ELECTRIC PARKING BRAKE CANNOT BE RELEASED [ELECTRIC PARKING BRAKE]

id040328250800

Note

• If it is necessary to move the vehicle as in an emergency, perform the electric parking brake forced release. (See ELECTRIC PARKING BRAKE FORCED RELEASE PROCEDURE.)

Outline

Description

The electric parking brake cannot be released even though the electric parking brake release operation has been performed.

Possible cause

•  Electric parking brake operation malfunction (if there is a malfunction in electric parking brake, electronically controlled brake unit detects DTC)

•  Rear brake sticking (rear disc plates are held even though electric parking brake motor gear unit operates release operation)

System wiring diagram

•  Not applicable

Connector diagram

•  Not applicable

Diagnostic Procedure

Step

Inspection

Results

Action

1

VERIFY SYSTEM DTCs

•  Switch the main power OFF.

•  Switch the main power ON (READY off or on) and wait for 10 s or more.

•  Perform a Quick Check using the M-MDS.
(See DTC INSPECTION.)

•  Are any DTCs displayed?

Yes

Repair the malfunctioning location according to the applicable DTC troubleshooting.

(See DTC TABLE [ELECTRONICALLY CONTROLLED BRAKE UNIT].)

Perform the repair completion verification.

No

Inspect the rear brake for sticking and repair or replace the malfunctioning location.

(See REAR BRAKE DISC REMOVAL/INSTALLATION.)

(See REAR BRAKE CALIPER DISASSEMBLY/ASSEMBLY.)

Perform the repair completion verification.

Repair completion verification

VERIFY IF MALFUNCTION CAUSE IS CORRECTED

•  Install/connect the part removed/disconnected during the troubleshooting procedure.

•  Has the malfunction symptom been eliminated?

Yes

Complete the symptom troubleshooting.

Explain repair contents to customer.

No

Refer to the CAN (controller area network) malfunction diagnosis flow to inspect for a CAN communication error.

(See CONTROLLER AREA NETWORK (CAN) MALFUNCTION DIAGNOSIS FLOW [L.H.D. (E)].)

(See CONTROLLER AREA NETWORK (CAN) MALFUNCTION DIAGNOSIS FLOW [R.H.D.].)

If the CAN communication is normal, perform the diagnosis from Step 1.

Description	The electric parking brake cannot be released even though the electric parking brake release operation has been performed.
Possible cause	• Electric parking brake operation malfunction (if there is a malfunction in electric parking brake, electronically controlled brake unit detects DTC) • Rear brake sticking (rear disc plates are held even though electric parking brake motor gear unit operates release operation)
System wiring diagram	• Not applicable
Connector diagram	• Not applicable

Step	Inspection	Results	Action
1	VERIFY SYSTEM DTCs • Switch the main power OFF. • Switch the main power ON (READY off or on) and wait for 10 s or more. • Perform a Quick Check using the M-MDS. (See DTC INSPECTION.) • Are any DTCs displayed?	Yes	Repair the malfunctioning location according to the applicable DTC troubleshooting. (See DTC TABLE [ELECTRONICALLY CONTROLLED BRAKE UNIT].) Perform the repair completion verification.
1		No	Inspect the rear brake for sticking and repair or replace the malfunctioning location. (See REAR BRAKE DISC REMOVAL/INSTALLATION.) (See REAR BRAKE CALIPER DISASSEMBLY/ASSEMBLY.) Perform the repair completion verification.
Repair completion verification	VERIFY IF MALFUNCTION CAUSE IS CORRECTED • Install/connect the part removed/disconnected during the troubleshooting procedure. • Has the malfunction symptom been eliminated?	Yes	Complete the symptom troubleshooting. Explain repair contents to customer.
Repair completion verification		No	Refer to the CAN (controller area network) malfunction diagnosis flow to inspect for a CAN communication error. (See CONTROLLER AREA NETWORK (CAN) MALFUNCTION DIAGNOSIS FLOW [L.H.D. (E)].) (See CONTROLLER AREA NETWORK (CAN) MALFUNCTION DIAGNOSIS FLOW [R.H.D.].) If the CAN communication is normal, perform the diagnosis from Step 1.