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Home >> Mazda >> 2017 >> CX-5 Grand Select, FWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 86 (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-5. 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.
(See LF CONTROL UNIT REMOVAL/INSTALLATION .)
2 PERFORM DTC INSPECTION AND VERIFY IF MALFUNCTIONING PART IS START STOP UNIT 
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 the malfunctioning part according to the applicable DTC troubleshooting.
(See DTC TABLE [ADVANCED KEYLESS ENTRY SYSTEM] .)
No DTC troubleshooting completed.