Diagnostic Procedure

WARNING: This page is about a different car, the 2020 Mazda CX-30. However, it is still accessible from the selected car via links, so may be relevant.

Step	Inspection	Results	Action
1	VERIFY OPERATION CONDITION OF ELECTRIC PARKING BRAKE SWITCH BY CUSTOMER Verify if the customer did the following operation. While vehicle is stopped, electric parking brake switch is pulled up/pressed down continuously for 60 s or more Is the operation applicable to the customer?	Yes	System is normal. (Explain to the customer that it is not necessary to continuously pull up/press down the electric parking brake switch to operate/release the electric parking brake system.)
1		No	Go to the next step.
2	VISUALLY INSPECT ELECTRIC PARKING BRAKE SWITCH FOR MALFUNCTION Visually verify the electric parking brake switch for the following. Interference with surrounding parts Foreign matter penetration in movable parts Is the electric parking brake switch normal?	Yes	Go to the next step.
2		No	Interference with surrounding parts: Install the electric parking brake switch correctly. (See ELECTRIC PARKING BRAKE SWITCH REMOVAL/INSTALLATION .) If the malfunction recurs, replace the electric parking brake switch and perform the repair completion verification. (See ELECTRIC PARKING BRAKE SWITCH REMOVAL/INSTALLATION .) Foreign matter has penetrated movable parts: Remove the foreign matter and perform the repair completion verification.
Repair completion verification 1	VERIFY THAT VEHICLE IS REPAIRED Install/connect the part removed/disconnected during the troubleshooting procedure. Clear the DTC recorded in the memory. (See CLEARING DTC .) Perform the following procedure 3 times or more. Pull up the electric parking brake switch to operate the electric parking brake. Press down the electric parking brake switch to release the electric parking brake. Perform the DTC inspection for the DSC HU/CM. (See DTC INSPECTION .) Is the same Pending DTC present?	Yes	Refer to the controller area network (CAN) malfunction diagnosis flow to inspect for a CAN communication error. (See CONTROLLER AREA NETWORK (CAN) MALFUNCTION DIAGNOSIS FLOW (US) .) If the CAN communication is normal, perform the diagnosis from Step 1. If the malfunction recurs, replace the DSC HU/CM, then go to the next step. (See DSC HU/CM REMOVAL/INSTALLATION [L.H.D. (US)] .)
Repair completion verification 1		No	Go to the next step.
Repair completion verification 2	VERIFY IF OTHER DTCs DISPLAYED Perform the DTC inspection. (See DTC INSPECTION .) Are any DTCs displayed?	Yes	Repair the malfunctioning location according to the applicable DTC troubleshooting.
Repair completion verification 2		No	DTC troubleshooting completed.