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

Conditions Of Vehicle (Operating Conditions)

WARNING: This page is about a different car, the 2012 Nissan Pathfinder. However, it is still accessible from the selected car via links, so may be relevant.

Engine start function is ON when setting on CONSULT.
Mechanical key is not inserted in key cylinder.
One or more of Intelligent Keys with registered Intelligent Key ID is in the vehicle.

Symptom	Diagnosis/service procedure	Refer to
Ignition switch does not turn on with Intelligent Key. [green "KEY" lamp is displayed]	1. Check steering lock solenoid.	B2013 ID DISCORD I-KEY-STRG
	2. Replace Intelligent Key unit.	INTELLIGENT KEY UNIT
Ignition switch does not turn on with Intelligent Key. ["KEY" lamp does not display]	1. Check Intelligent Key unit power supply and ground circuit.	POWER SUPPLY AND GROUND CIRCUIT
	2. Check ignition knob switch.	IGNITION KNOB SWITCH
	3. Check key switch (BCM input).	KEY SWITCH (BCM INPUT)
	4. Check key switch (Intelligent Key unit input).	KEY SWITCH (INTELLIGENT KEY UNIT INPUT)
	5. Replace Intelligent Key unit.	INTELLIGENT KEY UNIT
	6. Check green "KEY" indicator.	WARNING LAMP
	7. Check red "KEY" indicator.	WARNING LAMP
Ignition switch does not turn on with Intelligent Key. [red "KEY" lamp is displayed]	1a. Check inside key antenna 1 (instrument panel).	INSTRUMENT PANEL AREA ANTENNA
	1b. Check inside key antenna 2 (luggage compartment).	CENTER CONSOLE AREA ANTENNA
	1c. Check inside key antenna 3 (center console).	LUGGAGE AREA ANTENNA
	2. Replace Intelligent Key unit.	INTELLIGENT KEY UNIT
Ignition switch does not turn on with mechanical key	1. Check key switch (BCM input).	KEY SWITCH (BCM INPUT)
Ignition switch does not turn on with mechanical key	2. Check key switch (Intelligent Key unit input).	KEY SWITCH (INTELLIGENT KEY UNIT INPUT)
Engine cannot be cranked with transmission in "Park" or in "Neutral" position with brake pedal depressed	1. Check transmission signal.	P0705 TRANSMISSION RANGE SENSOR A
	2. Check stop lamp switch.	WIRING DIAGRAM
"P-SHIFT" indicator does not operate properly	1. Check "P-SHIFT" indicator.	WARNING LAMP

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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