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

Purpose

  • The master warning light warns the driver that any of the following malfunctions is occurring.

    • Power supply system malfunction

    • Brake switch malfunction

    • Oil pressure switch malfunction

    • Global central configuration error

    • EPS (electric power steering) system malfunction

Functions

  • The instrument cluster turns the master warning light on based on the following CAN signals:

Signal name

Sending module/part name

Communication method

Power supply system error signal

PCM

HS-CAN

Brake switch No.1 error signal

Brake switch No.2 error signal

Oil pressure switch error signal

Global central configuration error signal

EPS (electric power steering) system error signal

EPS (electric power steering) control module

  • If the cancel procedure for preventing unnecessary operation of the brake override system is implemented, the PCM sends a master warning light flash request signal to the instrument cluster via CAN communication. The instrument cluster flashes the master warning light based on the master warning light flash request signal from the PCM. For the cancel procedure to prevent unnecessary operation of the brake override system, refer to [DRIVE-BY-WIRE CONTROL]. (See DRIVE-BY-WIRE CONTROL [SKYACTIV-G 2.0].)

  • The master warning light flashes in the pattern shown in the figure.

Construction

  • Turning on/flashing/turning off of the master warning light is controlled by the instrument cluster microcomputer based on each error signal or master warning light flash request signal sent from the PCM and EPS (electric power steering) control module.

  • The master warning light is built into the instrument cluster.

  • For vehicles with the center display, a warning message in the center display is displayed when the warning light is turned on or flashed. For the message content and verification method, refer to the [CENTER DISPLAY]. (See CENTER DISPLAY [WITH CENTER DISPLAY].)

Operation

  • The instrument cluster turns on (2) the transistor continuously when it receives (1) each error signal via CAN communication from the PCM or EPS (electric power steering) control module, and the instrument cluster turns on (2) the transistor intermittently when it receives (1) a master warning light flash request signal.

  • When the transistor is on continuously, the master warning light turns on (3), and if it turns on intermittently, the master warning light flashes (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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