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 MANUALSFORD2005TAURUS SEL, 4D SEDANREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 1212 (EXTERIOR LIGHTING SYSTEM)DIAGNOSIS AND TESTINGHEADLAMPSSYMPTOM TABLE

2005 Ford Taurus SEL, 4D Sedan

Symptom Table

2005 Ford Taurus SEL, 4D SedanSECTION Symptom Table

WARNING: This page is about a different car, the 2010 Mercury Milan, 2010 Lincoln MKZ, and 2010 Ford Fusion. However, it is still accessible from the selected car via links, so may be relevant.

SYMPTOM TABLE

Condition	Possible Sources	Action
Both low beams are inoperative	Smart Junction Box (SJB)	VERIFY the bulbs are OK. If OK, Go To PINPOINT TEST B .
The low beams turn on after a 5 second delay when the headlamp switch is placed in the HEADLAMPS ON position	Wiring, terminals or connectors Headlamp switch SJB	Go To PINPOINT TEST D .
Both high beams are inoperative	Fuse Wiring, terminals or connectors Multifunction switch SJB	VERIFY the bulbs are OK. If OK, Go To PINPOINT TEST A .
One low beam headlamp is inoperative	Fuse Wiring, terminals or connectors Headlamp relay Ballast High Intensity Discharge (HID) bulb Headlamp assembly SJB	VERIFY the bulb is OK. If OK, Go To PINPOINT TEST B .
One high beam headlamp is inoperative	Wiring, terminals or connectors Headlamp assembly	VERIFY the bulb is OK. If OK, Go To PINPOINT TEST C .
The low beam(s) are always on	Wiring, terminals or connectors Headlamp relay Headlamp switch SJB	Go To PINPOINT TEST D .
The high beam(s) are always on	Wiring, terminals or connectors Multifunction switch SJB	Go To PINPOINT TEST E .
The flash-to-pass feature is inoperative	Wiring, terminals or connectors Multifunction switch SJB	Go To PINPOINT TEST F .

RENDER: 1.0x

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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.