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Home >> Mazda >> 2015 >> 3 SV, Automatic Trans >> Repair and Diagnosis >> Body & Frame >> Door Locks >> On-Board Diagnostic - Advanced Keyless Entry System >> DTC B13C3: 04 LF Control Unit Internal Malfunction >> Diagnostic Procedure

Diagnostic Procedure

DTC B13C3:04 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 Repeat the inspection from Step 1.

Go to the next step.
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.