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Home >> Mazda >> 2021 >> CX-3 AWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 89 (On-Board Diagnostic - Advanced Keyless Entry System) >> DTC B13C3-04: LF Control Unit Internal Malfunction >> Diagnostic Procedure

Diagnostic Procedure

WARNING: This page is about a different car, the 2016 Mazda CX-3. However, it is still accessible from the selected car via links, so may be relevant.
Step Inspection Action
1 INSPECT LF CONTROL UNIT  Yes Go to the next step.
No Replace the LF control unit, then go to the next step.
(Refer to LF CONTROL UNIT REMOVAL/INSTALLATION .)
2 VERIFY THAT REPAIRS HAVE BEEN COMPLETED  Yes Replace the start stop unit, then go to the next step.
(Refer to START STOP UNIT REMOVAL/INSTALLATION .)
No Go to the next step.
3 VERIFY IF OTHER DTCs DISPLAYED 
  • Are any other DTCs displayed?
Yes Repair or replace the malfunctioning part according to the applicable DTC troubleshooting.
(Refer to DTC TABLE [ADVANCED KEYLESS ENTRY SYSTEM] .)
No DTC troubleshooting completed.