Diagnostic Procedure

WARNING: This page is about a different car, the 2016 Mazda CX-3. However, it is still accessible from the selected car via links, so may be relevant.

Step	Inspection		Action
1	VERIFY BCM DTCs AGAIN Clear the DTC for the BCM using the M-MDS. (Refer to 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. (Refer to DTC INSPECTION [BCM] .) Is the same DTC displayed?	Yes	Go to the next step.
1		No	Go to Step 5.
2	VERIFY START STOP UNIT DTCs Retrieve the start stop unit DTCs using the M-MDS. (Refer to DTC INSPECTION [START STOP UNIT] .) Are any other DTCs displayed?	Yes	Repair or replace the malfunctioning part according to the applicable DTC troubleshooting. (Refer to DTC TABLE [START STOP UNIT] .)
2		No	Go to the next step.
3	INSPECT LIGHT SWITCH Inspect the light switch. (Refer to LIGHT SWITCH REMOVAL/INSTALLATION .) Is the light switch normal?	Yes	Replace the start stop unit, then go to the next step. (Refer to START STOP UNIT REMOVAL/INSTALLATION .)
3		No	Replace the light switch, then go to the next step. (Refer to LIGHT SWITCH REMOVAL/INSTALLATION .)
4	VERIFY THAT REPAIRS HAVE BEEN COMPLETED Clear the DTC for the BCM using the M-MDS. (Refer to 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. (Refer to DTC INSPECTION [BCM] .) Is the same DTC displayed?	Yes	Replace the BCM, then go to the next step. (Refer to BODY CONTROL MODULE (BCM) REMOVAL/INSTALLATION .)
4		No	Go to the next step.
5	VERIFY IF OTHER DTCs DISPLAYED Are any other DTCs displayed?	Yes	Repair or replace the malfunctioning part according to the applicable DTC troubleshooting. (Refer to DTC TABLE [BCM] .)
5		No	DTC troubleshooting completed.