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	INSPECT ELECTRIC PARKING BRAKE SWITCH CONNECTOR CONDITION Switch the ignition off. Disconnect the negative battery cable. (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION [SKYACTIV-G 2.0, SKYACTIV-G 2.5] .) Disconnect the electric parking brake switch connector. Inspect the connector engagement and connection condition and inspect the terminals for damage, deformation, corrosion, or disconnection. Is the connector normal?	Yes	Go to the next step.
1		No	Repair or replace the connector, then go to Step 7.
2	INSPECT ELECTRIC PARKING BRAKE SWITCH Inspect the electric parking brake switch. (See ELECTRIC PARKING BRAKE SWITCH INSPECTION .) Is the electric parking brake switch normal?	Yes	Go to the next step.
2		No	Replace the electric parking brake switch, then go to Step 7. (See ELECTRIC PARKING BRAKE SWITCH REMOVAL/INSTALLATION .)
3	INSPECT ELECTRIC PARKING BRAKE CONTROL MODULE CONNECTOR CONDITION Disconnect the electric parking brake switch connector. Inspect the connector engagement and connection condition and inspect the terminals for damage, deformation, corrosion, or disconnection. Is the connector normal?	Yes	Go to the next step.
3		No	Repair or replace the connector, then go to Step 7.
4	INSPECT ELECTRIC PARKING BRAKE SWITCH CIRCUIT FOR SHORT TO POWER SUPPLY Verify that the electric parking brake switch and electric parking brake control module connectors are disconnected. Connect the negative battery cable. (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION [SKYACTIV-G 2.0, SKYACTIV-G 2.5] .) Switch the ignition ON (engine off or on). Measure the voltage at the following terminals (wiring harness-side): Electric parking brake switch terminal C Electric parking brake switch terminal E Electric parking brake switch terminal G Electric parking brake switch terminal H Is the voltage 0 V?	Yes	Go to the next step.
4		No	Refer to the wiring diagram and verify whether or not there is a common connector between the following terminals: Electric parking brake switch terminal C- Electric parking brake control module terminal 2K Electric parking brake switch terminal E- Electric parking brake control module terminal 2L Electric parking brake switch terminal G- Electric parking brake control module terminal 1W Electric parking brake switch terminal H- Electric parking brake control module terminal 2Q If there is a common connector: Determine the malfunctioning part by inspecting the common connector and the terminal for corrosion, damage, or pin disconnection, and the common wiring harness for a short to power supply. Repair or replace the malfunctioning part. If there is no common connector: Repair or replace the wiring harness which has a short to power supply. Go to Step 7.
5	INSPECT ELECTRIC PARKING BRAKE SWITCH CIRCUIT FOR OPEN CIRCUIT Switch the ignition off. Disconnect the negative battery cable. (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION [SKYACTIV-G 2.0, SKYACTIV-G 2.5] .) Verify that the electric parking brake switch and electric parking brake control module connectors are disconnected. Inspect for continuity between the following terminals (wiring harness-side): Electric parking brake switch terminal C- Electric parking brake control module terminal 2K Electric parking brake switch terminal E- Electric parking brake control module terminal 2L Electric parking brake switch terminal G- Electric parking brake control module terminal 1W Electric parking brake switch terminal H- Electric parking brake control module terminal 2Q Is there continuity?	Yes	Go to the next step.
5		No	Refer to the wiring diagram and verify whether or not there is a common connector between the following terminals: Electric parking brake switch terminal C- Electric parking brake control module terminal 2K Electric parking brake switch terminal E- Electric parking brake control module terminal 2L Electric parking brake switch terminal G- Electric parking brake control module terminal 1W Electric parking brake switch terminal H- Electric parking brake control module terminal 2Q If there is a common connector: Determine the malfunctioning part by inspecting the common connector and the terminal for corrosion, damage, or pin disconnection, and the common wiring harness for an open circuit. Repair or replace the malfunctioning part. If there is no common connector: Repair or replace the wiring harness which has an open circuit. Go to Step 7.
6	INSPECT ELECTRIC PARKING BRAKE SWITCH CIRCUITS FOR SHORT CIRCUIT Verify that the electric parking brake switch and electric parking brake control module connectors are disconnected. Inspect for continuity between electric parking brake switch terminals C, E, G, and H (wiring harness-side). Is there continuity?	Yes	Refer to the wiring diagram and verify whether or not there is a common connector between the following terminals: Electric parking brake switch terminal C- Electric parking brake control module terminal 2K Electric parking brake switch terminal E- Electric parking brake control module terminal 2L Electric parking brake switch terminal G- Electric parking brake control module terminal 1W Electric parking brake switch terminal H- Electric parking brake control module terminal 2Q If there is a common connector: Determine the malfunctioning part by inspecting the common connector and the terminal for corrosion, damage, or pin disconnection, and the common wiring harness for a short to each other. Repair or replace the malfunctioning part. If there is no common connector: Repair or replace the wiring harness which has a short to each other. Go to the next step.
6		No	Go to the next step.
7	VERIFY THAT REPAIRS HAVE BEEN COMPLETED Always reconnect all disconnected connectors. Connect the negative battery cable. (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION [SKYACTIV-G 2.0, SKYACTIV-G 2.5] .) Clear the DTC for the electric parking brake control module using the M-MDS. (See CLEARING DTC [ELECTRIC PARKING BRAKE] .) 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. Retrieve the electric parking brake control module DTCs using the M-MDS. (See DTC INSPECTION [ELECTRIC PARKING BRAKE] .) Is the same DTC displayed?	Yes	Repeat the inspection from Step 1. If the malfunction recurs, replace the electric parking brake control module. (See ELECTRIC PARKING BRAKE CONTROL MODULE REMOVAL/INSTALLATION .) Go to the next step.
7		No	Go to the next step.
8	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 [ELECTRIC PARKING BRAKE] .)
8		No	DTC troubleshooting completed.