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
Control Units
CONTROL UNITS LOCATION
| Component | Component Location |
|---|---|
| A/C Auto Amplifier | Behind right side of dash. See Figure . |
| Active Damper Suspension Control Unit | Behind left rear shock tower. See Figure . |
| Air Bag Diagnosis Sensor Unit | Under rear of center console. See Figure . |
| ASCD Control Unit | Behind dash, left of steering column. See Figure . |
| AV Control Unit (W/O NAVI) | Behind center of dash. See Figure . |
| AV & NAVI Control Unit (W/NAVI) | Under left side of rear parcel shelf. See Figure . |
| Body Control Module | Behind left kick panel. See Figure . |
| Driver's Seat Control Unit | Under driver's seat. See Figure . |
| Dual Mode Muffler Control Unit | At right side of trunk. See Figure . |
| Engine Control Module | Behind glove box. See Figure . |
| Fuel Pump Control Module | At right side of trunk. See Figure . |
| Headlamp Battery Saver Control Unit | Behind dash, left of steering column. See Figure . |
| ICC Unit | At right side of trunk. See Figure . |
| Low Tire Pressure Warning Control Unit | Behind center of dash. See Figure . |
| NATS IMMU | Behind dash, left of steering column. See Figure . |
| Power Steering Control Unit | Behind dash, right side of center console. See Figure . |
| Rear Power Seat Control Unit (Left & Right) | Under respective rear seat. |
| Rear View Camera Control Unit | At center front of trunk. See Figure . |
| Shift Lock Control Unit | Behind dash, left of steering column. See Figure . |
| Steering Lock Control Unit | Behind dash, right of steering column. See Figure . |
| Transmission Control Module | Behind glove box. See Figure . |
| Trunk Closure Control Unit | At center rear of trunk. See Figure . |
| VDC/TCS/ABS Control Unit | Behind right kick panel. See Figure . |
| Voice Activated Control Module | Left rear of trunk. See Figure . |
Factory Service Tools
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.