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Connectivity Master Unit (CMU) Removal/Installation

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 cable. (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION .)
  2. Remove the following parts:
    1. Audio panel No. 2 (See AUDIO PANEL NO. 2 REMOVAL/INSTALLATION .)
    2. Audio panel No. 1 (See AUDIO PANEL NO. 1 REMOVAL/INSTALLATION .)
    3. Center display component (See CENTER DISPLAY REMOVAL/INSTALLATION .)
  3. Disconnect the connectors.
    G13153269Courtesy of MAZDA MOTORS CORP.
  4. Remove the screws.
    G13153270Courtesy of MAZDA MOTORS CORP.
  5. Remove the connectivity master unit (CMU).
  6. Install in the reverse order of removal.
  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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