sharpydoo

anyone know if its possible to add a microwave switch to a my00 factory fitted alarm? or will i need a new system all together to achieve this?

Sigma Sam

A microwave sensor can be fitted to the standard M30 system, so no need to replace the system, however it will take abit of wiring depending on the type of microwave sensor that you go for - single or dual zone?

Single Zone - here the microwave protects the vehicle interior in much the same way as the ultrasonic sesors and will trigger the alarm if movement is detected

Dual Zone - in addition to the internal zone, an the outer zone also extends beyond the vehicle and when movement is detected near to the vehicle in this zone an output is provided that can be used to sound a voice module or a simple buzzer (...the voice systems can create unwanted attention around your vehicle!)

Most microwave, shock or tilt sensors can be added to the standard UK Sigma M30 system provided that it gives a low (negative) output when the sensor is triggered and is activated by a low (negative) from the alarm when armed.
If you wish to fit multiple sensors, diodes should be fitted to prevent interference between the sensors' trigger outputs.

The Sigma M30 provides the low output to activate the sensors on pin 3 (provided that the alternative boot release output is not required), and the low input to trigger the system (Inner Zone) is best connected to pin 2 - this is also the boot trigger wire and allows simpler diagnostics in the future sould you experience false alarming problems with the sensor.

Dual Zone sensors can be powered from the Sigma M30 in the same way, although the output from the outer/first stage of the sensor would have to be used to power an underbonnet buzzer. This way the outer/first stage can be adjusted on the sensitive side to detect slight movement, but this will only cause the buzzer to sound - hopefully this will deter any undesirables without the inconvenience of frequent false alarms.

SS