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Immobilizer
- Armed Wiring Diagram
What
is going on here ?
There are only 2 things going on during the “Armed”
state.
1. The Neutral Safety Switch circuit is broken
2. The 12 volt blinking LED light is blinking
How
do I disarm the system so I can start the vehicle ?
To disarm the system, touch the hidden reed switch with you
magnetic device (magnet in an old key fob works great). This
will send a ground to the negative side of the DPDT relay
coil and pull the contacts off of 1 & 4 and on to 5 &
8. A ground will be picked up on post 5 and passed to post
9 causing the DPDT coil to pull in permanently until the ground
is broken by pushing in the momentary switch.
1. The LED light will go off (contact pulled off of 4 and
on to 8)
2. 12v is passed to the SPDT relay in turn switching the relay
and connecting the neutral safety switch wire.
3. The ground will be passed thru the Normally Closed Momentary
Switch to post 5. The internal wiring of the DPDT relay will
pass the ground from post 5 to post 9. Since you jumped posts
9 & 13, the ground will keep the coil pulled in until
you break the ground by pressing the momentary switch.
Why
do you break the neutral safety and not another circuit ?
We like to break the neutral safety circuit because in the
event of a failure to any of the components, we do not want
the vehicle to shut down and leave us stranded on the side
of the road. During a failure of any components we will continue
to run. If we shut the vehicle down we will not be able to
start the vehicle. If the failure is in the DPDT relay, we
should be alerted when the LED starts to blink while the vehicle
is running. This will tell us not to shut down the vehicle
until we are is a spot to work on it.
If the SPDT relay fails, there isn’t an indicator to
warn us, but that could always be added using post 87a and
another LED somewhere. If it is the SPDT relay, we know where
it is hidden and we will be running again once we replace
the relay or jump the neutral safety wire.
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