Connectivity Master Unit (CMU) Removal/Installation

NOTE:

The connectivity master unit (CMU) prior to replacement stores the vehicle specification information.
A new CMU does not store any vehicle specification information.
When the ignition is switched ON after the CMU is replaced, the 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 CMU cannot be written to a new CMU. Therefore, the Bluetooth® pairing information will be eliminated if the CMU is replaced. Before replacing the CMU, explain to the customer that the Bluetooth® pairing resetting is required.

Disconnect the negative battery cable. (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION [SKYACTIV-G 2.5] .)
Remove the following parts:
1. Upper column cover (See COLUMN COVER REMOVAL/INSTALLATION .)
2. Meter hood (See METER HOOD REMOVAL/INSTALLATION .)
3. Passenger-side decoration panel (See DECORATION PANEL REMOVAL/INSTALLATION .)
4. Audio panel (See AUDIO PANEL REMOVAL/INSTALLATION .)
5. Center display component (See CENTER DISPLAY REMOVAL/INSTALLATION .)
Disconnect the connectors.

Fig 1: Identifying Center Display, Connector And CMU
Courtesy of MAZDA MOTORS CORP.
Remove the screws.

Fig 2: Identifying CMU And Center Display Screws
Courtesy of MAZDA MOTORS CORP.
Remove the CMU.
Install in the reverse order of removal.
When the CMU is replaced, perform the automatic configuration using the following procedure.
1. Switch the ignition ON (engine off or on) and wait for 1 min or more.
2. Switch the ignition off and wait for 3 s or more.
3. Switch the ignition ON (engine off or on) and complete the CMU automatic configuration.
4. Using the M-MDS, verify that DTC U2300:54 or U2300:55 is not displayed.
  - If DTC U2300:54 or U2300:55 is displayed, go to the DTC troubleshooting procedure. (See DTC U2300:54 [CONNECTIVITY MASTER UNIT] .) (See DTC U2300:55 [CONNECTIVITY MASTER UNIT] .)