Starcom Systems Helios Installationsanleitung Seite 21

2. Connect the Helios Unlock pin (#1) to the locking engine Unlock terminal.
Figure 7 Wiring the (–) (–) Locking System without External Relays
If you cannot gain access to the locking engine, you can use external relays and
connect to the existing wires that lead to the locking engine. The following figure
describes this connection.
Figure 8 Wiring External Relays for (–) (–) Locking
Installing the Helios 18 Simulation Kit Manual