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.

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HOMESERVICE MANUALSFORD2010MUSTANG BASE, 2D COUPE, AUTOMATICREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 417 (INTERIOR LIGHTING SYSTEM)DIAGNOSIS AND TESTINGINTERIOR LIGHTINGSYMPTOM CHART

2010 Ford Mustang Base, 2D Coupe, Automatic

Symptom Chart

2010 Ford Mustang Base, 2D Coupe, AutomaticSECTION Symptom Chart

WARNING: This page is about a different car, the 2006 Mercury Mariner and 2006 Ford Escape. However, it is still accessible from the selected car via links, so may be relevant.

SYMPTOM CHART

Condition	Possible Sources	Action
No communication with the smart junction box (SJB)	Circuitry SJB	REFER to MULTIFUNCTION ELECTRONIC MODULES .
The interior lamps are inoperative	Fuse Circuitry SJB	GO to PINPOINT TEST A .
The interior lamps stay on continuously	Circuitry Door ajar switch(es) Liftgate ajar switch Liftgate glass ajar switch SJB	GO to PINPOINT TEST B .
The interior lamps do not turn on with one door open	Circuitry Door ajar switch SJB	GO to PINPOINT TEST C .
An individual demand lamp is inoperative	Circuitry Lamp assembly	GO to PINPOINT TEST D .
An individual interior lamp is inoperative	Circuitry Interior lamp Cargo lamp	GO to PINPOINT TEST E .
The illuminated entry is inoperative when using the remote keyless entry (RKE) transmitter/keypad	RKE system SJB	GO to PINPOINT TEST F .
The battery saver does not deactivate after time-out	SJB	INSTALL a new SJB. REFER to MULTIFUNCTION ELECTRONIC MODULES . TEST the system for normal operation.

RENDER: 1.0x

NO RELATED

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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.