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Neutral safety switch interface

Some vehicles combine the column shift mechanism and the mechanical neutral

safety switch into one mechanical part. In these vehicles, it is impossible to in-

terface the remote engine start system before the neutral safety switch. With this

type of vehicle, if the vehicle is left in a drive gear and the remote engine start

system is activated, the vehicle will move and may cause damage to persons

or property.

According to available information, vehicles known to be manufactured this

way are most General Motors trucks, sport utility vehicles and column shifting

passenger vehicles. Available information also indicates that pre-1996 Dodge

Dakota pickups with 2.5 liter motors are also manufactured this way.

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.

Important: Please see vehicle Safety Check section of this guide for testing

procedures.

Vehicles with the neutral safety switch built into the column shifter require that

the shifter be placed in park in order to remove the keys from the ignition. As

a result, it is possible to use the key-in-ignition sense switch to prevent remote

engine starting if the keys are in the ignition. (See General Motors Trucks, SUVs

and Column-Shifting Passenger Cars and Pre-1996 Dodge Dakota Pickups with

2.5 Liter Motors diagrams in this section on how to accomplish this.) The first

diagram applies to all General Motors vehicles as of the date of this guide’s

publication. The second diagram applies to all pre-1996 Dodge Dakota pickup

trucks with 2.5 liter motors. This solution has one side effect: If the customer

inserts the key in the ignition with the driver's door open, the remote engine

start system will shut down. If this interface is used, it is important to inform the

customer that the driver’s door must be closed before inserting the key into the

ignition when the remote engine start is active. This will allow the customer to

turn the key on and shut the remote engine start down by pressing the brake,