INTRUDER SENSOR CONSTRUCTION/OPERATION


BHE091450000T04

Outline

• The intruder sensor is located in the center of the roof on vehicles with a sunroof or the forward part of the roof on vehicles without a sunroof.

• The intruder sensor detects movement in the vehicle using radio waves and sends a detection signal to the keyless unit.

• An intruder sensor cut-off button is provided on the keyless entry system transmitter. If the intruder sensor cut-off button is pressed while the theft-deterrent system is pre-armed, intruder sensor radio wave output is cut, and movement detection is stopped.

1
Intruder sensor (Vehicles without sunroof)
2
Intruder sensor (Vehicles with sunroof)
3
Transmitter
4
Intruder sensor cut-off switch
5
Front

Operation

1. When the theft-deterrent system is armed, the intruder sensor outputs a 2.45 GHz radio wave in the passenger compartment. The intruder sensor detects phase differences in radio waves (reflected waves) that are output and bounced off a target object.

2. When a phase difference in reflected waves occurs due to movement in the vehicle (intruder), the CPU calculates the level of phase difference.

3. If the level of phase difference is more than specified, the intruder sensor sends a detection signal to the keyless unit.

1
Target object
2
Receiver
3
Transmitter
4
Phase detection area
5
Oscillator
6
CPU
7
Detection signal output
8
Keyless unit
9
Intruder sensor