The flashing represents a "22" code. With a scanner it will show as B1922.
According to Ford Factory Service B1922 (22)= Safing sensor output circuit shorted.
Here is what Ford lists for this code.
Pinpoint Test E: LFC 22/DTC B1922 — Safing Sensor Output Circuit Shorted to Battery Voltage
LFC 22/DTC B1922 — Safing Sensor Output Circuit Shorted to Battery Voltage
Normal Operation
The air bag diagnostic monitor (14B056) measures the voltage at C232-2, circuit 614 (GY/O), C232-3, circuit 615 (GY/W), C232-4, circuit 616 (PK/BK), and C232-5, circuit 607 (LB/O), of the air bag diagnostic monitor connector. The voltage at these pins is set by the air bag diagnostic monitor and varies with charging system voltage. The expected voltages are shown in the following table. If the air bag diagnostic monitor measures a voltage of more than five volts on any of these pins, the air bag diagnostic monitor will store in memory the diagnostic trouble code (DTC) B1922 and flash lamp fault code (LFC) 22 on the air bag indicator. Should the unexpected high voltage at C232-2, circuit 614 (GY/O), C232-3, circuit 615 (GY/W), C232-4, circuit 616 (PK/BK); or C232-5, circuit 607 (LB/O), be repaired or intermittent, the air bag diagnostic monitor will store a DTC B1922 in memory.
Possible Causes
High voltage at air bag diagnostic monitor C232-2, C232-3, C232-4 or C232-5 can be caused by:
A short to battery or ignition on circuits 607 (LB/O), C232-5, 614 (GY/O), C232-2, 615 (GY/W), C232-3, or 616 (PK/BK), C232-4 causing the diagnostic voltage to rise.
A short in the air bag sliding contact (14A664) between circuits 614 (GY/O), C232-2, or 615 (GY/W), C232-3 and some of the horn or speed control wiring.
An internal air bag diagnostic monitor failure such as a short across the normally open contacts of the safing sensor.