Helios Users Guide
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Appendix E – Connecting a Siren
Helios can be used to activate the siren. You can add an external siren or use
the vehicle horn.
NOTE: The vehicle horn can consume large amounts of energy and drain the
vehicle battery quickly.
When there is no alarm, the Siren RED/BLACK cable on 24-pin Helios wire
harness (Pin 19) disconnects the coil No. 85 (see diagram below) of the external
relay from ground. In this case, the relay disconnects the siren, which is
connected through the pin relay No. 87 (see diagram below).
When the Helios alarm is activated, the Siren RED/BLACK cable on 24-pin
Helios wire harness (Pin 19) grounds the relay coil. As a result, the siren is
activated through the relay.
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