Mazda CX-5 Service & Repair Manual: Master Warning Light

Purpose

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

• Brake switch malfunction

• Engine oil solenoid valve malfunction

• Automatic configuration malfunction

Function

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

• Brake switch No.1 error signal, brake switch No.2 error signal, engine oil solenoid valve error signal, and automatic configuration error signal sent from the PCM

• The instrument cluster flashes the master warning light based on the master warning light flash request signal sent from the PCM as a CAN signal.

• The master warning light flashing pattern is as indicated in the figure.

  

  
  

Construction

• The instrument cluster microcomputer controls the illumination/flashing/turning off of the master warning light based on each error signal sent from the PCM.

• The master warning light is set in the instrument cluster.

  

  
  

Operation

• When the ignition is switched ON (engine off or on), the instrument cluster receives (1) each error signal or a master warning light flash request signal from the PCM.

• The instrument cluster turns the transistor on (2) intermittently for flashing and continuously for illumination based on each signal.

• The master warning light flashes (3) when the transistor is turned on intermittently, and it illuminates (3) when the transistor is turned on continuously.

Fail-safe

• Function not equipped.