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 value 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 available (Directed P/N 652T). 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 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 wiring outlined in the following diagram to bypass VATS during remote start
operation. If the BLUE status output has been programmed for factory security re-arm, use the
H2/2 BLUE/BLACK third ignition output to control the relay.
NOTE: When connecting to the VATS wires, it is not important which wire is cut.
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