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Test ignition switch operation by rotating cylinder/key through all switch positions. Movement should feel smooth, without sticking and binding. Cylinder/key should return from START position to RUN position without assistance. Inspect and repair if necessary.
Remove instrument panel lower cover. Unplug connector from ignition switch. Connect a self-powered test light or ohmmeter between blade terminals indicated in following steps. See Fig 1 .

Fig 1: Testing Ignition Switch Continuity
Courtesy of FORD MOTOR CO.
Continuity between any blade and chassis ground should not exist in any switch position except proof circuits in START position. With ignition switch in ACC position, continuity should exist between terminals A-1 through B-5 only.
With ignition switch in LOCK and OFF positions, continuity should not exist.
With ignition switch in RUN position, continuity should exist between terminals A-1 and B-1, A-2 and B-2, A-3 and B-3, A-4 and B-4, and I-1 and B-5.
With ignition switch in START position, continuity should exist between terminals I-1 and B-5, I-2 and B-1, STA and B-4, P-1 and GND, and P-2 and GND.

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

Ignition Switch Continuity Test