Connectivity Master Unit (CMU) Removal/Installation: Notes

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 terminal. (Refer to NEGATIVE BATTERY TERMINAL DISCONNECTION/CONNECTION .)
Remove the following parts:
1. Center display (Refer to CENTER DISPLAY REMOVAL/INSTALLATION .)
2. Center speaker grille (Refer to SPEAKER GRILLE REMOVAL/INSTALLATION .)
3. Front center speaker (Refer to FRONT CENTER SPEAKER REMOVAL/INSTALLATION .)
Remove the bolts.

Fig 1: Identifying CMU And Bolts With Torque Specifications
Courtesy of MAZDA.
Remove the CMU in the direction of the arrow shown in the figure.

Fig 2: Removing CMU
Courtesy of MAZDA.
Disconnect the connectors.

Fig 3: Identifying CMU Connectors
Courtesy of MAZDA.
Install in the reverse order of removal. (Refer to CMU INSTALLATION NOTE .)
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. (Refer to DTC U2300:54 [CONNECTIVITY MASTER UNIT] .) (Refer to DTC U2300:55 [CONNECTIVITY MASTER UNIT] .)