| Last Modified: 07-31-2024 | 6.11:8.1.0 | Doc ID: RM100000001NX6W |
| Model Year Start: 2021 | Model: Corolla | Prod Date Range: [04/2020 - 09/2022] |
| Title: PARKING BRAKE: ELECTRIC PARKING BRAKE SYSTEM (for HV Model): C13B4; EPB Switch Malfunction; 2021 - 2022 MY Corolla Corolla HV [04/2020 - 09/2022] | ||
|
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 |
|
|
DTC stored |
An electric parking brake system malfunction is displayed on the multi-information display. |
DTC Detection Conditions: C13B4
|
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](/t3Portal/stylegraphics/info.gif)
| NG |
|
REPLACE ELECTRIC PARKING BRAKE SWITCH (ELECTRIC PARKING BRAKE SWITCH ASSEMBLY) |
|
|
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 |
|
|
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 |
|
| B |
|
|
|