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Relay is used to expand power capability of device outputs, it allows to control high current lines using low current device GPIO. This allows having XG device to block engine starting, limit access to driving, can disable or control high current devices such as siren, headlights, hazard lights or door locks.

1. Relay Basics

There are relays with multiple configurations, but in general they allow switching high current with low current. Every pin of relay is numbered, you can find marks on body of relay for easier wiring.

Great in depth article about relay differences: https://www.12voltplanet.co.uk/relay-guide.html .

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2. Physical Connection

Pins 85 and 86 are controlling circuit. On 5 pin relay pins 30 and 87a is connected when relay is not powered, when relay is powered pin 30 is disconnected from 87a and connected to pin 87.

2.1 Blocking Engine Start Example

Connect 85th pin of Relay to Output of device (for example, OUT2), 86th pin - to constant positive power. 30 and 87A is circuit, cutting vehicle's system. It is recommended to cut starter's control wire, as it is safe method to immobilize a vehicle. To 30 and 87A connect both ends of wire you cut.

Note. In case of using 87A pin - your relay works in Normally Closed mode. After immobilization signal (SMS, GPRS command, script control) device enables output and it disconnects the wire of vehicle's system. In case of removing of device, or fault of relay, you can continue using vehicle without immobilization.

Wiring diagram for LX40 and XG37 series

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Wiring diagram for LX40 and XG37 series

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