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Free to use workshop manual for your 2015+ Mk4 'ND' Mazda MX-5

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DTC U2300:55 [CONNECTIVITY MASTER UNIT]

Description	Instrument cluster configuration not implemented
Detection condition	The connectivity master unit (CMU) detected any of the following conditions with the ignition switched to ACC or ON (engine off or on). Instrument cluster configuration not read Configuration data cannot be written to connectivity master unit (CMU) memory.
Fail-safe	Not applicable
Possible cause	NOTE: To correctly write the configuration data, which is sent from the instrument cluster to the connectivity master unit (CMU), to the connectivity master unit (CMU), 30 s or more must have elapsed since the ignition was switched ON (engine off or on). Instrument cluster configuration is not completed. Instrument cluster malfunction Connectivity master unit (CMU) malfunction
System wiring diagram	Not applicable

Diagnostic Procedure

Step	Inspection		Action
1	VERIFY ALL SYSTEM DTCs Clear the DTC for the connectivity master unit (CMU) using the M-MDS. (See CLEARING DTC [CONNECTIVITY MASTER UNIT].) Switch the ignition ON (engine off or on) and wait for 37 s or more. Perform a CMDTC self-test using the M-MDS. (See DTC INSPECTION [CONNECTIVITY MASTER UNIT].) Are there any modules other than the connectivity master unit (CMU) displaying DTC U2300:55?	Yes	Using the M-MDS, perform the instrument cluster configuration (using As-Built data) again, then go to the next step. (See INSTRUMENT CLUSTER CONFIGURATION (USING AS-BUILT DATA).)
		No	Go to Step 3.
2	VERIFY ALL SYSTEM DTCs AGAIN Clear the DTC for the connectivity master unit (CMU) using the M-MDS. (See CLEARING DTC [CONNECTIVITY MASTER UNIT].) Switch the ignition ON (engine off or on) and wait for 37 s or more. Perform a CMDTC self-test using the M-MDS. (See DTC INSPECTION [CONNECTIVITY MASTER UNIT].) Are there any modules other than the connectivity master unit (CMU) displaying DTC U2300:55?	Yes	Replace the instrument cluster, then go to the next step. (See INSTRUMENT CLUSTER REMOVAL/INSTALLATION.)
		No	Go to the next step.
3	VERIFY THAT REPAIRS HAVE BEEN COMPLETED Clear the DTC for the connectivity master unit (CMU) using the M-MDS. (See CLEARING DTC [CONNECTIVITY MASTER UNIT].) Switch the ignition ON (engine off or on) and wait for 37 s or more. Retrieve the connectivity master unit (CMU) DTCs using the M-MDS. (See DTC INSPECTION [CONNECTIVITY MASTER UNIT].) Is the same DTC displayed?	Yes	Replace the connectivity master unit (CMU), then go to the next step. (See CONNECTIVITY MASTER UNIT (CMU) REMOVAL/INSTALLATION.)
		No	Go to the next step.
4	VERIFY IF OTHER DTCs DISPLAYED Are any other DTCs displayed?	Yes	Repair or replace the malfunctioning part according to the applicable DTC troubleshooting. (See DTC TABLE [CONNECTIVITY MASTER UNIT].)
		No	DTC troubleshooting completed.

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