SEAT BELT WARNING ALARM

id092200019600

Purpose

Function

Signal name	Sending module/part name	Communication method
Vehicle speed signal	PCM	HS-CAN
Driver's side/passenger's side buckle switch signal	SAS control module
Occupancy sensor signal

Driver's side/passenger's side seat belt warning alarm sound function

•  The driver's side/passenger's side seat belt warning alarm has an initial warning and subsequent warning.

Initial warning

•  When all of the following conditions are met, the alarm sounds.

―  Vehicle speed is approx. 20 km/h {12 mph} or more

―  Driver's side/passenger's side buckle switch on signal (seat belt unfastened) is detected

―  Occupancy sensor on signal (occupant in passenger seat) is detected (passenger's side seat belt warning alarm only)

•  The initial warning sounds in the pattern shown in the figure.

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Subsequent warning

•  When all of the following conditions are met, the alarm sounds.

―  Vehicle speed is approx. 20 km/h {12 mph} or more

―  Occupancy sensor on signal (occupant in passenger seat) is detected (passenger seat belt warning alarm only)

―  After initial warning operates, buckle switch off signal (seat belt fastened) to on signal (seat belt unfastened) is detected

•  The subsequent warning sounds in the pattern shown in the figure.

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Construction

Operation

1.  When the ignition is switched ON (engine off or on), the instrument cluster receives (1) a vehicle speed signal from the PCM, and a driver's side/passenger's side buckle switch signal and occupancy sensor signal from the SAS control module via CAN communication.

2.  The instrument cluster turns the transistor on (2) based on each signal.

3.  When the transistor turns on, a ground circuit with the seat belt warning alarm is established and the seat belt warning alarm sounds (3).

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Fail-safe