Last Modified: 05-13-2024 6.11:8.1.0 Doc ID: RM100000001G904
Model Year Start: 2020 Model: Corolla Prod Date Range: [01/2019 - 04/2020]
Title: PARKING BRAKE: ELECTRIC PARKING BRAKE SYSTEM (for HV Model): C13B4; EPB Switch Malfunction; 2020 MY Corolla Corolla HV [01/2019 - 04/2020]

DTC

C13B4

EPB Switch Malfunction

DESCRIPTION

When the electric parking brake switch is pulled, a lock request signal is sent from the parking brake 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 parking brake 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

for before December 2019

  • Parking brake switch open or short circuit is detected for 1 second or more
  • Parking brake switch stuck malfunction

for from January 2020

  • Open or short detected in parking brake switch circuit for 1 second or more
  • Stuck parking brake switch detected (when parked: 30 seconds, when driving: 1 second, during engine stall: 1 second)
  • Stuck parking brake switch detected 3 times in succession when being operated
  • Electric parking brake switch (electric parking brake switch assembly)
  • Wire harness or connector
  • Parking brake ECU (brake actuator assembly)

DTC stored

An electric parking brake system malfunction is displayed on the multi-information display.

DTC Detection Conditions: C13B4 (for before December 2019)

 

Vehicle Condition

Pattern 1

Pattern 2

Pattern 3

Diagnosis Condition

-

-

-

-

Malfunction Status

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

1 second or more

-

Number of Trips

1 trip

1 trip

1 trip

HINT:

DTC will be output when conditions for either of the patterns in the table above are met.

DTC Detection Conditions: C13B4 (for from January 2020)

 

Vehicle Condition

Pattern 1

Pattern 2

Pattern 3

Pattern 4

Pattern 5

Pattern 6

Diagnosis Condition

Vehicle is stopped

-

-

○

-

-

-

Vehicle is being driven

-

-

-

○

-

-

During initial check

-

-

-

-

○

-

Parking brake switch is being operated

-

-

-

-

-

○

Malfunction Status

Open detected in parking brake switch circuit

○

-

-

-

-

-

Short detected in parking brake switch circuit

-

○

-

-

-

-

Stuck parking brake switch detected

-

-

○

○

○

○

Detection Time

1 second or more

1 second or more

30 seconds or more

1 second or more

1 second or more

-

Number of Trips

1 trip

1 trip

1 trip

1 trip

1 trip

3 trip

HINT:

DTC will be output when conditions for either of the patterns in the table above are met.

WIRING DIAGRAM

CAUTION / NOTICE / HINT

NOTICE:

  • The electric parking brake may still operate up to 20 seconds after the power switch is turned off. Before disconnecting connectors or fuses, turn the power switch off and wait 20 seconds or more.
  • After replacing the parking brake ECU (brake actuator assembly), the parking brake indicator light (red) blinks when the power switch is turned on (IG) for the first time. To turn off the parking brake indicator light (red) after replacing the parking brake ECU (brake actuator assembly), operate the electric parking brake switch to the lock side then to the release side.

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 2019 - 2022 MY Corolla Corolla Hatchback Corolla HV GR Corolla [06/2018 - 09/2022]; PARKING BRAKE: ELECTRIC PARKING BRAKE SWITCH: INSPECTION

NG

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

OK

2.

CHECK HARNESS AND CONNECTOR (PARKING BRAKE ECU (BRAKE ACTUATOR ASSEMBLY) - ELECTRIC PARKING BRAKE SWITCH (ELECTRIC PARKING BRAKE SWITCH ASSEMBLY))

(a) Disconnect the I41 electric parking brake switch (electric parking brake switch assembly) connector.

(b) Disconnect the A113 parking brake 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

A113-14 (SWI1) - I41-7 (SWI1)

Always

Below 1 Ω

A113-20 (SWO1) - I41-8 (SWO1)

Always

Below 1 Ω

A113-24 (SWI2) - I41-1 (SWI2)

Always

Below 1 Ω

A113-22 (SWO2) - I41-2 (SWO2)

Always

Below 1 Ω

A113-14 (SWI1) or I41-7 (SWI1) - Body ground

Always

10 kΩ or higher

A113-20 (SWO1) or I41-8 (SWO1) - Body ground

Always

10 kΩ or higher

A113-24 (SWI2) or I41-1 (SWI2) - Body ground

Always

10 kΩ or higher

A113-22 (SWO2) or I41-2 (SWO2) - Body ground

Always

10 kΩ or higher
NG

REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

3.

CHECK DTC

(a) Clear the DTCs.

Chassis > Electric Parking Brake > Clear DTCs

(b) Turn the power switch off.

(c) Turn the power switch on (IG).

(d) Check for DTCs.

Chassis > Electric Parking Brake > Trouble Codes

Result

Proceed to

DTCs are output

A

DTCs are not output

B
A

REPLACE PARKING BRAKE ECU (BRAKE ACTUATOR ASSEMBLY)

B

USE SIMULATION METHOD TO CHECK