Toyota CH-R Service Manual: Electric Parking Brake System AUTO Function Circuit

DESCRIPTION

The skid control ECU (brake actuator assembly) receives shift position information from the ECM via CAN communication.

In addition, front seat inner belt information and driver seat door courtesy switch information is received from the main body ECU (multiplex network body ECU).

The electric parking brake system AUTO function (shift-linked function) automatically releases the parking brake when the following conditions are met: 1) Ignition switch to ON, 2) brake pedal is depressed, and 3) shift lever is moved out of P. When the shift lever is moved to P with these conditions met, the function automatically locks the parking brake.

The electric parking brake system AUTO (shift-linked function) automatically engages the parking brake when the shift lever is moved to P and disengages the parking brake when the shift lever is moved out of P when the ignition switch to ON and the brake pedal is depressed.

WIRING DIAGRAM

CAUTION / NOTICE / HINT

PROCEDURE

1.	CHECK CAN COMMUNICATION SYSTEM

(a) Check if CAN communication system DTCs are output.

Click here

Result	Proceed to
DTCs are not output	A
DTCs are output	B

B

GO TO CAN COMMUNICATION SYSTEM

A

2.	READ VALUE USING TECHSTREAM (AUTO MODE)

(a) Turn the ignition switch off.

(b) Connect the Techstream to the DLC3.

(c) Turn the ignition switch to ON.

(d) Turn the Techstream on.

(e) Enter the following menus: Chassis / ABS/VSC/TRAC/EPB / 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
Auto Mode	AUTO (shift-linked) mode permission status	ON or OFF	OFF: Manual mode ON: AUTO (shift-linked) mode	-

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

Tester Display
Auto Mode

(g) When switching the mode, check that the Data List display turns on and off.

Result	Proceed to
AUTO indicator light does not illuminate and turn off according to turning Active Test on and off	A
AUTO indicator light illuminates and turns off according to turning Active Test on and off	B

B

GO TO STEP 5

A

3.	INSPECT ELECTRIC PARKING BRAKE SWITCH (ELECTRIC PARKING BRAKE SWITCH ASSEMBLY)

(a) Inspect the electric parking brake switch (electric parking brake switch assembly).

Click here

NG

REPLACE ELECTRIC PARKING BRAKE SWITCH (ELECTRIC PARKING BRAKE SWITCH ASSEMBLY)

OK

4.	CHECK HARNESS AND CONNECTOR (SKID CONTROL ECU (BRAKE ACTUATOR ASSEMBLY) - ELECTRIC PARKING BRAKE SWITCH (ELECTRIC PARKING BRAKE SWITCH ASSEMBLY))

(a) Disconnect the F67 electric parking brake switch (electric parking brake switch assembly) connector.

(b) Disconnect the A42 skid control ECU (brake actuator assembly) connector.

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

Standard Resistance:

Tester Connection	Condition	Specified Condition
A42-31 (SWI1) - F67-6 (SWI1)	Always	Below 5 Ω
A42-32 (SWO1) - F67-5 (SWO1)	Always	Below 5 Ω
A42-15 (SWI2) - F67-4 (SWI2)	Always	Below 5 Ω
A42-16 (SWO2) - F67-3 (SWO2)	Always	Below 5 Ω
A42-31 (SWI1) or F67-6 (SWI1) - Body ground	Always	10 kΩ or higher
A42-32 (SWO1) or F67-5 (SWO1) - Body ground	Always	10 kΩ or higher
A42-15 (SWI2) or F67-4 (SWI2) - Body ground	Always	10 kΩ or higher
A42-16 (SWO2) or F67-3 (SWO2) - Body ground	Always	10 kΩ or higher

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

5.	READ VALUE USING TECHSTREAM (SHIFT POSITION)

(a) Turn the ignition switch off.

(b) Connect the Techstream to the DLC3.

(c) Turn the ignition switch to ON.

(d) Turn the Techstream on.

(e) Enter the following menus: Chassis / ABS/VSC/TRAC/EPB / 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
Shift Position	Shift lever position information	"P,N", R, D/M, 1st-6th/B or Fail	Actual shift lever position	-

OK:

On the Techstream screen, ON or OFF is displayed accordingly.

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

Tester Display
Shift Lever Position

NG

GO TO CONTINUOUSLY VARIABLE TRANSAXLE SYSTEM

OK

6.	READ VALUE USING TECHSTREAM (STOP LIGHT SW)

(a) Turn the ignition switch off.

(b) Connect the Techstream to the DLC3.

(c) Turn the ignition switch to ON.

(d) Turn the Techstream on.

(e) Enter the following menus: Chassis / ABS/VSC/TRAC/EPB / 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
Stop Light SW	Stop light switch	OFF or ON	ON: Brake pedal depressed OFF: Brake pedal released	-

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

Tester Display
Stop Light SW

OK:

On the Techstream screen, ON or OFF is displayed accordingly.

OK

REPLACE SKID CONTROL ECU (BRAKE ACTUATOR ASSEMBLY)

NG

7.	READ VALUE USING TECHSTREAM (DOOR COURTESY SW)

(a) Turn the ignition switch off.

(b) Connect the Techstream to the DLC3.

(c) Turn the ignition switch to ON.

(d) Turn the Techstream on.

(e) Enter the following menus: Body Electrical > Main Body > Data List

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

Body Electrical > Main Body > Data List

Tester Display	Measurement Item	Range	Normal Condition	Diagnostic Note
FL Door Courtesy SW	Front door courtesy light switch assembly LH	ON or OFF	ON: Front door LH open OFF: Front door LH closed	If this item does not change according to the actual state of the driver door, there is a malfunction in the door courtesy light switch or related part.

Body Electrical > Main Body > Data List

Tester Display
FL Door Courtesy SW

OK:

The Data List item changes in accordance with the opening and closing of the driver door.

NG

GO TO LIGHTING SYSTEM

OK

8.	READ VALUE USING TECHSTREAM (D SEAT BUCKLE SW)

(a) Turn the ignition switch off.

(b) Connect the Techstream to the DLC3.

(c) Turn the ignition switch to ON.

(d) Turn the Techstream on.

(e) Enter the following menus: Body Electrical > Main Body > Data List

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

Body Electrical > Main Body > Data List

Tester Display	Measurement Item	Range	Normal Condition	Diagnostic Note
D Seat Buckle SW	Driver seat belt buckle switch	OFF or ON	ON: Driver seat belt unfastened OFF: Driver seat belt fastened	-

Body Electrical > Main Body > Data List

Tester Display
D Seat Buckle SW

OK:

Unset or Set is displayed on the Techstream according to the driver seat belt condition.

OK

REPLACE SKID CONTROL ECU (BRAKE ACTUATOR ASSEMBLY)

NG

GO TO SEAT BELT WARNING SYSTEM