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 Nissan-Datsun Sentra SE-RFACTORY OEM SERVICE PROCEDURE
Control Units
CONTROL UNITS LOCATION
| Component | Location |
|---|---|
| ABS Actuator & Electric Unit | At right rear of engine compartment. See Figure . |
| Air Bag Diagnosis Sensor Unit | Below center floor console. See Figure . |
| Combination Flasher Unit | Behind center of dash. See Figure . |
| Daytime Light Control Unit | Behind left kick panel. See Figure . |
| ECM (Engine Control Module) | On right side of firewall. See Figure . |
| Front Left Side Air Bag Module (B7) | Under left front seat. See Figure . |
| Front Passenger Air Bag Module (M51) | Right side of dash. See Figure . |
| Front Right Side Air Bag Module (B12) | Under right front seat. See Figure . |
| Immobilizer Control Unit | At top of steering column. See Figure . |
| Smart Entrance Control Unit | Behind center of dash. See Figure . |
| TCM (Transmission Control Module) (A/T) (1.8L SULEV) (F56, F57) | Behind right kick panel. See Figure . |
| TCM (Transmission Control Module) (A/T) (1.8L ULEV) (F56, F57) | Behind right kick panel. See Figure . |
| TCM (Transmission Control Module (2.5L) (F56, F57) | Behind right kick panel. See Figure . |
| Time Control Unit | Behind center of dash. 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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