Download 243 - Normally Closed Door Trigger Circuit.cdr

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Note #243 - Normally Closed Door Trigger Circuit
• Some newer vehicles (primarily Ford products) have normally closed (-)negative door pin circuits.
This means that the door pin wire will rest at chassis ground when the door is closed, then change to no
polarity when the door is opened. In some cases, it is more reliable to connect directly to the door pin circuits
individually. This can help prevent false triggering that can be experienced by connecting to the domelight
circuit. Interfacing with this type of circuit can be difficult. Basically, you need to isolate each door and
provide a positive potential voltage that can trigger the alarm.
1 amp diode
1 amp diode
OEM Alarm/
Body Control
Alarm
/
Module
Remote Start
To Door
Pin
Switches
1 amp diode
1 amp diode
10K
Ohm
Fused
(+)12v
10K
Ohm
Fused
(+)12v
1 amp diode
10K
Ohm
Fused
(+)12v
1 amp diode
10K
Ohm
Fused
(+)12v
1 amp diode
1 amp diode
Violet
(+) Door
Trigger
Input
Alarm /
Remote Start
IMPORTANT: Omega Research & Development, Inc. disclaims any liability in connection with installation and assumes no responsibility with
regards to the accuracy or currency of this information. This information is provided only as a reference. All circuits should be verified with a
digital multi-meter prior to making any connections. © Omega R & D, Inc. 2009
11/4/09