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 1715 (INTERIOR LIGHTING SYSTEM)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 2010 Lincoln Town Car. 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 lighting control module (LCM)	Wiring, terminals or connectors LCM	REFER to MODULE COMMUNICATIONS NETWORK article.
No communication with the driver door module (DDM)	Wiring, terminals or connectors DDM	REFER to MODULE COMMUNICATIONS NETWORK article.
The courtesy lamps are inoperative	Fuse Wiring, terminals or connectors LCM	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 Instrument panel dimmer switch DDM LCM	Go to Pinpoint Test C .
The courtesy lamps stay on continuously - luggage compartment lamps	Wiring, terminals or connectors Trunk pull-down module Luggage/trunk module (LTM) LCM	Go to Pinpoint Test J .
The courtesy lamps do not turn on with one door open	Wiring, terminals or connectors Door ajar switch DDM	Go to Pinpoint Test D .
The demand lighting is inoperative	Wiring, terminals or connectors LCM	Go to Pinpoint Test E .
An individual demand lamp is inoperative	Wiring, terminals or connectors Interior lamp	Go to Pinpoint Test F .
The battery saver does not deactivate after timeout	Wiring, terminals or connectors LCM	Go to Pinpoint Test G .
The luggage compartment lamps are inoperative	Wiring, terminals or connectors Luggage lamp assembly Trunk pull-down module LTM Luggage compartment lid release solenoid/ajar switch LCM	Go to Pinpoint Test H .
The courtesy lamps are inoperative - from the instrument panel dimmer switch	Wiring, terminals or connectors Instrument panel dimmer switch LCM	Go to Pinpoint Test I .
The illuminated entry is inoperative when using the remote keyless entry (RKE) transmitter	RKE transmitter LCM	Go to Pinpoint Test K .

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.