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Home >> Mazda >> 2021 >> CX-30 Turbo Premium >> Repair and Diagnosis >> External Pages >> Different car >> Section 247 (On-Board Diagnostic - MAZDA Connect (5 Of 5)) >> DTC U2300-55: Body Control Module (BCM) Configuration Not Performed [Connectivity Master Unit] >> Diagnostic Procedure

Diagnostic Procedure

WARNING: This page is about a different car, the 2020 Mazda CX-30. However, it is still accessible from the selected car via links, so may be relevant.
DTC U2300:55 (CONNECTIVITY MASTER UNIT) DIAGNOSTIC PROCEDURE

Step Inspection Results Action
1 INSPECT BODY CONTROL MODULE (BCM), CONNECTIVITY MASTER UNIT (CMU), AUDIO AMPLIFIER, AND REMOTE TUNER (RT) FOR MALFUNCTION
  • Perform the DTC inspection for the body control module (BCM) and the connectivity master unit (CMU). (Refer to the [DTC INSPECTION] in the appropriate service information)
  • Are any of the following DTCs displayed?
    • Code related to body control module (BCM) communication error, internal malfunction
    • Code related to internal malfunction of connectivity master unit (CMU)
    • Code related to audio amplifier malfunction
      • Code related to remote tuner (RT) malfunction
 Yes Repair the malfunctioning location according to the applicable DTC troubleshooting.
(Refer to the [DTC TABLE [BODY CONTROL MODULE (BCM)]] in the appropriate service information)
(See DTC TABLE [CONNECTIVITY MASTER UNIT (US)] .)
No Go to the next step.
2 VERIFY REPLACEMENT RECORD OF EACH MODULE
  • Verify if the following modules have been replaced before performing this troubleshooting procedure.
    • Audio amplifier
    • Remote tuner (RT)
      • Connectivity master unit (CMU)
  • Has any of the modules been replaced?
 Yes After implementing the required servicing according to each procedure when replacing a module, perform the repair completion verification.
(Refer to the [AUDIO AMPLIFIER REMOVAL/INSTALLATION] in the appropriate service information)
(Refer to the [REMOTE TUNER (RT) REMOVAL/INSTALLATION] in the appropriate service information)
(Refer to the [CONNECTIVITY MASTER UNIT (CMU) REMOVAL/INSTALLATION] in the appropriate service information)
No Go to the next step.
3 VERIFY IF MALFUNCTION IS CAUSED BY BODY CONTROL MODULE (BCM) CONFIGURATION ERROR
  • Switch the ignition OFF and wait for 30 s or more.
  • Switch the ignition ON (engine off or on) and wait for 30 s or more.
  • Clear the DTC recorded in the memory. (Refer to the [CLEARING DTC] in the appropriate service information)
  • Perform the DTC inspection for the connectivity master unit (CMU). (Refer to the [DTC INSPECTION] in the appropriate service information)
  • Is the same Pending DTC present?
 Yes Go to the next step.
No Go to repair completion verification 2.
4 VERIFY BODY CONTROL MODULE (BCM) CONFIGURATION RELATED DTCs
  • Clear the DTC recorded in the memory. (Refer to the [CLEARING DTC] in the appropriate service information)
  • Perform the DTC inspection for the body control module (BCM). (Refer to the [DTC INSPECTION] in the appropriate service information)
  • Is a configuration related DTC displayed?
 Yes Repair the malfunctioning location according to the applicable DTC troubleshooting.
(Refer to the [DTC TABLE [BODY CONTROL MODULE (BCM)]] in the appropriate service information)
No Go to the next step.
5 RESET CONFIGURATION DATA FOR BODY CONTROL MODULE (BCM)
  • Using the M-MDS, perform the body control module (BCM) configuration. (Refer to the [CONFIGURATION] in the appropriate service information)
  • Clear the DTC recorded in the memory. (Refer to the [CLEARING DTC] in the appropriate service information)
  • Perform the DTC inspection for the connectivity master unit (CMU). (Refer to the [DTC INSPECTION] in the appropriate service information)
  • Is the same Pending DTC present?
 Yes Replace the audio amplifier, then go to the next step.
(Refer to the [AUDIO AMPLIFIER REMOVAL/INSTALLATION] in the appropriate service information)
No Go to repair completion verification 2.
6 INSPECT REMOTE TUNER (RT) FOR MALFUNCTION DEPENDING ON REPEATABILITY
  • Clear the DTC recorded in the memory. (Refer to the [CLEARING DTC] in the appropriate service information)
  • Perform the DTC inspection for the connectivity master unit (CMU). (Refer to the [DTC INSPECTION] in the appropriate service information)
  • Is the same Pending DTC present?
 Yes Refer to the controller area network (CAN) malfunction diagnosis flow to inspect for a CAN communication error.
(Refer to the [CONTROLLER AREA NETWORK (CAN) MALFUNCTION DIAGNOSIS FLOW] in the appropriate service information)
If the CAN communication is normal, replace the remote tuner (RT), then go to the next step.
(Refer to the [REMOTE TUNER (RT) REMOVAL/INSTALLATION] in the appropriate service information)
No Go to repair completion verification 2.
7 INSPECT CONNECTIVITY MASTER UNIT (CMU) FOR MALFUNCTION DEPENDING ON REPEATABILITY
  • Clear the DTC recorded in the memory. (Refer to the [CLEARING DTC] in the appropriate service information)
  • Perform the DTC inspection for the connectivity master unit (CMU). (Refer to the [DTC INSPECTION] in the appropriate service information)
  • Is the same Pending DTC present?
 Yes Refer to the controller area network (CAN) malfunction diagnosis flow to inspect for a CAN communication error.
(Refer to the [CONTROLLER AREA NETWORK (CAN) MALFUNCTION DIAGNOSIS FLOW] in the appropriate service information)
If the CAN communication is normal, replace the connectivity master unit (CMU) and perform the repair completion verification.
(Refer to the [CONNECTIVITY MASTER UNIT (CMU) REMOVAL/INSTALLATION] in the appropriate service information)
No Go to repair completion verification 2.
Repair completion verification 1 VERIFY THAT VEHICLE IS REPAIRED
  • Install/connect the part removed/disconnected during the troubleshooting procedure.
  • Clear the DTC recorded in the memory. (Refer to the [CLEARING DTC] in the appropriate service information)
  • Perform the DTC inspection for the connectivity master unit (CMU). (Refer to the [DTC INSPECTION] in the appropriate service information)
  • Is the same Pending DTC present?
 Yes Refer to the controller area network (CAN) malfunction diagnosis flow to inspect for a CAN communication error.
(Refer to the [CONTROLLER AREA NETWORK (CAN) MALFUNCTION DIAGNOSIS FLOW] in the appropriate service information)
If the CAN communication is normal, perform the diagnosis from Step 1.
  • If the malfunction recurs, replace the body control module (BCM), then go to the next step. (Refer to the [BODY CONTROL MODULE (BCM) REMOVAL/INSTALLATION] in the appropriate service information)
No Go to the next step.
Repair completion verification 2 VERIFY IF OTHER DTCs ARE DISPLAYED
  • Perform the DTC inspection. (Refer to the [DTC INSPECTION] in the appropriate service information)
  • Is a DTC displayed?
 Yes Repair the malfunctioning location according to the applicable DTC troubleshooting.
No DTC troubleshooting completed.
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