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Home >> Mazda >> 2017 >> CX-5 Grand Select, FWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 21 (On-Board Diagnostic - Start Stop Unit) >> DTC B124C-56: Turn Switch Circuit 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 PERFORM START STOP UNIT CONFIGURATION (AS-BUILT DATA USE) 
Yes Using the M-MDS, re-perform the start stop unit configuration using the As-Built data, then go to the next step.
(See START STOP UNIT CONFIGURATION (USING AS-BUILT DATA) .)
No Go to Step 5.
2 VERIFY IF INSTALLATIONS OF LIGHT SWITCH AND WIPER AND WASHER SWITCH ARE REVERSED 
  • Verify the installation condition of the light switch and the wiper and washer switch.
  • Are the light switch and the wiper and washer switch installed correctly?
Yes Go to the next step.
No Install the light switch and the wiper and washer switch properly, then go to Step 4.
3 INSPECT TURN SWITCH 
Yes Go to the next step.
No Replace the turn switch, then go to the next step.
(See LIGHT SWITCH REMOVAL/INSTALLATION .)
4 VERIFY THAT REPAIRS HAVE BEEN COMPLETED 
  • Clear start stop unit DTCs using the M-MDS.

    (See CLEARING DTC [START STOP UNIT] .)

  • Operate the turn switch to RH position and wait for 5 s or more  .
  • Operate the turn switch to LH position and wait for 5 s or more  .
  • Perform the start stop unit DTC inspection using the M-MDS.

    (See DTC INSPECTION [START STOP UNIT] .)

  • Is DTC B124C:56 displayed?
Yes Repeat the inspection from Step 1.
No Go to the next step.
5 VERIFY IF OTHER DTCs DISPLAYED 
  • Are any other DTCs displayed?
Yes Repair the malfunctioning part according to the applicable DTC troubleshooting.
(See DTC TABLE [START STOP UNIT] .)
No DTC troubleshooting completed.