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Siren
The Helios can sound the vehicle siren.
When wiring the Helios siren function, you can add an external siren or you can use
the vehicle's own horn.
The vehicle horn may use a large current and quickly deplete the
Note:
vehicle battery.
When there are no alarms, the Siren pin (#19) disconnects the coil (#85) of the
external relay from ground. In this case, the relay disconnects the siren (which is
connected through pin #87 of the relay (#87).
When a Helios alarm is activated, the Siren pin (#19) grounds the relay coil. As a
result, the siren is powered through the relay and sounds.
Figure 6 Siren Wiring Scheme
Locking System
Before making any changes to the vehicle wiring, verify which type of locking system
is in use. If you can identify the location of the locking engine and gain access to its
terminals, you may be able to make a direct connection without adding external
relays.
(–) (–) Locking
In this locking method, a negative pulse activates the locking mechanism and the next
negative pulse activates the unlocking mechanism – this is called (–)(–). It is also
possible to use (+)(+).
For vehicles with (–) (–) locking systems, you can wire the Helios without adding any
external relays, as follows:
1.
Connect Helios the Lock pin (#12) to the locking engine Lock terminal.
Installing the Helios
17
Simulation Kit Manual
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