DTC C1128:4A [ELECTRIC PARKING BRAKE]

id040257251000

Description

Electric parking brake switch circuit malfunction
Detection condition
•  Electric parking brake control module detects an open circuit in the electric parking brake switch circuit.
Fail-safe
•  The electric parking brake control module operates the electric parking brake under any of the following conditions while the vehicle is stopped.
?  Ignition is switched ON (engine off or on) and selector lever is in P or N position
?  Ignition is switched ON (engine off or on) and driver's door is open from closed condition
?  Ignition is switched off and brake pedal is depressed
?  Ignition is switched off and driver's door is open
Possible cause
•  Electric parking brake switch connector or terminal malfunction
•  Electric parking brake switch malfunction
•  Electric parking brake control module connector or terminal malfunction
•  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 terminal.
•  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, then go to Step 4.
2
INSPECT ELECTRIC PARKING BRAKE SWITCH
•  Inspect the electric parking brake switch.
•  Is the electric parking brake switch normal?
Yes
Go to the next step.
No
Replace the electric parking brake switch, then go to Step 4.
(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.
No
Repair or replace the connector, then go to Step 4.
4
VERIFY THAT REPAIRS HAVE BEEN COMPLETED
•  Always reconnect all disconnected connectors.
•  Connect the negative battery terminal.
•  Clear the DTC for the electric parking brake control module using the M-MDS.
•  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.
•  Is the same DTC displayed?
Yes
Repeat the inspection from Step 1.
•  If the malfunction recurs, replace the electric parking brake control module.
Go to the next step.
No
Go to the next step.
5
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].)
No
DTC troubleshooting completed.