FEB.20, 2003
RST872
24
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
(H5/3)
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
(H5/3)
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
2
D
N
R
Electronic Control Module (ECM)
Solid State, Do Not Measure
Resistance
To Neutral Safety
Switch Input wire
Black/White
(
H5/3
)
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 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 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.
Additional information concerning Key in Sensor methods 1&2 are listed below and should be reviewed
before considering either alternative.
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 vehicle 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 chime module will not alert the owner that the key has been left in the ignition switch. In addition, this may
also effect other warning 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.
METHOD 1
+ 12 V
Ignition Key In Sensor
Switch Closes with Key
In Ignition Cylinder
Drivers Door Pin Switch
87a
86
30
87
85
Key In
Chime Module
Connected to (-) Negative
Safety Input Wire
White/ Black
(
H5/1
)
To Hood Pin Switch
Safety Shut Down (
H5/1
)
1N4003
+ 12V
To connect to the key in sensor as shown in method 1:
A. Locate the control wire that connects the drivers door pin switch to the key in sensor switch.
B. Cut this wire and connect the ignition cylinder side to chassis ground.
C. Locate the key in sensor switch wire that connects the chime module to the ignition cylinder.
D. Cut this wire and connect the ignition cylinder side to terminal 30 of a P&B VF45F11 or equivalent relay.
