Programming instructions

130
UNGO – Application Notes / Terms
Voltage sensing is not recommended in areas
that experience extreme cold temperatures. The
resistance in the vehicles wiring increases which
can cause intermittent remote start reliability.
454T: Alternator RPM Monitor
The 454T Alternator RPM Monitor is for use with
remote engine starts as an alternative to direct
connection to the vehicle’s tachometer or fuel
injector wire. It detects electrical spikes in the
vehicles electrical system and converts them into
an output that simulates a tachometer.
Remote Start Terms and
Definitions
Immobilizer (a.k.a.: Transponder)
The Immobilizer uses an antenna ring around the
ignition cylinder to energize a small transponder
chip hidden in the ignition key. When the ignition is
turned on, the chip is energized and the antenna
rings sends the code to the Immobilizer control
unit. The vehicle will only start if the code matches
the one programmed into the vehicle.
Passkey/VATS
The Passkey/VATS system consists of four parts:
the Passkey cylinder, the ignition switch, the
instrument cluster panel (IPC), and the power train
control module (PCM). The system requires that
the key cylinder be mechanically turned using a
key. When the key cylinder is properly turned, it
generates a resistance code (R-Code), which is
sent to the IPC. The vehicle will only start if the
R-Codes match the key and key cylinder.
Passlock 2
The Passlock 2 system must see the correct
resistance code at the correct time. When the
ignition switch is turned to the crank position, the
“Bulb Check” wire is switched to ground. This
starts a time window during which the instrument
cluster panel (IPC) analyzes the resistance code
(R-Code). If the R-Code is valid and is received
in the proper window of time, the IPC sends a
code via data bus to the PCM to enable the fuel
injection system. If the key cylinder itself is pulled
out or damaged, it will not generate the resistance
code and the vehicle will not run.
Passkey 3
The Immobilizer uses an antenna ring around the
ignition cylinder to energize a small transponder
chip hidden in the ignition key. When the ignition is
turned on, the chip is energized and the antenna
rings sends the code to the Immobilizer control
unit. If the code is incorrect the vehicle will not
start.
PATS
Passive Anti-Theft System (PATS) uses a specially
programmed key to start the vehicle, similar to the
Immobilizer. It uses an antenna ring around the
ignition cylinder to energize a small transponder
chip hidden in the ignition key. When the ignition is
turned on, the chip is energized and the antenna
ring sends the code to the PATS control unit. If the
code is incorrect the vehicle will not start.
Resistor
One of the components necessary in interface with
VATS factory anti-theft systems. A resistor(s) are
used in conjunction to reproduce the resistance
code (R-Code) embedded in the vehicle’s key