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

Toyota CH-R Service Manual / Parking Brake / Electric Parking Brake System / 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

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.

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

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