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Home >> Mazda >> 2021 >> CX-3 AWD >> Repair and Diagnosis (Single Page) >> Accessories & Equipment >> Communication Devices >> On-Board Diagnostic - Body Control Module >> DTC B10A6-62: Light Switch Position Signal Error (BCM) >> Diagnostic Procedure

Diagnostic Procedure

DTC B10A6:62 (BCM) DIAGNOSTIC PROCEDURE

Step Inspection Action
1 VERIFY BCM DTCs AGAIN
  • Clear the DTC for the BCM using the M-MDS. (See CLEARING DTC (BCM) .)
  • Switch the ignition ON (engine off or on) and wait for 5 s or more.
  • Retrieve the BCM DTCs using the M-MDS. (See DTC INSPECTION (BCM) .)
  • Is the same DTC displayed?
Yes Go to the next step.
No Go to Step 6.
2 DETERMINE MALFUNCTIONING LOCATION BY PERFORMING PID/DATA MONITOR INSPECTION
  • Using the M-MDS, display the following PIDs for the start stop unit. (See PID/DATA MONITOR INSPECTION [START STOP UNIT] .)
    • H/L_SW_OFF
    • H/L_SW_HI
    • H/L_SW_LOW
    • H/L_SW_TNS
    • H/L_SW_PASS
  • Does the PID monitoring value switch correctly according to the light switch operation?
Yes Go to Step 4. (Circuit between light switch and start stop unit is normal.)
No Go to the next step.
3 INSPECT LIGHT SWITCH
Yes Replace the start stop unit, then go to Step 5.
(See START STOP UNIT REMOVAL/INSTALLATION .)
No Replace the light switch, then go to Step 5. (See LIGHT SWITCH REMOVAL/INSTALLATION .)
4 DETERMINE MALFUNCTIONING LOCATION BY PERFORMING PID/DATA MONITOR INSPECTION
  • Using the M-MDS, display the following PIDs for the BCM. (See PID/DATA MONITOR INSPECTION (BCM) .)
    • H/L_SW_OFF
    • H/L_SW_HI
    • H/L_SW_LOW
    • H/L_SW_TNS
    • H/L_SW_PASS
  • Does the PID monitoring value switch correctly according to the light switch operation?
Yes Go to the next step. (Circuit between start stop unit and BCM is normal.)
No Replace the start stop unit, then go to the next step.
(See START STOP UNIT REMOVAL/INSTALLATION .)
5 VERIFY THAT REPAIRS HAVE BEEN COMPLETED
  • Clear the DTC for the BCM using the M-MDS. (See CLEARING DTC (BCM) .)
  • Switch the ignition ON (engine off or on) and wait for 5 s or more.
  • Retrieve the BCM DTCs using the M-MDS. (See DTC INSPECTION (BCM) .)
  • Is the same DTC displayed?
Yes Repeat the inspection from Step 1.

Go to the next step.
No Go to the next step.
6 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 (BCM) .)
No DTC troubleshooting completed.