| Last Modified: 05-13-2024 | 6.11:8.1.0 | Doc ID: RM100000001CW4B |
| Model Year Start: 2019 | Model: GR Corolla | Prod Date Range: [06/2018 - 09/2022] |
| Title: PARKING BRAKE: ELECTRIC PARKING BRAKE SYSTEM (for Gasoline Model): Electric Parking Brake does not Operate; 2019 - 2022 MY Corolla Corolla Hatchback GR Corolla [06/2018 - 09/2022] | ||
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Electric Parking Brake does not Operate |
WIRING DIAGRAM
CAUTION / NOTICE / HINT
NOTICE:
- The electric parking brake may still operate up to 20 seconds after the engine switch is turned off. Before disconnecting connectors or fuses, turn the engine switch off and wait 20 seconds or more.
- Inspect the fuses for circuits related to this system before performing the following procedure.
-
After replacing the skid control ECU (brake actuator assembly), perform acceleration sensor zero point calibration and store system information memorization.
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![2019 - 2022 MY Corolla Corolla Hatchback GR Corolla [06/2018 - 09/2022]; BRAKE CONTROL / DYNAMIC CONTROL SYSTEMS: ELECTRONICALLY CONTROLLED BRAKE SYSTEM (for Gasoline Model with Electric Parking Brake System): UTILITY](/t3Portal/stylegraphics/info.gif)
- When replacing the skid control ECU (brake actuator assembly), operate the electric parking brake switch assembly as the parking brake indicator light blinks (red) when the engine switch is first turned on (IG).
HINT:
Even if the electric parking brake is operating normally, the parking brake indicator light (red) on the combination meter may be malfunctioning.
PROCEDURE
|
1. |
CHECK CAN COMMUNICATION SYSTEM |
(a) Check if CAN communication system DTCs are output.
Chassis > Brake/EPB > Trouble Codes
|
Result |
Proceed to |
|---|---|
|
DTCs are not output |
A |
|
DTCs are output |
B |
| B |
|
|
|
2. |
VEHICLE OPERATION CHECK |
(a) With the wheels not contacting the ground, check the condition of the rear wheels when the electric parking brake is operating and not operating.
Click here
|
Result |
Proceed to |
|---|---|
|
Lock and release operation is normal and parking brake indicator light turns off or blinks (red) |
A |
|
Lock and release operation is malfunctioning and parking brake indicator light illuminates (red) or turns off according to switch operation |
B |
|
Lock and release operation is malfunctioning and parking brake indicator light turns off or blinks (red) |
C |
| B |
|
INSPECT REAR BRAKE |
| C |
|
|
|
3. |
INSPECT COMBINATION METER ASSEMBLY |
(a) Perform the Active Test of the combination meter assembly using the Techstream.
Body Electrical > Combination Meter > Active Test
|
Tester Display |
|---|
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Indicat. Park |
(b) Check the combination meter assembly.
OK:
Parking brake indicator light (red) turns on or off in accordance with Techstream operation.
| OK |
|
REPLACE SKID CONTROL ECU (BRAKE ACTUATOR ASSEMBLY)
|
| NG |
|
|
4. |
CHECK HARNESS AND CONNECTOR (+BS TERMINAL VOLTAGE) |
(a) Turn the engine switch off.
(b) Disconnect the A51 skid control ECU (brake actuator assembly) connector.
|
(c) Measure the voltage according to the value(s) in the table below. Standard Voltage:
|
|
| NG |
|
REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
|
5. |
CHECK HARNESS AND CONNECTOR (IG1 TERMINAL VOLTAGE) |
(a) Turn the engine switch off.
(b) Disconnect the A51 skid control ECU (brake actuator assembly) connector.
|
(c) Measure the voltage according to the value(s) in the table below. Standard Voltage:
|
|
| OK |
|
REPLACE SKID CONTROL ECU (BRAKE ACTUATOR ASSEMBLY)
|
| NG |
|
REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
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