I am about to remove one of these from my car that I leased this past week.
The blue light (mine is now covered) has a blue plastic button on the side, the button is used for programming the remotes and for placing the system in to "valet" mode.
There are likely two shock sensor units in the car, one in the controller and one mounted under a trim panel towards the rear section of the cabin. The controller may have a shock sensor as there is a blue colored dial for sensitivity on the opposite side. I followed the wiring from the light/button to the controller unit and found the controller unit has speaker cables running from it. The two speaker cables, a single and a double, running along and under the driver side scuff panels and through the driver side rear tire house panel (the hatch area). This is where I am pretty certain the additional shock sensor has been installed.
The controller unit (brain) is connected to various wires at the harnesses at the drivers side kick panel. One wire under the dash that is green (ignition) has been cut and connected to two orange cables that go into the controller (kill start).
I am going to remove everything this weekend following the information on trim removal in the service manual.
The controller unit I found because it fell on the floor while driving, I was rather curious about the KARR system since the dealer left the hardware installed. (It must not be worth much if they can eat the cost of leaving it in a car unactivated and might cost more$ money to remove it than its actually worth.)
My car is manual and I guess the installer forgot to secure it with a zip-tie or however they lock it down from moving around. (Rather dangerous to leave something like this unsecured next to the clutch and brake as it could obstruct the ability to stop the vehicle.)
I leased my car from John Hine Mazda of San Diego. They wanted $599 to activate the KARR Security System. I declined for two reasons, I know the car has a factory system and because I have insurance with more than enough coverage.
I recently asked the dealer to remove the module but they want $ to do that. They offered to securely mount it for no cost but need to charge me for removal. Since the controller fell I have had two instances of my car not wanting to start, pretty certain it has caused a short to those green wires because if I wiggle the controller unit lightly the car starts up right after.
Control Unit Top
Control Unit Bottom
Control Unit unsecured hanging
Cable from Control unit