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Connectivity Master Unit (CMU) Removal/Installation: Notes

NOTE:
  • The connectivity master unit (CMU) prior to replacement stores the vehicle specification information.
  • A new connectivity master unit (CMU) does not store any vehicle specification information.
  • When the ignition is switched ON after the connectivity master unit (CMU) is replaced, the connectivity master unit (CMU) reads the vehicle specification information sent via CAN transmission from the instrument cluster using the automatic configuration function, and stores it.
  • The Bluetooth® pairing information recorded in the connectivity master unit (CMU) cannot be written to a new connectivity master unit (CMU). Therefore, the Bluetooth® pairing information will be eliminated if the connectivity master unit (CMU) is replaced. Before replacing the connectivity master unit (CMU), explain to the customer that the Bluetooth® pairing resetting is required.
  1. Disconnect the negative battery terminal. (See NEGATIVE BATTERY TERMINAL DISCONNECTION/CONNECTION .)
  2. Remove the following parts:
    1. Center display (See CENTER DISPLAY REMOVAL/INSTALLATION .)
    2. Center speaker grille (See SPEAKER GRILLE REMOVAL/INSTALLATION .)
    3. Front center speaker (See FRONT CENTER SPEAKER REMOVAL/INSTALLATION .)
  3. Remove the bolts.
    Fig 1: Connectivity Master Unit (CMU) Bolts With Torque Specification
    G11431005Courtesy of MAZDA MOTORS CORP.
  4. Remove the connectivity master unit (CMU) in the direction of the arrow shown in the figure.
    G11431006Courtesy of MAZDA MOTORS CORP.
  5. Disconnect the connectors.
    G12266908Courtesy of MAZDA MOTORS CORP.
  6. Install in the reverse order of removal. (See Connectivity Master Unit (CMU) Installation Note .)
  7. When the connectivity master unit (CMU) is replaced, perform the automatic configuration using the following procedure.
    1. Switch the ignition ON (engine off or on).
    2. Select [Settings] on the center display.
    3. Select [System] on the center display.
    4. Select [Factory Reset] on the center display.
    5. Select [YES] on the center display and implement the connectivity master unit (CMU) initialization.
    6. Verify that the connectivity master unit (CMU) restarts and the menu screen is displayed.
    7. Switch the ignition OFF.
    8. Remove all of the remote transmitters from the vehicle, lock all doors, keep the remote transmitters 2 m or more from the vehicle, and wait for 5 minutes or more.
    9. The connectivity master unit (CMU) automatic configuration is completed.
    10. Using the M-MDS, verify that DTC U2300:55 is not displayed.
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