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Home >> Mazda >> 2021 >> CX-3 AWD >> Repair and Diagnosis >> Body & Frame >> Door Locks >> On-Board Diagnostic - Advanced Keyless Entry System >> DTC B13C3-04: LF Control Unit Internal Malfunction (Advanced Keyless Entry System) >> Diagnostic Procedure
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Diagnostic Procedure

DTC B13C3:04 (ADVANCED KEYLESS ENTRY SYSTEM) DIAGNOSTIC PROCEDURE

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.
(See LF CONTROL UNIT REMOVAL/INSTALLATION .)
2 VERIFY THAT REPAIRS HAVE BEEN COMPLETED Yes Replace the start stop unit, then go to the next step.
(See 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.
(See DTC TABLE (ADVANCED KEYLESS ENTRY SYSTEM) .)
No DTC troubleshooting completed.