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Remote Start: Testing Your Installation
Mechanical Neutral Safety Switch Considerations:
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 if 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), 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 is 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 from the black 9-pin mini connector to this reference
wire.
Note: If the optional remote starts enable toggle switch is installed, connect the one side the enable switch to this
reference wire and connect the other side of the enable switch to the "Black/White" Neutral Safety Switch wire 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.
Optional Enable Switch
Black/White Wire
Neutral Safety Switch
Black 9-Pin
Mini Connector
Key in Sensor Circuits:
If the vehicle you ar working on does not have or you cannot locate the ECM reference wire, there are two alternatives
available. Although not preferred, the vehicle key in Sensor may be reconfigured to allow a margin of safety and will prevent
the vehicle with a Mechanical Neutral Start Switch from starting in gear. We advise that you maintain the factory circuit
whenever possible. The following two circuits may be used only if the above circuit is not available.
Note: When completing an installation using either of the following key in sensor circuits, if the operator inserts the ignition
key while the vehicle is running under the control of the Remote Start, the vehicle will shut down. This must be explained to
the operator as it is in contrast to the normal operation of the vehicle utilizing an electrical neutral start switch and is
inconsistent with the operators manual.
Method 1: Will allow the safety required for the remote start unit and prevent the vehicle from starting while in any
gear other than Park or Neutral while the key is in the ignition cylinder however If the key is left in the Ignition switch
and the door is left opened, the added relay will be energized causing a 150mA drain on the battery.
Method 2: Will allow the safety required for the remote start unit and prevent the vehicles from starting while in any
gear other than Park or Neutral while the key is in the ignition cylinder however, the original factory key in effect
other warming tones such as the light on reminder. These situations should be carefully considered before altering
the vehicle's wiring and must be fully explained to the consumer.
Electronic Control Module (ECM)
Solid State,
Ignition
Do Not Measure Resistance
P
R
1
N
2
29
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