Neutral Safety Switch Interface - Viper Responder LE 5701 Installation Manual

Neutral safety switch interface

Some vehicles do not have an electrical neutral safety switch. Instead, the ve-
hicle has a mechanical neutral safety switch that physically interrupts the starter
wire and is used when the vehicle is in any drive gear. If the remote start is
interfaced before this switch, it will provide protection from starting in gear.
However, some vehicles combine the column shift mechanism and the mechani-
cal neutral safety switch into one mechanical part.
In these vehicles, you cannot interface the remote start system before the neutral
safety switch; it needs to be interfaced differently. With this type of vehicle, if
the car is left in a drive gear and the remote start system is activated, the vehicle
will move and may cause damage to persons or property.
According to available information, the only vehicles currently manufactured this
way are most General Motors trucks, sport utility vehicles and column shifting
passenger cars. Available information also indicates that pre-1996 Dodge Dakota
pickups with 2.5 liter motors are manufactured this way as well.
GM vehicles that have the neutral safety switch built into the column shifter
can usually be identified by a purple starter wire. Typically, vehicles that use an
outboard mechanical switch use a yellow wire from the ignition switch to the
mechanical switch and a purple wire from the mechanical switch to the starter
itself. Remember, this is only a rule of thumb and is not intended as a substitute
for proper testing.
We suggest the following procedure to test for vehicles manufactured in this
way.
Note: You must complete the remote start system installation before doing the
following test. Ensure that the remote start system is functioning normally. This
includes connecting to the brake as a shut-down.
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