Theft Alarm

GENERAL INFORMATION

[VEHICLES WITHOUT THEFT-ALARM SENSOR]

When the doors are locked using the keyless entry function or KOS (except when locked by using the key cylinder or door lock switch), the improper opening of door or liftgate causes the ETACS-ECU function and control to give off an alarm with the flashing of headlights and the intermittent sounding of horns [horn (HIGH, LOW) and theft-horn]. Also, the ETACS-ECU warns that the theft-alarm system is being set by flashing the theft-alarm indicator.

CONSTRUCTION DIAGRAM





[VEHICLES WITH THEFT-ALARM SENSOR]

The theft-alarm with the theft-alarm sensor and theft-alarm siren has been adopted.

- The alarm for door/hood tampering and the alarm for vehicle invasion, jack-up, or power line cutoff to the ETACS-ECU/theft-alarm siren are established.
- The theft-alarm sensor is connected to the ETACS-ECU via the LIN* bus line.
- The theft-alarm siren is connected to the ETACS-ECU by the LIN* bus line via the LIN cutoff control unit. (With the "Exterior protection" status, the horn does not sound.)

NOTE:
*:Local Interconnect Network

theft alarm sensor

- The ultrasonic wave sensor is incorporated to judge whether it is invasion or not from the change of reflected ultrasonic wave.
- The inclination sensor is incorporated to determine that it is an irregular action if the vehicle is raised for 3-degree angle or more at the rate of 1-degree angle or more per minute.

NOTE:
The sensor sensitivity can be adjusted by the M.U.T.-III.

LIN cutoff control unit

- With the "Ready to be triggered" status, the LIN communication between the theft-alarm siren and ETACS-ECU is cut off to suppress the occurrence of the dark current.
- With the "Ready to be triggered" status, if the ETACS-ECU detects invasion or irregular action by the theft-alarm sensor or tampering by the door switch or hood switch, the LIN communication is reactivated.
theft alarm siren

- If the ETACS-ECU detects irregular action, it sends a sounding request signal to the theft-alarm siren by the LIN communication.
- When the theft-alarm is in the "Ready to be triggered" status, if the signal transmission to the theft-alarm siren is cut off due to an abnormality in the power supply to the ETACS-ECU, the occurrence of irregular action is detected and the alarm sounds automatically* without the sounding request signal from the ETACS-ECU.

NOTE:
*: The theft-alarm siren incorporates a rechargeable battery.

CONSTRUCTION DIAGRAM





SYSTEM BLOCK DIAGRAM