ELECTRIC PARKING BRAKE SWITCH INDICATOR LIGHT IS ON OR OFF CONSTANTLY [ELECTRIC PARKING BRAKE]

• If there is any vehicle malfunction complaint lodged by a customer, perform FOREWORD [FOREWORD [ELECTRIC PARKING BRAKE] malfunction diagnosis according to the troubleshooting procedure. (See FOREWORD [ELECTRIC PARKING BRAKE].)

Step	Inspection	Action
1	VERIFY ALL SYSTEM DTCs • Switch the ignition OFF. • Switch the ignition ON (engine off or on) and wait for 10 s or more. • Perform a CMDTC self-test using the M-MDS. (See DTC INSPECTION [ELECTRIC PARKING BRAKE].) • Are any DTCs displayed?	Yes	Repair or replace the malfunctioning part according to the applicable DTC troubleshooting. (See DTC TABLE [ELECTRIC PARKING BRAKE].)
No	Go to the next step.
2	VERIFY IF THE ELECTRIC PARKING BRAKE WARNING LIGHT IS TURNED ON • Verify if the electric parking brake warning light is turned on. • Is the electric parking brake warning light turned on?	Yes	Perform an inspection referring to “ELECTRIC PARKING BRAKE WARNING LIGHT TURNS ON”. (See ELECTRIC PARKING BRAKE WARNING LIGHT TURNS ON [ELECTRIC PARKING BRAKE].)
No	Go to the next step.
3	INSPECT ELECTRIC PARKING BRAKE SWITCH CONNECTOR CONDITION • Switch the ignition OFF. • Disconnect the negative battery terminal. (See NEGATIVE BATTERY TERMINAL DISCONNECTION/CONNECTION.) • 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.
No	Repair or replace the connector.
4	VERIFY ELECTRIC PARKING BRAKE CONTROL MODULE POWER SUPPLY VOLTAGE • Verify that the electric parking brake switch connector is disconnected. • Connect the negative battery terminal. (See NEGATIVE BATTERY TERMINAL DISCONNECTION/CONNECTION.) • Measure the voltage at the electric parking brake switch terminal K (wiring harness-side). • Is the voltage B+?	Yes	Go to the next step.
No	Inspect the AT 15 A fuse and MAIN 200 A fuse. • If the fuse is blown: ? Refer to the wiring diagram and verify whether or not there is a common connector between battery positive terminal and electric parking brake switch terminal K. 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 ground. • Repair or replace the malfunctioning part. If there is no common connector: • Repair or replace the wiring harness which has a short to ground. • Replace the fuse. • If the fuse is damaged: ? Replace the fuse. • If the fuse is normal: ? Refer to the wiring diagram and verify whether or not there is a common connector between battery positive terminal and electric parking brake switch terminal K. 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.
5	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.
No	Replace the electric parking brake switch. (See ELECTRIC PARKING BRAKE SWITCH REMOVAL/INSTALLATION.)
6	INSPECT ELECTRIC PARKING BRAKE CONTROL MODULE CONNECTOR CONDITION • Switch the ignition OFF. • Disconnect the negative battery terminal. (See NEGATIVE BATTERY TERMINAL DISCONNECTION/CONNECTION.) • Disconnect the electric parking brake control module 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.
No	Repair or replace the connector.
7	INSPECT ELECTRIC PARKING BRAKE SWITCH CIRCUIT FOR SHORT TO GROUND • Verify that the electric parking brake switch and electric parking brake control module connectors are disconnected. • Inspect for continuity between electric parking brake switch terminal L (wiring harness-side) and body ground. • Is there continuity?	Yes	Refer to the wiring diagram and verify whether or not there is a common connector between electric parking brake switch terminal L and electric parking brake control module terminal 1R. 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 ground. • Repair or replace the malfunctioning part. If there is no common connector: • Repair or replace the wiring harness which has a short to ground.
No	Go to the next step.
8	INSPECT ELECTRIC PARKING BRAKE SWITCH CIRCUIT FOR OPEN CIRCUIT • Verify that the electric parking brake switch and electric parking brake control module connectors are disconnected. • Inspect the wiring harness for continuity between electric parking brake switch terminal L (wiring harness-side) and electric parking brake control module terminal 1R (wiring harness-side). • Is there continuity?	Yes	Replace the electric parking brake control module. (See ELECTRIC PARKING BRAKE CONTROL MODULE REMOVAL/INSTALLATION.)
No	Refer to the wiring diagram and verify whether or not there is a common connector between electric parking brake switch terminal L and electric parking brake control module terminal 1R. 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.

Step

Inspection

Action

VERIFY ALL SYSTEM DTCs

• Switch the ignition OFF.

• Switch the ignition ON (engine off or on) and wait for 10 s or more.

• Perform a CMDTC self-test using the M-MDS.

(See DTC INSPECTION [ELECTRIC PARKING BRAKE].)

• Are any DTCs displayed?

Yes

Repair or replace the malfunctioning part according to the applicable DTC troubleshooting.

(See DTC TABLE [ELECTRIC PARKING BRAKE].)

Go to the next step.

VERIFY IF THE ELECTRIC PARKING BRAKE WARNING LIGHT IS TURNED ON

• Verify if the electric parking brake warning light is turned on.

• Is the electric parking brake warning light turned on?

Yes

Perform an inspection referring to “ELECTRIC PARKING BRAKE WARNING LIGHT TURNS ON”.

(See ELECTRIC PARKING BRAKE WARNING LIGHT TURNS ON [ELECTRIC PARKING BRAKE].)

Go to the next step.

INSPECT ELECTRIC PARKING BRAKE SWITCH CONNECTOR CONDITION

• Switch the ignition OFF.

• Disconnect the negative battery terminal.

(See NEGATIVE BATTERY TERMINAL DISCONNECTION/CONNECTION.)

• 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.

Repair or replace the connector.

VERIFY ELECTRIC PARKING BRAKE CONTROL MODULE POWER SUPPLY VOLTAGE

• Verify that the electric parking brake switch connector is disconnected.

• Connect the negative battery terminal.

(See NEGATIVE BATTERY TERMINAL DISCONNECTION/CONNECTION.)

• Measure the voltage at the electric parking brake switch terminal K (wiring harness-side).

• Is the voltage B+?

Yes

Go to the next step.

Inspect the AT 15 A fuse and MAIN 200 A fuse.

• If the fuse is blown:

? Refer to the wiring diagram and verify whether or not there is a common connector between battery positive terminal and electric parking brake switch terminal K.

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 ground.

• Repair or replace the malfunctioning part.

If there is no common connector:

• Repair or replace the wiring harness which has a short to ground.

• Replace the fuse.

• If the fuse is damaged:

? Replace the fuse.

• If the fuse is normal:

? Refer to the wiring diagram and verify whether or not there is a common connector between battery positive terminal and electric parking brake switch terminal K.

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.

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.

Replace the electric parking brake switch.

(See ELECTRIC PARKING BRAKE SWITCH REMOVAL/INSTALLATION.)

INSPECT ELECTRIC PARKING BRAKE CONTROL MODULE CONNECTOR CONDITION

• Switch the ignition OFF.

• Disconnect the negative battery terminal.

(See NEGATIVE BATTERY TERMINAL DISCONNECTION/CONNECTION.)

• Disconnect the electric parking brake control module 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.

Repair or replace the connector.

INSPECT ELECTRIC PARKING BRAKE SWITCH CIRCUIT FOR SHORT TO GROUND

• Verify that the electric parking brake switch and electric parking brake control module connectors are disconnected.

• Inspect for continuity between electric parking brake switch terminal L (wiring harness-side) and body ground.

• Is there continuity?

Yes

Refer to the wiring diagram and verify whether or not there is a common connector between electric parking brake switch terminal L and electric parking brake control module terminal 1R.

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 ground.

• Repair or replace the malfunctioning part.

If there is no common connector:

• Repair or replace the wiring harness which has a short to ground.

Go to the next step.

INSPECT ELECTRIC PARKING BRAKE SWITCH CIRCUIT FOR OPEN CIRCUIT

• Verify that the electric parking brake switch and electric parking brake control module connectors are disconnected.

• Inspect the wiring harness for continuity between electric parking brake switch terminal L (wiring harness-side) and electric parking brake control module terminal 1R (wiring harness-side).

• Is there continuity?

Yes

Replace the electric parking brake control module.

(See ELECTRIC PARKING BRAKE CONTROL MODULE REMOVAL/INSTALLATION.)

Refer to the wiring diagram and verify whether or not there is a common connector between electric parking brake switch terminal L and electric parking brake control module terminal 1R.

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.