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DTC U3000:54 [DSC HU/CM]

id040262013900

Outline

System malfunction location

Electric parking brake motor gear unit position learning not completed

Detection condition

•  After replacing the DSC HU/CM, it detects that the electric parking brake motor gear unit position learning was not implemented.

Fail-safe

Refer to “DTC Table” and “Fail-safe Function Malfunction Contents Table”.(See DTC TABLE [DSC HU/CM (E)].)

Possible cause

Caution

•  After replacing the DSC HU/CM, if the electric parking brake has never been operated/released, a DTC may be output. After replacing the DSC HU/CM, operate/release the electric parking brake and have the system learn the electric parking brake motor gear unit position.

•  DSC HU/CM internal malfunction

System wiring diagram

Not applicable

Connector diagram

Not applicable

System malfunction location	Electric parking brake motor gear unit position learning not completed
Detection condition	• After replacing the DSC HU/CM, it detects that the electric parking brake motor gear unit position learning was not implemented.
Fail-safe	Refer to “DTC Table” and “Fail-safe Function Malfunction Contents Table”.(See DTC TABLE [DSC HU/CM (E)].)
Possible cause	Caution • After replacing the DSC HU/CM, if the electric parking brake has never been operated/released, a DTC may be output. After replacing the DSC HU/CM, operate/release the electric parking brake and have the system learn the electric parking brake motor gear unit position. • DSC HU/CM internal malfunction
System wiring diagram	Not applicable
Connector diagram	Not applicable

Diagnostic Procedure

Step

Inspection

Results

Action

1

ELECTRIC PARKING BRAKE MOTOR GEAR UNIT POSITION LEARNING

•  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.

•  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, replace the DSC HU/CM and perform the repair completion verification.

(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

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.

Step	Inspection	Results	Action
1	ELECTRIC PARKING BRAKE MOTOR GEAR UNIT POSITION LEARNING • 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. • 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, replace the DSC HU/CM and perform the repair completion verification. (See DSC HU/CM REMOVAL/INSTALLATION [L.H.D. (E)].) (See DSC HU/CM REMOVAL/INSTALLATION [R.H.D.].)
1		No	Go to the next step.
Repair completion verification	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.
Repair completion verification		No	DTC troubleshooting completed.