Toyota CH-R Service Manual: EPB Switch Malfunction (C13B4)

DESCRIPTION

When the electric parking brake switch is pulled, a lock request signal is sent from the skid control ECU (brake actuator assembly) to the parking brake actuator assembly. When the electric parking brake switch is pushed, a release request signal is sent from the skid control ECU (brake actuator assembly) to the parking brake actuator assembly.

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

Memory

Note

C13B4

EPB Switch Malfunction

  • Parking brake switch power supply voltage from the +BS terminal less than 7 V for 1 second or more
  • Parking brake switch open or short circuit is detected for 0.3 seconds or more
  • Parking brake switch stuck malfunction
  • Electric parking brake switch (electric parking brake switch 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.

DTC Detection Conditions
 

Vehicle Condition

Pattern 1

Pattern 2

Pattern 3

Pattern 4

Diagnosis Condition

-

-

-

-

-

Malfunction Status

Parking brake switch power supply voltage from the +BS terminal less than 7 V

-

-

-

Parking brake switch open circuit is detected

-

-

-

Parking brake switch short circuit is detected

-

-

-

Parking brake switch stuck malfunction

-

-

-

Detection Time

1 second or more

0.3 seconds or more

0.3 seconds or more

-

Number of Trips

1 trip

1 trip

1 trip

1 trip

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 (red) blinks when the ignition switch is first turned to ON.

PROCEDURE

1.

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

2.

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

3.

CHECK DTC

(a) Clear the DTCs.

Click here

Chassis > ABS/VSC/TRAC/EPB > Clear DTCs

(b) Turn the ignition switch off.

(c) Turn the ignition switch to ON.

(d) Check for DTCs.

Click here

Chassis > ABS/VSC/TRAC/EPB > Trouble Codes

Result

Proceed to

DTCs are output

A

DTCs are not output

B

A

REPLACE SKID CONTROL ECU (BRAKE ACTUATOR ASSEMBLY)

B

USE SIMULATION METHOD TO CHECK

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