Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
2003 Infiniti Q45FACTORY OEM SERVICE PROCEDURE
External Pages
These are pages that do not belong to the exact selected vehicle (2003 Infiniti Q45), but are still accessible from a link in your vehicle's manual. Be very cautious using repair info from here because these pages may not apply to your vehicle.
- Different car
- Section 1 (Electronic Suspension - Wiring Diagrams)
- Section 2 (Engine Controls - Self-Diagnostics - Q45)
- Section 3 (Wiring Diagrams)
- Section 4 (Engine Controls - Service & Adjustment Specifications)
- Section 5 (Engine Controls - On-Vehicle Adjustments)
- Section 6 (Engine Controls - Basic Diagnostic Procedures)
- Section 7 (Engine Controls - Self-Diagnostics)
- Section 8 (Engine Controls - Self-Diagnostics - 2.2L)
- Section 9 (Engine Controls - Trouble Shooting - No Codes)
- Section 10 (Engine Controls - System & Component Testing)
- Section 11 (Engine Controls - Pin Voltage Charts)
- Section 12 (Vacuum Diagrams)
- Section 13 (Engine Controls - Removal, Overhaul & Installation)
- Section 14 (Engine Performance - Wiring Diagrams)
- Section 15 (Wiring Diagrams)
- Section 16 (Engine Controls - Service & Adjustment Specifications)
- Section 17 (Engine Controls - On-Vehicle Adjustments)
- Section 18 (Engine Controls - Theory & Operation)
- Section 19 (Engine Controls - Basic Diagnostic Procedures)
- Section 20 (Engine Controls - Self-Diagnostics)
- Section 21 (Engine Controls - Self-Diagnostics)
- Section 22 (Engine Controls - Self-Diagnostics)
- Section 23 (Engine Controls - Trouble Shooting - No Codes)
- Section 24 (Engine Controls - System & Component Testing)
- Section 25 (Engine Controls - System & Component Testing)
- Section 26 (Engine Controls - Pin Voltage Charts)
- Section 27 (Vacuum Diagrams)
- Section 28 (Engine Controls - Removal, Overhaul & Installation)
- Section 29 (Wiring Diagrams)
- Section 30 (Engine Controls - On-Vehicle Adjustments - 4 CYL & V6)
- Section 31 (Engine Controls - Basic Diagnostic Procedures - 4 CYL & V6)
- Section 32 (Engine Controls - Self-Diagnostics)
- Section 33 (Engine Controls - Self-Diagnostics - 1.8L - XE, GXE)
- Section 34 (Engine Controls - Self-Diagnostics - Quest)
- Section 35 (Engine Controls - Trouble Shooting - No Codes - 4 CYL & V6)
- Section 36 (Engine Controls - System & Component Testing - 4 CYL & V6)
- Section 37 (Engine Controls - Pin Voltage Charts - 4 CYL & V6)
- Section 38 (Vacuum Diagrams)
- Section 39 (Engine Controls - Removal, Overhaul & Installation)
- Section 40 (Engine Performance Wiring Diagrams)
- Section 41 (Disc Brakes)
- Section 42 (Disc Brakes)
- Section 43 (Starters)
- Section 44 (Automatic A/C-Heater Systems)
- Section 45 (Automatic Transmission Diagnosis - U140E & U140F)
- Section 46 (System Wiring Diagrams)
- Section 47 (System Wiring Diagrams)
- Section 48 (System Wiring Diagrams)
- Section 49 (Overhaul - A650E)
- Section 50 (Automatic Transmission - Diagnosis)
- Section 51 (Diagnosis - U150E)
- Section 52 (Engine Controls - Self-Diagnostics - 3.2L)
- Section 53 (Automatic Transmission Shift Interlock Systems)
- Section 54 (Computer Relearn Procedures - Import)
- Section 55 (Engine Controls Self-Diagnostics - Pathfinder & QX4)
- Section 56 (Engine Controls - Self-Diagnostics)
- Section 57 (Air Bag Restraint Systems)
- Section 58 (Air Bag Restraint Systems)
- Section 59 (Air Bag Restraint Systems)
- Section 60 (Air Bag Restraint Systems)
- Section 61 (System Wiring Diagrams)
- Section 62 (System Wiring Diagrams)
- Section 63 (System Wiring Diagrams)
- Section 64 (System Wiring Diagrams)
- Section 65 (Power Door Locks, Trunk Lid & Fuel Door Release)
- Section 66 (Engine Controls - Service & Adjustment Specifications)
- Section 67 (Engine Controls - On-Vehicle Adjustments)
- Section 68 (Engine Controls - Theory & Operation)
- Section 69 (Engine Controls - Basic Diagnostic Procedures)
- Section 70 (Engine Controls - Self-Diagnostics)
- Section 71 (Engine Controls - Self-Diagnostics)
- Section 72 (Engine Controls - Self-Diagnostics)
- Section 73 (Engine Controls - Self-Diagnostics)
- Section 74 (Engine Controls - Self-Diagnostics)
- Section 75 (Engine Controls - Trouble Shooting - No Codes)
- Section 76 (Engine Controls - System & Component Testing)
- Section 77 (Engine Controls - System & Component Testing)
- Section 78 (Engine Controls - System & Component Testing)
- Section 79 (Engine Controls - Pin Voltage Charts)
- Section 80 (Engine Controls - Sensor Operating Range Charts)
- Section 81 (Vacuum Diagrams)
- Section 82 (Engine Controls (Removal & Installation))
- Section 83 (Engine Controls - Service & Adjustment Specifications)
- Section 84 (Engine Controls - On-Vehicle Adjustments)
- Section 85 (Engine Controls - Basic Diagnostic Procedures)
- Section 86 (Engine Controls - Self-Diagnostics)
- Section 87 (Engine Controls Self-Diagnostics - Pathfinder)
- Section 88 (Engine Controls - Trouble Shooting - No Codes)
- Section 89 (Engine Controls - System & Component Testing)
- Section 90 (Engine Controls - Pin Voltage Charts)
- Section 91 (Vacuum Diagrams)
- Section 92 (Engine Controls - Self-Diagnostics (QG18DE))
- Section 93 (Multiplex Communication System)
- Section 94 (Engine Immobilizer System)
- Section 95 (Anti-Theft Systems)
- Section 96 (Remote Keyless Entry Systems)
- Section 97 (Power Mirrors)
- Section 98 (Power Seats)
- Section 99 (Cruise Control Systems)
- Section 100 (Instrument Panel)
- Section 101 (Steering Column Switches)
- Section 102 (Wiper/Washer Systems)
- Section 103 (Automatic Headlights)
- Section 104 (Power Moon Roofs)
- Section 105 (Anti-Lock)
- Section 106 (Anti-Lock)
- Section 107 (Multiplex Communication System)
- Section 108 (Body Control System)
- Section 109 (Instrument Panel)
- Section 110 (Steering Column Switches)
- Section 111 (Automatic Headlights & Lighting)
- Section 112 (Wiper/Washer Systems)
- Section 113 (Power & Heated Seats)
- Section 114 (Moon Roof)
- Section 115 (Power Windows)
- Section 116 (Power Door Locks & Liftgate)
- Section 117 (Anti-Theft System)
- Section 118 (Remote Keyless Entry)
- Section 119 (Engine Immobilizer)
- Section 120 (Cruise Control)
- Section 121 (Instrument Panel Diagnosis & Testing)
- Section 122 (Anti-Lock Brake System)
- Section 123 (Rear Window Defogger)
- Section 124 (Power Windows)
- Section 125 (Electronic Suspension)
- Section 126 (Smart Entrance Control Unit)
- Section 127 (Anti-Theft System)
- Section 128 (Power Door Locks)
- Section 129 (Remote Keyless Entry System)
- Section 130 (Instrument Panel)
- Section 131 (Engine Immobilizer System - Diagnosis)
- Section 132 (Fuses & Circuit Breakers)
- Section 133 (Servicing A/T)
- Section 134 (Front Suspension)
- Section 135 (Wheel Alignment Specifications & Adjustment Procedures)
- Section 136 (Timing Belt Replacement - 4.3L V8)
- Section 137 (Computer Relearn Procedures)
- Section 138 (Computer Relearn Procedures)
- Section 139 (Engine Controls - Self-Diagnostics)
- Section 140 (Engine Controls - System & Component Testing)
- Section 141 (System Wiring Diagrams)
- Section 142 (System Wiring Diagrams)
- Section 143 (System Wiring Diagrams)
- Section 144 (Engine Controls Removal & Installation)
- Section 145 (System Wiring Diagrams)
- Section 146 (System Wiring Diagrams)
- Section 147 (System Wiring Diagrams)
- Section 148 (System Wiring Diagrams)
- Section 149 (System Wiring Diagrams)
- Section 150 (Engine Mechanical)
- Section 151 (Engine Mechanical)
- Section 152 (Engine Controls - Removal & Installation)
- Section 153 (Engine Controls - Removal & Installation)
- Section 154 (Engine Controls - Removal & Installation)
- Section 155 (Air Bag Restraint Systems)
- Section 156 (Air Bag Restraint Systems)
- Section 157 (Air Bag Restraint Systems)
- Section 158 (Air Bag Restraint Systems)
- Section 159 (Common Specs & Procedures)
- Section 160 (Computer Relearn Procedures)
- Section 161 (Specifications & Procedures)
- Section 162 (Wheel Alignment Specifications & Procedures)
- Section 163 (Wheel Alignment Specifications & Adjustment Procedures)
- Section 164 (Wheel Alignment Specifications & Procedures)
- Section 165 (Wheel Alignment Specifications & Adjustment Procedures)
- Section 166 (Brakes Mechanical)
- Section 167 (Electrical Component Locator)
- Section 168 (Computer Relearn Procedures)
- Section 169 (Disc & Drum)
- Section 170 (Electric Cooling Fans)
- Section 171 (Engine Mechanical)
- Section 172 (Axle Shafts - Front)
- Section 173 (Axle Shafts)
- Section 174 (Charging System - Generators & Regulators)
- Section 175 (Front Suspension)
- Section 176 (Front Suspension)
- Section 177 (Cooling System Specifications & Drive Belt Routing)
- Section 178 (Fuses & Circuit Breakers)
- Section 179 (Rear Suspension)
- Section 180 (Rear Suspension)
- Section 181 (System Wiring Diagrams)
- Section 182 (System Wiring Diagrams)
- Section 183 (System Wiring Diagrams)
- Section 184 (System Wiring Diagrams)
- Section 185 (Generators & Regulators)
- Section 186 (Automatic Transmission Servicing)
- Section 187 (Automatic Transmission Servicing)
- Section 188 (Generators & Regulators)
- Section 189 (Generators & Regulators)
- Section 190 (Servicing)
- Section 191 (Starting System)
- Section 192 (Starters)
- Section 193 (Air Bag Restraint Systems)
- Section 194 (Air Bag Restraint Systems)
- Section 195 (Air Bag Restraint Systems)
- Section 196 (Diagnosis)
- Section 197 (Automatic Air Conditioner)
- Section 198 (Overhaul)
- Section 199 (Removal & Installation)
- Section 200 (Accelerator Control System)
- Section 201 (Engine Control System)
- Section 202 (Instrument Panel)
- Section 203 (Driver Information System)
- Section 204 (Brake Control System)
- Section 205 (Engine Cooling System)
- Section 206 (Fuel System)
- Section 207 (Power Steering System)
- Section 208 (Propeller Shaft)
- Section 209 (Rear Final Drive)
- Section 210 (Electronic Key System)
- Section 211 (Engine Mechanical - 2.5L)
- Section 212 (Engine Mechanical - 3.5L)
- Section 213 (General Information)
- Section 214 (Can)
- Section 215 (General Information)
- Section 216 (Engine Lubrication System)
- Section 217 (Seat Belts)
- Section 218 (Hood)
- Section 219 (IVIS (INFINITI Vehicle Immobilizer System-NATS))
- Section 220 (Rear Window Defogger)
- Section 221 (Headlamp (For USA))
- Section 222 (Air Conditioning)
- Section 223 (Propeller Shaft)
- Section 224 (Steering System)
- Section 225 (Power Tilt And Power Telescopic Steering Column)
- Section 226 (Air Conditioning System)
- Section 227 (Abs)
- Section 228 (Alignment Specifications & Procedures)
- Section 229 (General Information)
- Section 230 (Engine Lubrication System - 2.5L)
- Section 231 (Engine Cooling System - 2.5L)
- Section 232 (Exhaust System - 2.5L)
- Section 233 (Clutch)
- Section 234 (Manual Transmission)
- Section 235 (Automatic Transmission)
- Section 236 (Road Wheels & Tires)
- Section 237 (Power Steering Gear And Linkage)
- Section 238 (Seat Belt System)
- Section 239 (Power Door Lock System)
- Section 240 (Remote Keyless Entry System)
- Section 241 (Trunk Lid Opener)
- Section 242 (Power Window System)
- Section 243 (Rear Window Defogger)
- Section 244 (Sun Roof)
- Section 245 (Exterior Trim & Interior Trim)
- Section 246 (Instrument Panel)
- Section 247 (Seat System)
- Section 248 (Automatic Air Conditioner)
- Section 249 (Power Supply Routing Circuit)
- Section 250 (IPDM E/R (Intelligent Power Distribution Module Engine Room))
- Section 251 (Ground Circuit)
- Section 252 (Combination Meters)
- Section 253 (Warning System - Warning Lamps)
- Section 254 (BCM (Body Control Module))
- Section 255 (Can System)
- Section 256 (Audio System, Visual System & Telephone System)
- Section 257 (Manual Air Conditioner)
- Section 258 (General Information)
- Section 259 (Engine Mechanical)
- Section 260 (Engine Cooling System)
- Section 261 (Exhaust System)
- Section 262 (Clutch System)
- Section 263 (Manual Transaxle)
- Section 264 (Transfer Case - ATX14A)
- Section 265 (Driveshaft)
- Section 266 (Front Final Drive)
- Section 267 (Abs)
- Section 268 (Body & Trim)
- Section 269 (Harness Connector)
- Section 270 (Power Supply Routing)
- Section 271 (Headlamp (For USA))
- Section 272 (Headlamp (For CANADA) Daytime Light System)
- Section 273 (Parking License & Tail Lamps)
- Section 274 (Meters And Gauges)
- Section 275 (Warning System - Warning Lamps)
- Section 276 (Audio System)
- Section 277 (Power Sunroof)
- Section 278 (Vehicle Security (Theft Warning) System)
- Section 279 (Can Communication)
- Section 280 (Wiper System & Washer System & Horn System)
- Section 281 (Automatic Transmission)
- Section 282 (Engine Lubrication System - 3.5L)
- Section 283 (Engine Cooling System - 3.5L)
- Section 284 (Exhaust System - 3.5L)
- Section 285 (Anti-Lock Brake System & Traction Control System - Abs/TCS)
- Section 286 (Standard Bolt)
- Section 287 (Automatic Transmission (Service Specifications))
- Section 288 (Engine Control System - Diagnosis)
- Section 289 (Electronic Modulated Suspension - Diagnosis)
- Section 290 (Abs W/ EBD - Diagnosis)
- Section 291 (Abs W/EBD & BA & TRAC & VSC System - Diagnosis)
- Section 292 (Automatic Transaxle - Diagnosis)
- Section 293 (Air Conditioning System - Diagnosis)
- Section 294 (Lighting System - Diagnosis)
- Section 295 (Wiper & Washer - Diagnosis)
- Section 296 (Audio System - Diagnosis)
- Section 297 (Power Window Control System - Diagnostics)
- Section 298 (Power Mirror Control System - Diagnosis)
- Section 299 (Combination Meter - Diagnosis)
- Section 300 (Front Power Seat Control System (With Memory) - Diagnosis)
- Section 301 (Power Door Lock - Diagnosis)
- Section 302 (Wireless Door Lock - Diagnosis)
- Section 303 (Luggage Compartment Door Opener System - Diagnosis)
- Section 304 (Key Unlock Warning System - Diagnosis)
- Section 305 (Engine Immobilizer System - Diagnosis)
- Section 306 (Theft Deterrent System - Diagnosis)
- Section 307 (Multiplex Communication System - Diagnosis)
- Section 308 (Can Communication System - Diagnosis)
- Section 309 (Cruise Control System - Diagnosis)
- Section 310 (Engine Control System)
- Section 311 (Fuel System)
- Section 312 (Emission Control System)
- Section 313 (Intake Air Control System)
- Section 314 (Engine (Mechanical))
- Section 315 (Engine Exhaust Assembly)
- Section 316 (Cooling System)
- Section 317 (Lubrication System)
- Section 318 (Ignition System)
- Section 319 (Wheel Alignment)
- Section 320 (Abs Brake Sensors/Actuators)
- Section 321 (Automatic Transaxle (On-Vehicle Service))
- Section 322 (Steering Column)
- Section 323 (Power Steering)
- Section 324 (Heater & Air Conditioner)
- Section 325 (Instrument Panel/Meter)
- Section 326 (Theft Deterrent Systems)
- Section 327 (Sliding Roof System)
- Section 328 (Cruise Control)
- Section 329 (Engine Hood/Door (Service Specifications))
- Section 330 (Steering Column)
- Section 331 (Headlight Dimmer Switch)
- Section 332 (Audio & Visual System)
- Section 333 (Instrument Panel/Meter)
- Section 334 (Rear Seat)
- Section 335 (Front Door)
- Section 336 (Rear Door)
- Section 337 (Introduction)
- Section 338 (Automatic Transmission (Service Specifications))
- Section 339 (Automatic Transmission - Diagnosis)
- Section 340 (Power Tilt & Telescopic Steering Column - Diagnosis)
- Section 341 (Power Seat Control System - Diagnosis)
- Section 342 (Rear Left Seat Control System - Diagnosis)
- Section 343 (Rear Right Seat Control System - Diagnosis)
- Section 344 (Rear Seat Switch System - Diagnosis)
- Section 345 (Theft Deterrent System - Diagnosis)
- Section 346 (Cruise Control System - Diagnosis)
- Section 347 (Engine Immobilizer System - Diagnosis)
- Section 348 (Combination Meter System - Diagnosis)
- Section 349 (Combination Switch Control System - Diagnosis)
- Section 350 (Steering Pad Switch System - Diagnosis)
- Section 351 (Rain Sensor System - Diagnosis)
- Section 352 (Sliding Roof - Diagnosis)
- Section 353 (Driver Side Junction Block (Body No. 2 Control System) - Diagnosis)
- Section 354 (Passenger Side Junction Block (Body No. 3 ) Control System - Diagnosis)
- Section 355 (Luggage Room Junction Block (Body No. 4) Control System - Diagnosis)
- Section 356 (Front Light (Body No. 5) Control System - Diagnosis)
- Section 357 (Driver Door Control System - Diagnosis)
- Section 358 (Passenger Door Control System - Diagnosis)
- Section 359 (Rear Left Door Control System - Diagnosis)
- Section 360 (Rear Right Door Control System - Diagnosis)
- Section 361 (Gateway System - Diagnosis)
- Section 362 (Audio System - Diagnosis)
- Section 363 (LEXUS Navigation System - Diagnosis)
- Section 364 (LEXUS Link System - Diagnosis)
- Section 365 (LEXUS Park Assist System - Diagnosis)
- Section 366 (Air Conditioning System - Diagnosis)
- Section 367 (Troubleshooting)
- Section 368 (Power Source)
- Section 369 (Ignition Switch & Key Unlock Warning Switch)
- Section 370 (Headlight & Taillight System)
- Section 371 (Headlight Beam Level Control System)
- Section 372 (Fog Light System)
- Section 373 (Turn Signal & Hazard Warning System)
- Section 374 (Illumination Light System)
- Section 375 (Interior Light System)
- Section 376 (Stop Light System)
- Section 377 (Headlight Cleaner System)
- Section 378 (Wiper & Washer System)
- Section 379 (Combination Meter)
- Section 380 (Defogger System)
- Section 381 (Power Window Control System)
- Section 382 (Power Door Lock Control System)
- Section 383 (Wireless Door Lock Control System)
- Section 384 (Power Seat Control System)
- Section 385 (Power Mirror Control System)
- Section 386 (Power Shoulder Belt Anchorage System)
- Section 387 (Electro Chromic Mirror System)
- Section 388 (Climate Control Seat System)
- Section 389 (Fuel Lid Opener System)
- Section 390 (Door Closer System)
- Section 391 (Luggage Compartment Door Closer System)
- Section 392 (LEXUS Park Assist System)
- Section 393 (Rear Sunshade System)
- Section 394 (Clock)
- Section 395 (Overhead Junction Block)
- Section 396 (Garage Door Opener System)
- Section 397 (Horn System)
- Section 398 (Sliding Roof - Removal & Installation)
- Section 399 (Instrument Panel)
- Section 400 (Rear Seat (Fixed Type))
- Section 401 (Rear Seat (Power Adjuster Type))
- Section 402 (Seat Belt)
- Section 403 (Seat Belt PRETENSIONER (Front))
- Section 404 (Seat Belt PRETENSIONER (Rear))
- Section 405 (Seat Heater System)
- Section 406 (Fuel System)
- Section 407 (Starting System)
- Section 408 (Charging System)
- Section 409 (Seat Belt System)
- Section 410 (Shift Lock System)
- Section 411 (O/D Direct Clutch Speed Sensor)
- Section 412 (ATF Oil Temperature Sensor)
- Section 413 (Automatic Transmission Unit (Removal & Installation))
- Section 414 (Front Axle)
- Section 415 (Introduction)
- Section 416 (Tire & Wheel)
- Section 417 (Seat Belt)
- Section 418 (Lighting)
- Section 419 (Power Window Control System)
- Section 420 (Mirrors)
- Section 421 (Seats)
- Section 422 (Doors)
- Section 423 (Bumpers)
- Section 424 (Exhaust System)
- Section 425 (Engine Exhaust Assembly)
- Section 426 (Exterior/Interior Trim)
- Section 427 (Firing Order & Cylinder Identification)
Factory Service Tools
Use the Manual With the Right Hardware
Pair factory procedures with proven DIY tools so the instructions are easier to execute.
Disclosure: Verified tool recommendations may earn an affiliate commission at no cost to you.
When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- β’ You smell fuel, burning insulation, or see smoke.
- β’ Brakes feel soft, pull hard to one side, or make grinding noises.
- β’ The engine overheats, stalls repeatedly, or misfires under load.
- β’ You are missing required tools, torque specs, or safe lifting equipment.
- β’ You are not confident in the next step or safety outcome.
Rather have a pro handle this?
A certified mobile mechanic comes to your home or office. They bring the tools, you stay comfortable. No tow truck, no waiting room, no surprises.
Comes to youSame-day available12-month warranty
Get a Free QuoteNo obligation. See pricing before you book.
