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.
2002 Nissan-Datsun Sentra SE-R, AutomaticFACTORY OEM SERVICE PROCEDURE
Smart Entrance Control Unit: Description: Input/Output
INPUT/OUTPUT
| System | Input | Output |
|---|---|---|
| Power door lock | Door lock and unlock switch, LH and RH Key switch (insert), Door switches, Door key cylinder switch | Door lock actuator |
| Remote keyless entry | Keyswitch (insert), Ignition switch (ACC), Door Switches, Front Door Unlock sensor, LH Keyfob signal | Vehicle security lamp relay, Vehicle Security Horn relay, Interior lamp, Remote Keyless entry Relay, Door lock Actuator, Trunk lid opener actuator |
| Warning chime | Key switch (insert), Ignition switch (ON), Lighting switch (1st or 2nd), Seat belt buckle switch, LH Front door switch LH | Warning chime (located in smart entrance control unit) |
| Rear window defogger and door mirror defogger | Ignition switch (ON), Rear window defogger switch | Rear window defogger relay |
| Vehicle security | Ignition switch (ACC, ON), Door switches, Hood switch, Door lock/unlock switches, Trunk lid key cylinder switch (unlock), Door unlock sensors | Vehicle security lamp relay, Horn relay, Horn relay Security indicator lamp |
| Interior lamp | Door switches, Front door unlock sensor, LH Ignition switch (ON), Key switch (Insert) | Interior lamp |
| Battery saver control for interior lamp/map, lamp/vanity lamps | Ignition switch (ON), Door switches, Lamp switches, Main Power Window and door lock/unlock switch | Interior lamp, Map lamp, Vanity lamps |
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.
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