Connectivity Master Unit (CMU) Removal/Installation

WARNING: This page is about a different car, the 2016 Mazda CX-3. However, it is still accessible from the selected car via links, so may be relevant.

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. (Refer to NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION .)
Remove the following parts:
1. Audio panel No. 2 (Refer to AUDIO PANEL No. 2 REMOVAL/INSTALLATION .)
2. Audio panel No. 1 (Refer to AUDIO PANEL No. 1 REMOVAL/INSTALLATION .)
3. Center display component (Refer to CENTER DISPLAY REMOVAL/INSTALLATION .)
Disconnect the connectors.

Fig 1: Disconnecting Connectors
Courtesy of MAZDA
Remove the screws.

Fig 2: Removing Screws
Courtesy of MAZDA
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. (Refer to DTC U2300:54 [CONNECTIVITY MASTER UNIT] .) (Refer to DTC U2300:55 [CONNECTIVITY MASTER UNIT] .)