Automotive and Commercial Locksmith: The "THEFT" Light on Ford product.

Theft (Security) light:

Contains many clue's when programming keys into the system. The key must be turned ON.

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A Fast Blinking THEFT light will indicate that the vehicle is in ANTI-SCAN Mode or a un-programmed key has been turned ON.

THEFT (Solid for 3 seconds)
A solid lit THEFT light for 3 seconds and then goes out completely will indicate the vehicle recognizes a programmed key.

THEFT (Stays on solid)
A solid lit THEFT light that stays ON and does not blink or go out indicates that the vehicle is in Learn Mode and is waiting for a second key to be programmed, simply insert another key to be programmed and turned ON.

In some cases, inserting a second key will do no good if the vehicle is equipped with a after-market Remote Start device. You must disconnect the Remote Start device to finish key programming.