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Free to use workshop manual for your 2015+ Mk4 'ND' Mazda MX-5
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SEAT BELT WARNING ALARM

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.

U.S.A. and Canada

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

Passenger seat status signal

Occupant classification sensor
Except U.S.A. and Canada

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 activation function
    U.S.A. and Canada

  • The driver's side seat belt warning alarm has a warning for when the vehicle is stopped.

      • Warning while vehicle is stopped

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

      • Ignition is switched ON (engine off or on)

      • Driver's side buckle switch on signal (seat belt unfastened) is detected

    • The warning while vehicle is stopped sounds in the pattern shown in the figure.

  • 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

      • Passenger seat status signal (adult) or (child) (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.

      Subsequent warning

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

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

      • Passenger seat status signal (adult) or (child) (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.

    Except U.S.A. and Canada

  • 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 seat belt warning alarm only)

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

      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.

Construction

  • The seat belt warning alarm sounds using the buzzer built into the instrument cluster.

Operation

    U.S.A. and Canada

  • Warning while vehicle is stopped

    • When the instrument cluster receives (1) a driver's side buckle switch 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.

    • 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).

  • Initial warning/Subsequent warning

    • When the instrument cluster receives (1) a vehicle speed signal from the PCM, a driver's side/passenger's side buckle switch signal from the SAS control module, and passenger seat status signal (adult) or (child) from the occupant classification sensor via CAN communication while the ignition is switched ON (engine off or on), it turns on (2) the transistor.

    • 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).

    Except U.S.A. and Canada

  • 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.

  • 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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Free to use workshop manual for your 2015+ Mk4 'ND' Mazda MX-5

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