[shorod]

You are seeing a Lamp Fault Code of 18, per the service manual:

The air bag electronic crash sensor (ECS) module supports features which are not used in Taurus/Sable vehicles. The wiring harness pins used by the ECS for these features are normally left disconnected in Taurus/Sable vehicles. If the ECS detects a connection to Pin 3, 4, 5, 6, 8, 9, 10, 11, 16, 18, 20, 23, 24, 25, 26 or 27, it will store a diagnostic trouble code (DTC) B1871, B1877, B1878, B1879, B1881, B1882, B1883, B1884, B1885, B1886, B1889, B1890, B1901 or B1941 in memory and flash a lamp fault code (LFC) 14, 17, 18, 25, 27, 41, 46 or 47.


Possible Causes

An unexpected feature present could be caused by:

l a wiring harness fault causing connection to a normally unused ECS pin.

l an internal ECS module fault.

-Rod