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 MANUALSMERCURY2009MILAN PREMIER, 3.0 1, AWDREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 1019 (INTERIOR LIGHTING)DIAGNOSTIC TESTSINTERIOR LIGHTINGSYMPTOM CHART

2009 Mercury Milan Premier, 3.0 1, AWD

Symptom Chart

2009 Mercury Milan Premier, 3.0 1, AWDSECTION Symptom Chart

WARNING: This page is about a different car, the 2008 Mercury Milan, 2008 Lincoln MKZ, and 2008 Ford Fusion. 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)	Wiring, terminals or connectors SJB	REFER to MODULE COMMUNICATIONS NETWORK article.
The courtesy lamps are inoperative	Fuse Wiring, terminals or connectors SJB	Go to Pinpoint Test A .
An individual courtesy lamp is inoperative	Wiring, terminals or connectors Interior lamp	Go to Pinpoint Test B .
The courtesy lamps stay on continuously	Wiring, terminals or connectors Door ajar switch Luggage compartment lid ajar switch Instrument panel dimmer switch SJB	Go to Pinpoint Test C .
The courtesy lamps do not turn on with one door open	Wiring, terminals or connectors Door ajar switch SJB	Go to Pinpoint Test D .
The courtesy lamps do not turn on with the luggage compartment lid open	Wiring, terminals or connectors Luggage compartment lid ajar switch SJB	Go to Pinpoint Test D .
The demand lamps are inoperative	Wiring, terminals or connectors SJB	Go to Pinpoint Test E .
An individual demand lamp is inoperative	Wiring, terminals or connectors Interior lamp	Go to Pinpoint Test F .
The illuminated entry is inoperative when using the remote keyless entry (RKE) transmitter	RKE system concern SJB	Go to Pinpoint Test G .
The battery saver does not deactivate after time-out	Wiring, terminals or connectors SJB	Go to Pinpoint Test H .
The puddle lamps are inoperative	Wiring, terminals or connectors Exterior mirror	Go to Pinpoint Test I .
The courtesy lamps are inoperative from the instrument panel dimmer switch	Dimmable back lighting illumination system concern Wiring, terminals or connectors Instrument panel dimmer switch SJB	Go to Pinpoint Test J .
The ambient lighting is inoperative	Wiring, terminals or connectors Ambient lighting switch Ambient lighting module	Go to Pinpoint Test K .
An individual ambient lighting LED is inoperative/does not operate correctly	Ambient lighting harness	NOTE: The LEDs are not serviceable separate from the harness. INSTALL a new ambient lighting harness. TEST the system for normal operation.
The ambient lighting does not cycle through all color combinations	Wiring, terminals or connectors Ambient lighting switch Ambient lighting module	Go to Pinpoint Test L .

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.