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

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DTC U2300:56 [BCM]

Description	Configuration data unmatched with instrument cluster
Detection condition	Configuration data of the BCM and instrument cluster are not matched with the ignition switched ON (engine off or on).
Fail-safe	Not applicable
Possible cause	NOTE: To correctly write the configuration data sent from the instrument cluster to the BCM to the BCM, 30 s or more need to have elapsed since the ignition was switched ON (engine off or on). DTCs are stored in the instrument cluster. Instrument cluster configuration not implemented Instrument cluster internal memory malfunction BCM malfunction
System wiring diagram	Not applicable

Diagnostic Procedure

Step	Inspection		Action
1	VERIFY BCM DTCs AGAIN Clear the DTC for the BCM using the M-MDS. (See CLEARING DTC [BCM].) Switch the ignition ON (engine off or on) and wait for 30 s or more. Retrieve the BCM DTCs using the M-MDS. (See DTC INSPECTION [BCM].) Is the same DTC displayed?	Yes	Go to the next step.
		No	Go to Step 5.
2	VERIFY INSTRUMENT CLUSTER DTCs Retrieve the instrument cluster DTCs using the M-MDS. (See DTC INSPECTION [INSTRUMENT CLUSTER].) Are any DTCs displayed?	Yes	Repair or replace the malfunctioning part according to the applicable DTC troubleshooting. (See DTC TABLE [INSTRUMENT CLUSTER].)
		No	Go to the next step.
3	RESET CONFIGURATION DATA FROM INSTRUMENT CLUSTER TO BCM Using the M-MDS, perform the instrument cluster configuration (using As-Built data). (See INSTRUMENT CLUSTER CONFIGURATION (USING AS-BUILT DATA).) Clear the DTC for the BCM using the M-MDS. (See CLEARING DTC [BCM].) Switch the ignition ON (engine off or on) and wait for 30 s or more. Retrieve the BCM DTCs using the M-MDS. (See DTC INSPECTION [BCM].) Is the same DTC displayed?	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 5.
4	VERIFY THAT REPAIRS HAVE BEEN COMPLETED Clear the DTC for the BCM using the M-MDS. (See CLEARING DTC [BCM].) Switch the ignition ON (engine off or on) and wait for 30 s or more. Retrieve the BCM DTCs using the M-MDS. (See DTC INSPECTION [BCM].) Is the same DTC displayed?	Yes	Replace the BCM, then go to the next step. (See BODY CONTROL MODULE (BCM) REMOVAL/INSTALLATION.)
		No	Go to the next step.
5	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 [BCM].)
		No	DTC troubleshooting completed.

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