The Sigma S32 is a premium, highly regarded vehicle security system manufactured by Scorpion Automotive. It is specifically designed as a Thatcham Category 2 to 1 upgrade alarm. This means if your vehicle already has a factory-fitted engine immobiliser (Category 2), installing the S32 upgrades your vehicle to full Category 1 status—the highest tier of electronic vehicle security recognized by major insurance providers, which can significantly lower your premiums.

The standout feature of the Sigma S32 is its seamless integration: it is a "Plip" upgrade system, meaning it interfaces directly with your vehicle’s existing original equipment (OE) remote control keys. You do not need to carry any bulky, secondary key fobs; locking your doors with your standard car key automatically arms the system.

Key Features & Comprehensive Specifications

1. Comprehensive Perimeter & Interior Protection

• Perimeter Monitoring: The system wires directly into all doors, the boot, and the bonnet (supporting both positive and negative input circuits). If a thief attempts to force open any entry point, the alarm triggers instantly.

• Intelligent Ultrasonic Interior Protection: Dual cabin sensors monitor air movement inside the passenger compartment to detect glass breakage or a thief reaching through a window. The S32 features smart background monitoring: if it detects subtle environmental movement during its initial setup phase, it automatically recalibrates sensor sensitivity to eliminate annoying false alarms.

• Closed-Loop Accessory Protection: Includes a dedicated, looped-wire circuit meant to secure external accessories. If someone attempts to disconnect a trailer, a roof rack, or a bike carrier, the alarm loop breaks and sounds the siren.

2. High-Security Siren & Immobilisation

• Battery Back-Up Data Siren: The system includes a high-power, 120-decibel audio siren (the maximum legal volume limit). It is linked to the main ECU via a secure data link and features its own internal battery pack. If a thief tries to cut the vehicle's main battery cables from underneath to silence the car, the siren will instantly trigger on its own power.

• Single-Circuit Immobilisation: Features a robust onboard immobiliser circuit (rated at 18 amps continuous and 30 amps maximum) to prevent hotwiring.

3. Advanced Customisation & Key Theft Protection

• Key Theft Protection (Via Optional Keypad): One of the system's most advanced settings. When paired with an optional dashboard-mounted PIN keypad, you can set the vehicle to require a secure 4-digit PIN before the engine can start. Even if a thief steals your physical car keys out of your house, they still cannot drive your vehicle away.

• Visual Deterrent & Diagnostics: Uses a prominent, dashboard-mounted tri-colour LED. Beyond acting as a visual warning to thieves, the LED flashes specific color sequences upon entry to identify exactly which zone (door, bonnet, or ultrasonic) triggered the alarm last.

• Expansion Sockets: The rear of the main unit features plug-and-play sockets to easily add extra layered protection later, such as tilt/towing sensors or dual-stage shock sensors with pre-warn capabilities.

Convenience & Personal Safety Features

• Auto-Rearm & Lock: If you accidentally press the unlock button on your key fob while walking away, the S32 will automatically re-arm itself and re-lock the vehicle doors if no door is opened within a set window (adjustable between 1 and 99 seconds).

• Ignition Safety Auto-Locking: Can be programmed to automatically lock all vehicle doors as soon as the ignition is turned on at the start of a journey to protect against carjacking, and automatically unlocks them when the engine is turned off.

• Illumination Outputs: Provides negative outputs to trigger your vehicle’s interior cabin lights and main headlamps when disarmed, giving you courtesy lighting as you approach the vehicle in the dark.

• Secure PIN Override: If your factory key battery dies or the remote breaks, you can completely disarm the system manually using a secure ignition-turn sequence or the accessory keypad, ensuring you are never left stranded.

Note on Compliance: The Sigma S32 features silent arming and disarming by default to comply with European environmental noise legislation, though audible arming bleeps can be programmed back on if requested.