick panel. See Fig. 7 .
B22	At lower rear of left rear quarterpanel. See Fig. 7 .
B55	At right kick panel.
B75	At lower rear of right rear quarterpanel.
D210	At lower right of tailgate.
D305	At upper right of tailgate.
E13	At left front of engine compartment. See Fig. 2 .
E41	At right front of engine compartment. See Fig. 2 .
E101	Under fuse & fusible link box.
E112	Near cruise control servo. See Fig. 2 .
F20	At left front of engine. See Fig. 1 .
F25	At left front of engine. See Fig. 1 .
F43	At left front of engine. See Fig. 1 .
F44	At left front of engine. See Fig. 1 .
M4	At left end of dash. See Fig. 6 .
M66	At right end of dash. See Fig. 6 .
M77	Near front wiper motor. See Fig. 2 .
M111	At left end of dash. See Fig. 6 .
M147	At right end of dash. See Fig. 6 .