LEMON Manuals: Even more car manuals for everyone: 1960-2025
Home >> Mazda >> 2019 >> CX-9 Signature >> Repair and Diagnosis (Single Page) >> Accessories & Equipment >> Headlights >> On-Board Diagnostic - Adaptive Front Lighting Control Module >> DTC U0423-68: Error Signal Received From Instrument Cluster [Adaptive Front Lighting System (AFS) Control Module] >> Diagnostic Procedure
April 5, 2026: LEMON Manuals is launched! Read the announcement.

Diagnostic Procedure

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

Step Inspection Action
1 VERIFY INSTRUMENT CLUSTER DTCs
  • 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
  • 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
  • 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.
      Repair the malfunctioning part according to the applicable DTC troubleshooting.
4 VERIFY IF OTHER DTCs DISPLAYED
  • Are any other DTCs displayed?
Yes (See DTC TABLE [ADAPTIVE FRONT LIGHTING SYSTEM (AFS) CONTROL MODULE] .)
No DTC troubleshooting completed.