Megalarm MEGA 474 Installation And Operation Manual - page 5
03282008
d). When the extend wires are needed, they must be exactly same gauge as the cut wire. Connect the cut
wire from the key switch to the RED wire (pin #30) of the relay, and connect the starter wire to the WHITE
wire (pin #87a) of the relay.
e). Connect the ORANGE Wire from the control module to the ORANGE wire (pin #86) of the relay.
f). Connect the Yellow wire (pin #85) of the relay to a switched 12 volts source from the ignition switch.
NOTE: If more than one electronic device will be connected to the ORANGE Wire, it will be necessary to
isolate the connection of each device control wires with a 1N4003 diode.
87
87a
85
30
86
IN4003 Diode
H3/5: ORANGE wire
from control module
“Start”
“On”
White wire
X
Cut
Red wire
Orange wire
“Acc”
“Off”
Starter
Yellow wire to
Ignition Switch
H3/6 . Gray wire – (-) 200mA Programmable Output –
CHANNEL 3 OUTPUT (Factory default setting)
This will become a 1 second pulse ground by press and hold
/ AUX
button on the transmitter for two
seconds. The current capacity of this wire is 200 mA. This feature allows you to remotely control the trunk
release or another electric device.
2 STEP UNLOCK OUTPUT (Set Feature
III – 2
Programming to “2 Step Door Unlock Output)
The 2 step unlock feature will work for the most fully electronic door lock circuit. The vehicle must have an
electronic door lock switch (not the lock knob or key switch), which locks and unlocks all of vehicle's doors.
When wired for this feature, press the
button one time to disarm the alarm and unlock the driver's door
only. If, press
button two times within 3 seconds, the alarm will disarm and all doors will unlock.
PAGER OUTPUT (Set Feature
III – 2
Programming to “PAGER Output)
This wire provides a negative output, when the alarm is triggered. The current capacity of this wire is 200mA.
For optional electronic device in this system, please connect to an additional relay. (i.e. Pager interface)
H4: RF ANTENNA - BLACK THIN WIRE (DO NOT CUT!!!)
The black thin wire on control module is the receiver antenna wire. Antenna placement is very important!
Ensure that it is unwrapped and stretched out with the last 6" straight and keep it away from large metal
objects or chassis for best reception.
H7: 3 PIN DOOR LOCK CONNECTOR:
Blue Wire
Green Wire
( - ) 200MA Lock Pulse
( - ) 200MA Unlock Pulse
3 Pin Mini-Molex Connector
INSTALL NEW DOOR LOCK MOTOR
Blue Wire
Green
+12V
30
86
87a
85
87
30
86
87a
85
87
3 Pin
Plug To
Alarm
NEGATIVE TRIGGER DOOR LOCK SYSTEM
Blue Wire Door Unlock
Green Wire Door Lock
Locking
Master
Switch
To Exiting
Door Lock Relay
POSITIVE TRIGGER DOOR LOCK SYSTEM
Locking
Master
Switch
To Exiting
Door Lock Relay
+ 12V
Blue Wire
Green
+12V
30
86
87a
85
87
30
86
87a
85
87
3 Pin
Plug To
Alarm
MEGA 470/474; VS 465/474L
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