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© 2006 Directed Electronics—all rights reserved 31
ceiver will excite the transponder, which is located (but not visible) in the head of the ignition key. The key
transponder will then send a unique code back to the transceiver for evaluation. If the code matches a valid code
of the system, the vehicle will be allowed to start. Most of these transponder-based systems can be bypassed
using p/n 555U. Some may require additional parts from the vehicle manufacturer. Consult you dealer for the
applications. For most Ford PATS transponders, p/n 555F can be used, except for the following vehicles, which
will require p/n 555U: ‘97 and newer Mark VII, and 2000 and newer Taurus/Sable, Contour/Mystique and Focus.
plug-in LED and valet/program switch
These plug into the module. The Status LED plugs into the small two-pin socket, while the Valet/Program Switch
should be plugged into the larger blue two-pin connector. The Status LED fits into a
9
/32-inch hole.
Status LED Valet/Program Switch
programmer interface, 3-pin black plug
The black 3-pin port is provided for personal computer programming of the unit. The unit can also be programmed
using the Bitwriter® (p/n 998T). When using the optional PC Interface module, or hand-held programmer, it is
possible to configure any and all of the programmable functions as well as lock the Transmitter/Receiver and
System Features Learn Routines so that unauthorized users cannot change the configuration or program trans-
mitters to the unit.
When the learn routines have previously been programmed using an optional hand-held system programmer
(p/n 998T) or PC Interface module, they may have been locked. Before proceeding with reprogramming
the learn routines, they must be unlocked with either the 998T or the PC Interface module - this cannot be done
manually with the Valet switch.
DIA-41