Diagnostic Procedure

DTC C1128:4A (ELECTRIC PARKING BRAKE CONTROL MODULE) DIAGNOSTIC PROCEDURE

Step	Inspection	Results	Action
1	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.
1		No	Repair or replace the connector, then go to Step 5.
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 5. (See ELECTRIC PARKING BRAKE SWITCH REMOVAL/INSTALLATION .)
3	INSPECT ELECTRIC PARKING BRAKE CONTROL MODULE CONNECTOR CONDITION 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.
3		No	Repair or replace the connector, then go to Step 5.
4	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 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 G-Electric parking brake control module terminal 2L Is there continuity?	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 G-Electric parking brake control module terminal 2L 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 the next step.
5	VERIFY THAT REPAIRS HAVE BEEN COMPLETED Always reconnect all disconnected connectors. Connect the negative battery terminal. (See NEGATIVE BATTERY TERMINAL DISCONNECTION/CONNECTION .) Clear the DTC for the electric parking brake control module using the M-MDS. (See CLEARING DTC [ELECTRIC PARKING BRAKE CONTROL MODULE] .) 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 CONTROL MODULE] .) 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.
5		No	Go to the next step.
6	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 CONTROL MODULE] .)
6		No	DTC troubleshooting completed.