Safety Belt Sensor Always On

[shtou]

Hello guys.Can you help me with my problem?I installed this weekend aftermarket parking aid system (front and back). everything was ok until i start to move the car:i fasten the belt and the board led with safety warning and beep were on, even the belt was ok installed.what was happend?i am very angry about this.since today i cutted a blue wire from the wirings connectors near left legs and now the belt system is off completed(the driver part), but this is not the solution.what happened with my warning belt system?maybe i need a wiring diagram of the belt connections and seat connections. (my car is left hand drive).can everyone advice me about this problem?thanks.

[FROSTYBALLS]

Might be useful to know which country you're in. Also is this relating to an Avensis (your profile states you have a Corolla sedan)?

[shtou]

i'm from Romania.I also have a corrola sedan.But the problem is with the Avensis.I also have an Avensis 2007 D-4D 2.0, 126 Hp and 160k km.