Audible Warning Device: Description and Operation

TONE ALARM







The ECU related to the alarm function types and various control functions are as follows.







Ignition key reminder tone alarm function
When the driver's door is opened with the ignition key inserted in the ignition key cylinder (ignition switch is in the OFF position,) the tone alarm sounds intermittently (horn sound) to indicate that the ignition key has not been removed.







Light reminder tone alarm function
When the taillight or headlight is ON, if the ignition key is removed and the driver's door is opened, a tone alarm will sound continuously to warn that the light is illuminated. However, if the taillight or headlight has been turned off by the headlight automatic-shutdown function, the tone alarm will not sound.







Seat belt tone alarm function
When the ignition switch is turned to ON position without fastening the driver's seat belt (driver's seat belt switch off), the tone alarm will sound for approximately six seconds to warn the driver to fasten the seat belt. When the driver's seat belt is fastened or the ignition switch is turned to OFF position, the tone alarm will stop sounding.



IGNITION KEY REMINDER TONE ALARM
The ignition key reminder tone alarm will sound under the following condition, and warn the driver to remove the ignition key.
- The driver's door is opened when the ignition switch is at "LOCK" (OFF) or "ACC" position without removing the ignition key.

However, the light reminder tone alarm will take precedence over this function.

The Ignition key reminder tone alarms is controlled by the Simplified Wiring System (SWS).
For troubleshooting, refer to Computers and Control Systems / Information Bus / Diagnosis.

Information Bus



IGNITION KEY REMINDER TONE ALARM FUNCTION
When the driver's door is opened (driver's door switch ON) without removing the ignition key [ignition switch to the "LOCK" (OFF) or "ACC" position], the tone alarm will sound intermittently to remind the driver that the ignition key has not been removed.


LIGHT REMINDER TONE ALARM FUNCTION
When the driver's door is opened (driver's door switch ON) with lighting switch (taillight switch or headlight switch) in the ON position and ignition switch in the "LOCK" (OFF) or "ACC" position, the tone alarm will sound continuously to remind the driver that the lights (taillights or headlights) are ON. This function does not work if the taillights or headlights are switched off through the headlight automatic shutdown function. In addition, the ignition key reminder tone alarm function has a priority over this function.