The Sigma S37 (manufactured by Scorpion Automotive) is a high-specification, insurance-approved Thatcham Category 2-1 CAN-Bus upgrade alarm system. Specifically engineered for modern commercial vehicles, high-value motorhomes, campervans, and luxury passenger cars, it integrates directly with the vehicle's electronic architecture (CAN-Bus) to provide robust perimeter and interior protection without requiring extensive rewiring.

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Below is a comprehensive description detailing its architecture, standard protection layers, user interaction, and expansion capabilities.

Technical Architecture & Core System Integration

The primary engineering asset of the Sigma S37 is its CAN-Bus (Controller Area Network) integration. Rather than relying on traditional analog hard-wiring into individual door switches and triggers, the S37 connects directly to the vehicle's digital data network.

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• OEM Remote Synchronization: The system reads the digital signals transmitted when you lock or unlock the vehicle using your original factory key fob. Locking the vehicle automatically arms the alarm; unlocking it disarms the system. This eliminates the need to carry an additional, cumbersome aftermarket key fob.ES Auto Installations

• Thatcham Category 2-1 Certification: This certification status denotes that the system is an officially recognized "alarm upgrade." It converts an existing factory-fitted immobilizer (Category 2) into a full-scale Category 1 equivalent security system, a classification frequently mandated by insurance companies to lower premiums on high-risk or high-value vehicles.Letang Auto Electrical Vehicle Parts

Standard Multi-Layered Protection

Out of the box, the Sigma S37 establishes three distinct layers of security to detect and deter unauthorized access:

1. Perimeter Monitoring

Through its CAN-Bus connection and dedicated inputs, the system continuously monitors the structural boundaries of the vehicle. If a door, the cabin bonnet, or the rear tailgates/boot are opened while the system is armed, the alarm is triggered instantly.

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2. Interior Ultrasonic Volumetric Detection

The system is supplied with a pair of cockpit-mounted ultrasonic sensors. These sensors emit high-frequency sound waves inside the front cabin space to detect volumetric changes caused by movement, such as an intruder smashing a window and reaching inside.

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3. Digitally Encoded Battery Backup Siren

Unlike basic alarms that rely on the vehicle's main battery, the Sigma S37 utilizes a waterproof, heavy-duty siren equipped with its own internal battery backup. If a thief cuts the vehicle’s main battery cables or attempts to disconnect the security loom to silence the system, the siren will continue to sound at full volume.

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Specialized Motorhome & Habitation Features

While highly effective for standard vans and cars, the Sigma S37 is uniquely tailored for motorhomes and campervans through specialized operational modes:

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• In-Dash Override Receptacle (Night Mode): The system features a dashboard-mounted control receptacle with an integrated LED status indicator. This allows users to manually isolate and isolate the internal ultrasonic sensors while keeping the perimeter door protections active. This "habitation mode" ensures you can sleep or move freely inside the living area at night without accidentally tripping the alarm, while remaining fully protected against external break-ins.Letang Auto Electrical Vehicle Parts

• Touch Key Emergency Override: In the event that your original OEM vehicle keys are lost, damaged, or their batteries die, the S37 includes a digitally coded touch key. By inserting this key into the dashboard receptacle, the user can securely disarm the system manually.Vehicle Defence+ 1

Wireless Expandability

The Sigma S37 houses a built-in Radio Frequency (RF) receiver, allowing it to serve as a security hub for larger vehicles. Users can pair multiple optional wireless accessories to the unit without running complex wiring through the interior panels:

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Accessory OptionTarget PlacementFunctional Use CasesWireless Magnetic Contact SensorsHabitation doors, side windows, gas hatches, and garage locker doors.Prevents perimeter breaches across extended living spaces and external storage bays.Wireless Passive Infrared (PIR) SensorsMain rear living quarters/habitation areas.Detects movement deeper inside a motorhome where front ultrasonic sensors cannot reach.Wireless Microwave SensorsExpansive open-plan interiors or soft-top areas.Delivers 360∘ volumetric coverage, highly resilient against false alarms caused by air movement or temperature fluctuations.

Telematics & Tracking Upgrades

The S37 features a dedicated output data port designed to interface seamlessly with ScorpionTrack (S7, S5, or S5-VTS+) tracking systems. When integrated with a telematics unit, an alarm trigger will not only flash the vehicle's indicators and sound the siren locally, but it will instantly send a push notification to your smartphone via the tracking application and alert a 24/7 monitored secure operating center.

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