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

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DTC U0423:68 [ADAPTIVE FRONT LIGHTING SYSTEM (AFS) CONTROL MODULE]

Description	Error signal received from instrument cluster Ignition switch error signal Selector lever position (R position) (AT)/reverse (MT) signal error Selector lever position (R position) (AT)/reverse (MT) signal not determined
Detection condition	Ignition switch error signal The adaptive front lighting system (AFS) control module received ignition switch error signal for 5 s or more with the ignition switched ON (engine off or on). Selector lever position (R position) (AT)/reverse (MT) signal error The adaptive front lighting system (AFS) control module received selector lever position (R position) (AT)/reverse (MT) signal error for 5 s or more with the ignition switched ON (engine off or on). Selector lever position (R position) (AT)/reverse (MT) signal not determined The adaptive front lighting system (AFS) control module detected undetermined selector lever position (R position) (AT)/reverse (MT) signal.
Fail-safe	Ignition switch error signal Control of the adaptive front lighting system (AFS) is continued with the ignition switched ON (engine on). Control of the headlight auto leveling system is continued. Selector lever position (R position) (AT)/reverse (MT) signal error The swivel actuator is moved to the center. Control of the headlight auto leveling system is continued. Selector lever position (R position) (AT)/reverse (MT) signal not determined Control of the swivel actuator is continued with the transmission range switch (AT)/back-up light switch (MT) fixed in the condition when the malfunction is determined. Control of the headlight auto leveling system is continued.
Possible cause	DTCs are stored in the instrument cluster. Instrument cluster malfunction Adaptive front lighting system (AFS) control module malfunction
System wiring diagram	Not applicable

Diagnostic Procedure

Step	Inspection		Action
1	VERIFY INSTRUMENT CLUSTER DTCs Retrieve the instrument cluster DTCs using the M-MDS. (See DTC INSPECTION [INSTRUMENT CLUSTER].) Is the DTC displayed?	Yes	Repair the malfunctioning part according to the applicable DTC troubleshooting. (See DTC TABLE [INSTRUMENT CLUSTER].)
		No	Go to the next step.
2	VERIFY IF MALFUNCTIONING LOCATION IS INSTRUMENT CLUSTER DEPENDING ON REPEATABILITY Clear the adaptive front lighting system (AFS) control module DTCs using the M-MDS. (See CLEARING DTC [ADAPTIVE FRONT LIGHTING SYSTEM (AFS) CONTROL MODULE].) Switch the ignition ON (engine off or on) and wait for 5 s or more. Retrieve the adaptive front lighting system (AFS) control module DTCs using the M-MDS. (See DTC INSPECTION [ADAPTIVE FRONT LIGHTING SYSTEM (AFS) CONTROL MODULE].) Is the same DTC displayed?	Yes	Replace the instrument cluster, then go to the next step. (See INSTRUMENT CLUSTER REMOVAL/INSTALLATION.)
		No	Go to Step 4.
3	VERIFY THAT REPAIRS HAVE BEEN COMPLETED Clear the adaptive front lighting system (AFS) control module DTCs using the M-MDS. (See CLEARING DTC [ADAPTIVE FRONT LIGHTING SYSTEM (AFS) CONTROL MODULE].) Switch the ignition ON (engine off or on) and wait for 5 s or more. Retrieve the adaptive front lighting system (AFS) control module DTCs using the M-MDS. (See DTC INSPECTION [ADAPTIVE FRONT LIGHTING SYSTEM (AFS) CONTROL MODULE].) Is the same DTC displayed?	Yes	Replace the adaptive front lighting system (AFS) control module, then go to the next step. (See ADAPTIVE FRONT LIGHTING SYSTEM (AFS) CONTROL MODULE REMOVAL/INSTALLATION.)
		No	Go to the next step.
4	VERIFY IF OTHER DTCs DISPLAYED Are any other DTCs displayed?	Yes	Repair the malfunctioning part according to the applicable DTC troubleshooting. (See DTC TABLE [ADAPTIVE FRONT LIGHTING SYSTEM (AFS) CONTROL MODULE].)
		No	DTC troubleshooting completed.

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