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

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DTC U0415:68 [BLIND SPOT MONITORING (BSM) CONTROL MODULE]

Description	Error signal received from DSC HU/CM
Detection condition	Blind spot monitoring (BSM) control module (LH) receives the error signal from the DSC HU/CM for 2 s or more with the ignition switched ON (engine off or on).
Fail-safe	Blind spot monitoring (BSM) system is stopped.
Possible cause	DTCs are stored in the DSC HU/CM. DSC HU/CM malfunction DTCs are stored in the instrument cluster. Instrument cluster malfunction Blind spot monitoring (BSM) control module (LH) malfunction
System wiring diagram	Not applicable

Diagnostic Procedure

Step	Inspection		Action
1	VERIFY DSC HU/CM DTCs Retrieve the DSC HU/CM DTCs using the M-MDS. (See DTC INSPECTION [DSC HU/CM].) Are any DTCs displayed?	Yes	Repair or replace the malfunctioning part according to the applicable DTC troubleshooting. (See DTC TABLE [DSC HU/CM].)
		No	Go to the next step.
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	VERIFY THAT REPAIRS HAVE BEEN COMPLETED Clear the DTC for the blind spot monitoring (BSM) control module using the M-MDS. (See CLEARING DTC [BLIND SPOT MONITORING (BSM) CONTROL MODULE].) Switch the ignition ON (engine off or on) and wait for 3.5 s or more. Retrieve the blind spot monitoring (BSM) control module DTCs using the M-MDS. (See DTC INSPECTION [BLIND SPOT MONITORING (BSM) CONTROL MODULE].) Is the same DTC displayed?	Yes	Replace the blind spot monitoring (BSM) control module (LH), then go to the next step. (See BLIND SPOT MONITORING (BSM) CONTROL MODULE 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 [BLIND SPOT MONITORING (BSM) CONTROL MODULE].)
		No	DTC troubleshooting completed.

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