Audiovox PRO-9175FT - Manual (Page 15)

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 is left in the ignition switch regardless of the gear selectors 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 the slight re-configuration of the control
switch wiring and the addition of a 4000 series diode. Shown is a typical GM Park/Neutral ECM input
circuit. To connect the Audiovox 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 Audiovox Remote Start Unit in.
2. Connect the Cathode, (Striped) end, of a 4000 series diode to this reference wire.
3. Connect the Anode, (Non Striped) end, of the diode to one side of the Remote Start enable switch.
4. Connect the other side of the enable switch to the Black/White enable input 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.
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 preferred, the vehicle Key In Sensor may be re-configured to allow a
margin of safety and will prevent the vehicle with a Mechanical Neutral Start Switch from starting in gear.
AUDIOVOX ADVISES 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 a vehicle
utilizing an electrical neutral start switch and is inconsistent with the operators manual.
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