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

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DTC U053B:68 [BCM]

Description	Error signal received from forward sensing camera (FSC)
Detection condition	BCM receives the error signals from the forward sensing camera (FSC) for 5 s or more with the ignition switched ON (engine off or on).
Fail-safe	Stop the headlight control done by the high beam control (HBC) system.
Possible cause	DTCs are stored in the forward sensing camera (FSC). Forward sensing camera (FSC) 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 5 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 FORWARD SENSING CAMERA (FSC) DTCs Retrieve the forward sensing camera (FSC) DTCs using the M-MDS. (See DTC INSPECTION [FORWARD SENSING CAMERA (FSC)].) Are any other DTCs displayed?	Yes	Repair or replace the malfunctioning part according to the applicable DTC troubleshooting. (See DTC TABLE [FORWARD SENSING CAMERA (FSC)].)
		No	Go to the next step.
3	VERIFY IF MALFUNCTIONING LOCATION IS FORWARD SENSING CAMERA (FSC) DEPENDING ON REPEATABILITY 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 5 s or more. Retrieve the BCM DTCs using the M-MDS. (See DTC INSPECTION [BCM].) Is the same DTC displayed?	Yes	Replace the forward sensing camera (FSC), then go to the next step. (See FORWARD SENSING CAMERA (FSC) REMOVAL/INSTALLATION.)
		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 5 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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