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.
2004 Infiniti M45FACTORY OEM SERVICE PROCEDURE
Control Units
CONTROL UNITS LOCATION
| Component | Location |
|---|---|
| A/C Auto Amp. | Behind right side of dash, near blower motor. See Figure . |
| ASCD Control Unit | Behind dash, left of steering column. See Figure . |
| A/T Device (M97) | Under center console. See Figure . |
| AV Control Unit | Behind center of dash. See Figure . |
| AV & NAVI Control Unit | At front center of luggage compartment. See Figure . |
| BCM | Behind left kick panel. See Figure . |
| Daytime Light Control Unit (For Canada) | At left front corner of engine compartment. See Figure . |
| Driver's Seat Control Unit (LCU02) (B142) | Under driver's seat. See Figure . |
| Dual Mode Muffler Control Unit | At right side of luggage compartment. See Figure . |
| ECM | Behind glove box. See Figure . |
| Front Left Side Air Bag Module (B14) | Under left front seat. See Figure . |
| Front Passenger Air Bag Module (M121) | Behind right side of dash. See Figure . |
| Front Right Side Air Bag Module (B214) | Under right front seat. See Figure . |
| Fuel Pump Control Module (FPCM) | On right side of luggage compartment. See Figure . |
| Headlamp Battery Saver Control Unit | Behind left side of dash. See Figure . |
| ICC Unit | On right side of luggage compartment. See Figure . |
| Left Side Curtain Air Bag Module (B24) | At base of left "C" pillar. See Figure . |
| Low Tire Pressure Warning Control Unit (M84) | Behind center of dash. See Figure . |
| NATS IMMU | Behind dash, left of steering column. See Figure . |
| Power Steering Control Unit | Behind right side of dash. See Figure . |
| Right Side Curtain Air Bag Module (B224) | At base of right "C" pillar. See Figure . |
| Shift Lock Control Unit | Behind left side of dash. See Figure . |
| Steering Lock Control Unit | Behind center of dash. See Figure . |
| TCM (Transmission Control Module) | Behind glove box. See Figure . |
| Trunk Closure Control Unit | At rear center of luggage compartment. See Figure . |
| VDC/TCS/ABS Control Unit | Behind right kick panel. See Figure . |
| Voice Activated Control Module | Left rear of luggage compartment. See Figure . |
Factory Service Tools
Use the Manual With the Right Hardware
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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.
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