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Mechanical neutral safety switch configurations differ slightly in that they
do not offer the same level of safety when installing a remote start device.
Often when the ignition switch is turned off while the gear selector is in
any position other than park or neutral, the mechanical function will not
allow the key to be turned to the start position or be removed from the
ignition cylinder. This configuration prevents mechanical operation while
the vehicle is in gear but offers no consideration for electrical operation.
Because of this potential problem, this installation requires the additional
connection of a safety wire from the remote start device to the vehicle
PARK/NEUTRAL ECM input or the vehicle key in sensor. This connection
will prevent remote start operation if the key is left in the ignition switch
regardless of the gear selector position.
PARK/NEUTRAL ECM INPUT:
The Park/Neutral ECM input is the preferred method of installation. This
not only maintains the integrity of the factory circuit, it is also the easiest
to install, providing the vehicle you are working on has this ECM input.
The installation required for this application (shown below), indicates in
the slight reconfiguration of the control switch wiring. Shown is a typical
GM Park/Neutral ECM input circuit. To connect the Remote Start unit to
the GM Park/Neutral ECM input:
1. Locate the Orange/Black reference wire in the “C2” connector found
at the ECM in GM B Body vehicles or, locate the equivalent reference
wire in the vehicle you are installing the Remote Start Unit in.
2. Connect the BLACK/WHITE Neutral Safety Switch wire (H7/3) to this
reference wire.
NOTE: If the optional remote starts enable toggle switch is installed,
connect the one side of the enable switch to this reference wire and
connect the other side of the enable switch to the BLACK/WHITE Neutral
Safety Switch wire (H6/2) of the Remote Start unit.
The reference diagram below shows a typical GM B Body ECM reference
wire and how it is to be connected to the Remote Start Unit.
Ignition
P
1
P
2
P
D
P
N
P
R
P
Electronic Control Module (ECM)
Solid State, Do Not Measure
Resistance
To Neutral Safety
Switch Input wire
Black/White
(
H7/3
)
Optional Enable Switch
KEY IN SENSOR CIRCUITS:
If the vehicle you are working on does not have or you cannot locate the
ECM reference wire, there are two alternatives available. Although not
