25
PATS transponders, as well as Lexus and Toyotas, 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.
bypassing GM vehicle anti-theft systems (VATS)
Vehicles with the GM VATS (Pass Key) systems have a resistor embedded in the ignition key. If the
VATS decoder module does not measure the proper resistance when the vehicle is started, the starter
and fuel pump may be disabled for up to ten minutes. An optional "VATS pack" of resistors is avail-
able. One of the resistors in the pack will match the resistor in the key.
The VATS wires will be two very light-gauge wires coming out of the steering column. The colors of
the wires vary, but they are often contained in orange or gray tubing - either both will be white wires,
or one wire will be purple/white and the other white/black. Determine the value of the resistor in
the key. Then follow the diagram below to bypass VATS during remote start operation. If the 3/1
BLUE status output has been programmed for factory security re-arm, use the H3/2 BLUE/BLACK
third ignition output to control the relay.
NNOOTTEE::
When connecting to the VATS wires, it is not important which wire is cut.
H3/1 BLUE OR
H3/2 BLUE/BLACK
(+) 12V CONSTANT FUSED
85
86
30
87
87A
DIA-621
TO IGNITION KEY SWITCH
X
X
CUT
PROPER RESISTOR VALUE
TO VATS DECODER MODULE
WHITE OR WHITE/BLACK
WHITE OR PURPLE/WHITE
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