The Toyota Prius C or Aqua as it is known in Japan first came into sale in 2011.
The models with a smart key and push to start button come with a factory immobiliser. But if you have a base model with a traditional remote key then it may lack one. You can normally tell if there is an immobiliser as there will be a flashing padlock symbol in the instrument cluster.

Smartkey models already have a factory immobiliser
For models that do not have the factory immobiliser then recommend the Cobra 8510 as a minimum level of protection.
No Alarm
All models lack a factory alarm so if you are looking to improve your security then I recommend the Vodafone Automotive AK4615 CAN-BUS upgrade alarm.
Alarm features
- The alarm is fully functional using the Toyota remote
- Door, Boot & Bonnet Protection
- Internal Ultrasonic Movement Sensors
- Digital Battery Back-up Siren
- Horn Honk & Hazard Light Warning
Here are some photos of how the alarm looks in the Toyota Aqua

Ultrasonic internal movement sensors in the Prius C

LED over-ride switch in the Toyota Aqua
Easy Emergency Over-ride
The PIN code override can be customized to any 4-digit number so the alarm can be disarmed if the remote battery fails.
Toyota Aqua Alarm
Cobra AK4615 CAN-BUS Upgrade Alarm:
$700.00 (Price includes installation and GST)
Works with the factory remote
Optional Cobra Remote: $115.00
Optional Extras:
Tilt Sensor $150.00