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Free to use workshop manual for your 2015+ Mk4 'ND' Mazda MX-5

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DTC B10A6:62 [BCM]

Description	Light switch position signal error
Detection condition	The BCM detected a light switch position signal error received from the start stop unit for 5 s or more with the ignition switched ON (engine off or on).
Fail-safe	Exterior lighting system Turn the TNS (parking lights) and headlights LO on, and turn off other exterior light controls.
Possible cause	Start stop unit malfunction Light switch malfunction BCM malfunction
System wiring diagram	Not applicable

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 Inspect the light switch. (See LIGHT SWITCH INSPECTION.) Is the light switch normal?	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. If the malfunction recurs, replace the BCM. (See BODY CONTROL MODULE (BCM) REMOVAL/INSTALLATION.) 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.

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