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2016 – MX-5 – Body and Accessories

SEAT BELT WARNING LIGHT

Purpose

• The seat belt warning light warns the driver that a seat belt is not fastened.

Functions

• The instrument cluster flashes/turns on the seat belt warning light 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 light display function

U.S.A. and Canada

• The driver’s side/passenger’s side seat belt warning light has a warning for when the vehicle is stopped, while the vehicle is being driven, and subsequent warnings while the vehicle is being driven.

Warning while vehicle is stopped

• When all of the following conditions are met, the light flashes/turns on.

• Ignition is switched ON (engine off or on)

• Driver’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 light only)

• The warning while the vehicle is being driven flashes/turns on in the pattern shown in the figure.

  

Warning while vehicle is driven

• When all of the following conditions are met, the light flashes/turns on.

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

• Passenger seat status signal (adult) or (child) (occupant in passenger seat) is detected (passenger’s side seat belt warning light only)

• After warning while vehicle is being driven operates, buckle switch off signal (seat belt fastened) to on signal (seat belt unfastened) is detected

• The warning while the vehicle is being driven flashes/turns on in the pattern shown in the figure.

  

Subsequent warning while vehicle is driven

• When all of the following conditions are met, the light flashes/turns on.

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

• Passenger seat status signal (adult) or (child) (occupant in passenger seat) is detected (passenger’s side seat belt warning light only)

• After warning while vehicle is being driven operates, buckle switch off signal (seat belt fastened) to on signal (seat belt unfastened) is detected

• The subsequent warning while vehicle is driven flashes/turns on in the pattern shown in the figure.

  

Except U.S.A. and Canada

• The driver’s side/passenger’s side seat belt warning light has a warning for when the vehicle is stopped, while the vehicle is being driven, and subsequent warnings while the vehicle is being driven.

Warning while vehicle is stopped

• When all of the following conditions are met, the light turns on.

• Ignition is switched ON (engine off or on)

• 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 light only)

Warning while vehicle is driven

• When all of the following conditions are met, the light flashes/turns on.

• Vehicle speed is 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 light only)

• The warning while the vehicle is being driven flashes/turns on in the pattern shown in the figure.

  

Subsequent warning while vehicle is driven

• When all of the following conditions are met, the light flashes/turns on.

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

• Occupancy sensor on signal (occupant in passenger seat) is detected (passenger’s side seat belt warning light only)

• After warning while vehicle is being driven operates, buckle switch off signal (seat belt fastened) to on signal (seat belt unfastened) is detected

• The subsequent warning while vehicle is driven flashes/turns on in the pattern shown in the figure.

  

Construction

• The driver’s side seat belt warning light is built into the instrument cluster.

  

• The passenger’s side seat belt warning light is built into the indicator unit. For details on the passenger’s side seat belt warning light, refer to [INDICATOR UNIT]. (See INDICATOR UNIT.)

Operation

Driver’s side seat belt warning light

1. When the instrument cluster receives (1) a vehicle speed signal from the PCM and a driver’s buckle switch signal from the SAS control module via CAN communication while the ignition is switched ON (engine off or on), it turns the transistor on (2) intermittently for flashing and continuously for illumination.

2. When the transistor turns on intermittently, the driver???s seat belt warning light flashes (3), when it turns on continuously, the driver???s seat belt warning light turns on (3).

Passenger’s side seat belt warning light

• For the passenger’s side seat belt warning light operation, refer to [INDICATOR UNIT]. (See INDICATOR UNIT.)

Fail-safe

• Not applicable

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