Audiovox IMO-720 - Manual (Page 2)

Vehicles with dash mounted ignition switches:
Remove the lower dash panel to gain access to the ignition key cylinder. Carefully remove the ignition key
cylinder from it’s dashboard mounting. Place the loop coil over the ignition cylinder and reinstall the ignition key
cylinder into it’s dashboard mounting location. Route the twisted pair of wires, Black and Black w/White stripe
toward the control module. In some cases it may be difficult to remove the cylinder from it’s mounting location,
in other cases, by placing the coil and reinstalling the cylinder, the coil will be crushed. For these applications,
it is possible to place the loop coil along side the ignition cylinder from behind the dash panel. It is extremely
important that you mount the loop coil as near to the key cylinder as possible to assure operation. Please review
the loop coil field and transponder relationship diagrams shown right side of the diagram below.
Wiring The Control Module:
5 Pin Main Wiring Harness:
1 Red Wire: + 12 Volt Supply:
This is the constant on battery source for the control circuit. This wire is to be connected to a constant + 12 volt
source using the 5 amp fuse provided. This wire will be connected last after wiring all other components. Do not
connect this wire until instructed later under the heading “Final Connections”.
2 Black Wire: Chassis Ground:
This is the ground source for the control circuit. Connect this wire to a known ground source or to a clean non painted
metal section of the vehicle chassis. NOTE: Be certain to remove any paint to insure a proper ground is made.
3 Yellow Wire: Ignition Input:
This is the ignition input wire for the control circuit. This wire also controls operation of the on board relays.
When the circuit is armed and this wire has +12 volts, the on board relays do not energize thereby, interrupt the
flow of current to the inhibit circuit (s) they are connected to. This wire must be connected to a source that has
+ 12 volts when the ignition switch is turned to the run and start positions and must have 0 volts when the ignition
switch is in the off position. This wire also wakes up the exciter coil to allow the transponder to receive and
transmit information to the control circuit’s arming and disarming functions.
NOTE: This immobilizer utilizes a normally open relay configuration. Be certain that the #1 + 12 Volt, #2 Chassis
Ground, #3 Ignition Control wires are securely connected to their proper location to insure vehicle operation.
4 Brown Wire: Negative Door Input:
This is the negative door input control wire, which wakes up the exciter coil, in negative pin switched door
applications. Typically General Motor, and some Imports vehicles use negative switched door pin switch circuits.
Connect this wire to the wire that switches to ground when the drivers door is opened.
5 Purple Wire: Positive Door Input:
This is the positive door input control wire, which wakes up the exciter coil, in positive pin switched door applications.
Typically Ford, Lincoln, and Mercury, and some Imports vehicles use positive switched door pin switch circuits.
Connect this wire to the wire that switches to positive 12 volts when the drivers door is opened.
NOTE: Wire #4, negative door input, or wire #5, positive door input, along with wire #3, ignition input, are used to
wake up the exciter coil enabling the transponder to receive and transmit information to the control
circuit. In addition, these wires are used during the transponder programming sequence. It is imperative
that one of these wires #4 or #5 be used in all applications dependent on the door pin’s switching polarity.
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