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DTC C1128:2A [DSC HU/CM]

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Outline

System malfunction location	Electric parking brake switch
Detection condition	•  While the vehicle is stopped, the DSC HU/CM detects that the activate operation or release operation of the electric parking brake switch continues for 60 s or more.
Fail-safe	Refer to “DTC Table” and “Fail-safe Function Malfunction Contents Table”.(See DTC TABLE [DSC HU/CM (E)].)
Possible cause	Caution •  When the electric parking brake switch is continuously pulled up/pressed down for a long period, DTCs may be detected. Therefore, always verify that DTCs being detected are due to how the customer has operated the switch. •  Electric parking brake switch malfunction ―  Electric parking brake switch is mechanically stuck •  DSC HU/CM malfunction
System wiring diagram	Not applicable
Connector diagram	Not applicable

Diagnostic Procedure

Step	Inspection	Results	Action
1	VERIFY OPERATION CONDITION OF ELECTRIC PARKING BRAKE SWITCH BY CUSTOMER •  Verify if the customer did the following operation. ―  While vehicle is stopped, electric parking brake switch is pulled up/pressed down continuously for 60 s or more •  Is the operation applicable to the customer?	Yes	System is normal. (Explain to the customer that it is not necessary to continuously pull up/press down the electric parking brake switch to operate/release the electric parking brake system.)
		No	Go to the next step.
2	VISUALLY INSPECT ELECTRIC PARKING BRAKE SWITCH FOR MALFUNCTION •  Visually verify the electric parking brake switch for the following. ―  Interference with surrounding parts ―  Foreign matter penetration in movable parts •  Is the electric parking brake switch normal?	Yes	Go to the next step.
		No	Interference with surrounding parts: •  Install the electric parking brake switch correctly. (See ELECTRIC PARKING BRAKE SWITCH REMOVAL/INSTALLATION.) ―  If the malfunction recurs, replace the electric parking brake switch and perform the repair completion verification. (See ELECTRIC PARKING BRAKE SWITCH REMOVAL/INSTALLATION.) Foreign matter has penetrated movable parts: •  Remove the foreign matter and perform the repair completion verification.
Repair completion verification 1	VERIFY THAT VEHICLE IS REPAIRED •  Install/connect the part removed/disconnected during the troubleshooting procedure. •  Clear the DTC recorded in the memory. (See CLEARING DTC.) •  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. •  Perform the DTC inspection for the DSC HU/CM. (See DTC INSPECTION.) •  Is the same Pending DTC present?	Yes	Refer to the controller area network (CAN) malfunction diagnosis flow to inspect for a CAN communication error. (See CONTROLLER AREA NETWORK (CAN) MALFUNCTION DIAGNOSIS FLOW [(E)].) If the CAN communication is normal, perform the diagnosis from Step 1. •  If the malfunction recurs, replace the DSC HU/CM, then go to the next step. (See DSC HU/CM REMOVAL/INSTALLATION [L.H.D. (E)].) (See DSC HU/CM REMOVAL/INSTALLATION [R.H.D.].)
		No	Go to the next step.
Repair completion verification 2	VERIFY IF OTHER DTCs DISPLAYED •  Perform the DTC inspection. (See DTC INSPECTION.) •  Are any DTCs displayed?	Yes	Repair the malfunctioning location according to the applicable DTC troubleshooting.
		No	DTC troubleshooting completed.