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Remote Engine Start Neutral Safety Switch Bulletin
A neutral safety switch is a mechanism on almost every vehicle equipped
with an automatic transmission. The neutral safety switch prevents the
vehicle from starting while the gear shift selector is in "Reverse" or
"Forward" gear positions.
There are basically two types of neutral safety switches. The most common
is the mechanical (separate) neutral safety switch. A small group of
vehicles use a combined neutral safety switch.
Type "A" (separate)
The mechanical neutral safety switch is located between the ignition
switch and the starter solenoid. The starter wire runs directly from the back
of the ignition switch to the neutral safety switch and then to the starter
solenoid. When adding a remote engine starter, make starter wire
connections as close to the ignition switch as possible to ensure your
connections are between the ignition switch and the neutral safety switch.
Type "B" (combined)
Some vehicles combine the neutral safety switch and the steering column
shift mechanism together. The starter wires run from the combined switch
directly to the starter solenoid. The remote start wire connection cannot be
made between the ignition switch and the neutral safety switch. As a
result, if the vehicle was left in gear with the key in the ignition and not in
the locked position, the vehicle could move forward or backward if a
remote start attempt was made.
The combined type neutral safety switch requires an additional relay to
prevent the vehicle from remote starting while the key is in the ignition.
Use the attached test procedure and relay wiring diagrams. Install the
complete remote start unit and test all safety features before conducting the
test procedure.
Currently, the only vehicles with the combined neutral safety switch that
Avital is aware of are General Motors trucks, GM sport utility vehicles, GM
column shift passenger cars and Dodge Dakota pickup trucks. There may
be additional vehicles with the combined neutral safety switch that require
the additional relay.
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AviStart 4001 Installation Manual
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