Toyota CH-R Service Manual: Open or Short Circuit in Motor (C13A6)

Toyota CH-R Service Manual / Parking Brake / Electric Parking Brake System / Open or Short Circuit in Motor (C13A6)

DESCRIPTION

DTC No.	Detection Item	DTC Detection Condition	Trouble Area	Memory	Note
C13A6	Open or Short Circuit in Motor	Parking brake actuator assembly open or short circuit is detected for 0.015 seconds or more.	Parking brake actuator assembly Wire harness or connector Skid control ECU (brake actuator assembly)	DTC stored	An electric parking brake system malfunction is displayed on the multi-information display.

WIRING DIAGRAM

CAUTION / NOTICE / HINT

NOTICE:

The electric parking brake may still operate up to 20 seconds after the ignition switch is turned off. Before disconnecting connectors or fuses, turn the ignition switch off and wait 20 seconds or more.
When replacing the skid control ECU (brake actuator assembly), operate the electric parking brake switch (electric parking brake switch assembly) as the parking brake indicator light blinks (red) when the ignition switch is first turned to ON.

PROCEDURE

1.	READ VALUE USING TECHSTREAM (PERMISSION OF RH INTERLOCKING PKB LOCK / PERMISSION OF LH INTERLOCKING PKB LOCK)

(a) Turn the ignition switch off.

(b) Connect the Techstream to the DLC3.

(d) Turn the Techstream on.

(e) Enter the following menus: Chassis / Electric Parking Brake / Data List.

(f) Read the Data List according to the display on the Techstream.

Chassis > ABS/VSC/TRAC/EPB > Data List

Tester Display	Measurement Item	Range	Normal Condition	Diagnostic Note
Permission of RH Interlocking PKB Lock	Parking brake actuator assembly RH parking brake lock control permission status	OK or NG	-	-
Permission of LH Interlocking PKB Lock	Parking brake actuator assembly LH parking brake lock control permission status	OK or NG	-	-

Chassis > ABS/VSC/TRAC/EPB > Data List

Tester Display
Permission of RH Interlocking PKB Lock
Permission of LH Interlocking PKB Lock

2.	INSPECT PARKING BRAKE WIRE ASSEMBLY

*a	Front view of Parking Brake Wire Assembly	*b	(to wire harness connector)
*c	(to Parking Brake Actuator Assembly)	*d	for RH
*e	for LH	-	-

(a) Remove the parking brake wire assembly.

Click here

(b) Check the parking brake wire assembly for damage.

OK:

No damage.

HINT:

If damaged, there may be a short in the wire harness or a short to ground.

Standard Resistance:

for RH

Tester Connection	Condition	Specified Condition
dM3-2 (MRR-) - d2-1 (MRR-)	Always	Below 1 Ω
dM3-2 (MRR-) - d2-2 (MRR+)	Always	10 kΩ or higher
dM3-2 (MRR-) or d2-1 (MRR-) - Body ground	Always	10 kΩ or higher
dM3-1 (MRR+) - d2-2 (MRR+)	Always	Below 1 Ω
dM3-1 (MRR+) - d2-1 (MRR-)	Always	10 kΩ or higher
dM3-1 (MRR+) or d2-2 (MRR+) - Body ground	Always	10 kΩ or higher

for LH

Tester Connection	Condition	Specified Condition
eM3-2 (MRL-) - e2-1 (MRL-)	Always	Below 1 Ω
eM3-2 (MRL-) - e2-2 (MRL+)	Always	10 kΩ or higher
eM3-2 (MRL-) or e2-1 (MRL-) - Body ground	Always	10 kΩ or higher
eM3-1 (MRL+) - e2-2 (MRL+)	Always	Below 1 Ω
eM3-1 (MRL+) - e2-1 (MRL-)	Always	10 kΩ or higher
eM3-1 (MRL+) or e2-2 (MRL+) - Body ground	Always	10 kΩ or higher

REPLACE PARKING BRAKE WIRE ASSEMBLY

3.	CHECK HARNESS AND CONNECTOR (SKID CONTROL ECU (BRAKE ACTUATOR ASSEMBLY) - PARKING BRAKE ACTUATOR ASSEMBLY)

(a) Turn the ignition switch off.

(b) Make sure the parking brake wire assembly is securely installed.

(d) Disconnect the d2*1 or e2*2 parking brake actuator assembly connector.

*1: for RH
*2: for LH

(e) Measure the resistance according to the value(s) in the table below.

Standard Resistance:

for RH

Tester Connection	Condition	Specified Condition
A42-2 (MRR+) - d2-2 (MRR+)	Always	Below 1 Ω
A42-3 (MRR-) - d2-1 (MRR-)	Always	Below 1 Ω
A42-2 (MRR+) or d2-2 (MRR+) - Body ground	Always	10 kΩ or higher
A42-3 (MRR-) or d2-1 (MRR-) - Body ground	Always	10 kΩ or higher

for LH

Tester Connection	Condition	Specified Condition
A42-13 (MRL+) - e2-2 (MRL+)	Always	Below 1 Ω
A42-12 (MRL-) - e2-1 (MRL-)	Always	Below 1 Ω
A42-13 (MRL+) or e2-2 (MRL+) - Body ground	Always	10 kΩ or higher
A42-12 (MRL-) or e2-1 (MRL-) - Body ground	Always	10 kΩ or higher

REPAIR OR REPLACE HARNESS OR CONNECTOR

4.	INSPECT PARKING BRAKE ACTUATOR ASSEMBLY

(a) Inspect the parking brake actuator assembly.

Click here

REPLACE SKID CONTROL ECU (BRAKE ACTUATOR ASSEMBLY)

REPLACE PARKING BRAKE ACTUATOR ASSEMBLY

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