SEAT BELT WARNING ALARM
id092200019600
Purpose
• The seat belt warning alarm warns the driver that a seat belt is not fastened.
Functions
• The instrument cluster controls the seat belt warning alarm based on the following signals.
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Signal name
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Sending module/part name
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Communication method
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Vehicle speed signal
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PCM
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HS-CAN
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Driver's side/passenger's side buckle switch signal
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SAS control module
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Occupancy sensor signal
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Driver's side/passenger's side seat belt warning alarm activation function
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• The driver's side/passenger's side seat belt warning alarm has an initial warning and subsequent warning.
Initial warning
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• When all of the following conditions are met, the alarm sounds.
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― 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 seat belt warning alarm only)
• The initial warning sounds in the pattern shown in the figure.
Subsequent warning
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• When all of the following conditions are met, the alarm sounds.
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― 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.
Construction
• The seat belt warning alarm sounds using the buzzer built into the instrument cluster.
Operation
1. When 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 while the ignition is switched ON (engine off or on), it turns on (2) the transistor.
2. When the transistor turns on, a ground circuit with the seat belt warning alarm is established and the seat belt warning alarm is activated (3).
Fail-safe
• Not applicable
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