2021 Mazda 3 BaseFACTORY OEM SERVICE PROCEDURE

Navigation function

  • The CMU performs map display and route guidance based on the position information received from the GPS antenna and the map information received from the USB port/SD card slot hub. For details, refer to the navigation function. (See ENTERTAINMENT SYSTEM (US) .)

Turn-by-turn (TBT) 

  • The turn-by-turn (TBT) function displays the travel direction of the route guidance in the active driving display. The turn-by-turn (TBT) operates when all of the following conditions have been met. For details, refer to the navigation function turn-by-turn (TBT) of the ENTERTAINMENT SYSTEM (US) .)
    • Route guidance of navigation function is operating
    • Navigation guidance is set to ON using the personalization function for the active driving display
  • The CMU sends the turn-by-turn (TBT) display request signal to the instrument cluster to display the direction heading and distance in the active driving display.
Factory Service Tools

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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.

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