WARNING: This page is about a different car, the 2005 Mercury Sable and 2005 Ford Taurus. However, it is still accessible from the selected car via links, so may be relevant.

MASTER WINDOW ADJUST SWITCH (14540) - COMPONENT TESTING

Circuit to test	Connect self-powered test light or ohmmeter to terminals	Move switch to these positions	A good switch will indicate
Switch lock	4 C504b and 1, C504b	Lock On	Closed circuit
Switch lock	4 C504b and 1, C504b	Lock Off	Open circuit
One-Touch Down Switch	4 C504b and 8, C504a	Down	Closed circuit
One-Touch Down Switch	4 C504b and 8, C504a	note	Open circuit
Left front window circuit	4 C504b and 6, C504a	Up	Closed circuit
	4 C504b and 7, C504a	Down	Closed circuit
	2 C504b and 6, C504a	Rest	Closed circuit
	2 C504b and 7, C504a	Rest	Closed circuit
Right front window circuit	4 C504b and 4, C504a	Up	Closed circuit
	4 C504b and 3, C504a	Down	Closed circuit
	2 C504b and 4, C504a	Rest	Closed circuit
	2 C504b and 3, C504a	Rest	Closed circuit
Left rear window circuit	4 C504b and 5, C504b	Up	Closed circuit
	4 C504b and 6, C504b	Down	Closed circuit
	2 C504b and 5, C504b	Rest	Closed circuit
	2 C504b and 6, C504b	Rest	Closed circuit
Right rear window circuit	4 C504b and 3, C504b	Up	Closed circuit
	4 C504b and 2, C504a	Down
	2 C504b and 3, C504b	Rest	Closed circuit
	2 C504b and 2, C504a	Rest	Closed circuit

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.

Safety Warning

Component Testing Procedure

Use the Manual With the Right Hardware

When to See a Mechanic

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