DTC C1128:0A [ELECTRIC PARKING BRAKE]

id040257250700

Description

Electric parking brake switch circuit malfunction

Detection condition

•  Electric parking brake control module detects an electric parking brake switch circuit malfunction.

Fail-safe

•  Not applicable

Possible cause

•  Electric parking brake switch connector or terminal malfunction

•  Electric parking brake switch malfunction

•  Electric parking brake switch power supply circuit malfunction

―  Short to ground in wiring harness between battery positive terminal and electric parking brake switch terminal K

―  SUNROOF 10 fuse malfunction

―  CABIN.+B 50A fuse malfunction

―  MAIN 200 A fuse malfunction

―  Open circuit in wiring harness between battery positive terminal and electric parking brake switch terminal K

•  Electric parking brake control module connector or terminal malfunction

•  Short to power supply in wiring harness between electric parking brake switch terminal L and electric parking brake control module terminal O

•  Electric parking brake control module malfunction

Description	Electric parking brake switch circuit malfunction
Detection condition	• Electric parking brake control module detects an electric parking brake switch circuit malfunction.
Fail-safe	• Not applicable
Possible cause	• Electric parking brake switch connector or terminal malfunction • Electric parking brake switch malfunction • Electric parking brake switch power supply circuit malfunction ― Short to ground in wiring harness between battery positive terminal and electric parking brake switch terminal K ― SUNROOF 10 fuse malfunction ― CABIN.+B 50A fuse malfunction ― MAIN 200 A fuse malfunction ― Open circuit in wiring harness between battery positive terminal and electric parking brake switch terminal K • Electric parking brake control module connector or terminal malfunction • Short to power supply in wiring harness between electric parking brake switch terminal L and electric parking brake control module terminal O • Electric parking brake control module malfunction

Diagnostic Procedure

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 (WITHOUT i-stop)].) (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION [SKYACTIV-G 2.0, SKYACTIV-G 2.5].) (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION [SKYACTIV-D 2.2].) • 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 6.
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 6. (See ELECTRIC PARKING BRAKE SWITCH REMOVAL/INSTALLATION.)
3	VERIFY ELECTRIC PARKING BRAKE SWITCH POWER SUPPLY VOLTAGE • Connect the negative battery cable. (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION [SKYACTIV-G 2.0, SKYACTIV-G 2.5 (WITHOUT i-stop)].) (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION [SKYACTIV-G 2.0, SKYACTIV-G 2.5].) (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION [SKYACTIV-D 2.2].) • Measure the voltage at the electric parking brake switch terminal K (wiring harness-side). • Is the voltage B+?	Yes	Go to the next step.
3		No	Inspect the SUNROOF 10 A fuse, CABIN.+50A 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. Go to Step 6.
4	INSPECT ELECTRIC PARKING BRAKE CONTROL MODULE 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 (WITHOUT i-stop)].) (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION [SKYACTIV-G 2.0, SKYACTIV-G 2.5].) (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION [SKYACTIV-D 2.2].) • 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.
4		No	Repair or replace the connector, then go to Step 6.
5	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 (WITHOUT i-stop)].) (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION [SKYACTIV-G 2.0, SKYACTIV-G 2.5].) (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION [SKYACTIV-D 2.2].) • Switch the ignition ON (engine off or on). • Measure the voltage at the electric parking brake switch terminal L (wiring harness-side). • Is the voltage 0 V?	Yes	Go to the next step.
5		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 O. 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 the next step.
6	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 (WITHOUT i-stop)].) (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION [SKYACTIV-G 2.0, SKYACTIV-G 2.5].) (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION [SKYACTIV-D 2.2].) • 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.
6		No	Go to the next step.
7	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].)
7		No	DTC troubleshooting completed.