Toyota Corolla Cross: Brake Warning Light (Yellow) Remains On
DESCRIPTION
This procedure is for troubleshooting when the brake system warning light (yellow indicator) remains on but no DTCs are output.
The skid control ECU (brake actuator assembly) controls the brake system warning light (yellow indicator) in the combination meter assembly via CAN communication.
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.
- After replacing the skid control ECU (brake actuator assembly), perform
acceleration sensor zero point calibration and store system information
memorization.
Click here
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- 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 ON.
PROCEDURE
|
1. |
CHECK VEHICLE CONTROL HISTORY (RoB) (ELECTRIC PARKING BRAKE SYSTEM) |
(a) Using the GTS, check for Vehicle Control History (RoB).
Click here
|
Tester Display |
|---|
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Vehicle Control History (RoB) |
HINT:
If vehicle control history (RoB) is stored when the electric parking brake system is suspended, the brake system warning light (yellow indicator) illuminates.
|
Result |
Proceed to |
|---|---|
|
There is no vehicle control history (RoB) for when the electric parking brake system was suspended. |
A |
|
There is vehicle control history (RoB) for when the electric parking brake system was suspended. |
B |
| B | .gif)
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PERFORM TROUBLESHOOTING AND REPAIR REGARDING VEHICLE CONTROL HISTORY (RoB) NOTICE: After performing troubleshooting and repair regarding vehicle control history (RoB), clear the vehicle control history (RoB). |
|
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2. |
INSPECT COMBINATION METER ASSEMBLY (BRAKE SYSTEM WARNING LIGHT (YELLOW INDICATOR)) |
(a) Perform the Active Test of the combination meter assembly using the GTS.
Click here
|
Tester Display |
|---|
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ECB Warning |
(b) Check the combination meter assembly.
OK:
The brake system warning light (yellow indicator) turns on or off in accordance with GTS operation.
| OK |
|
REPLACE SKID CONTROL ECU (BRAKE ACTUATOR ASSEMBLY) |
| NG |
|
INSPECT METER / GAUGE SYSTEM |
READ NEXT:
Electric Parking Brake System AUTO Function Circuit
DESCRIPTION
The skid control ECU (brake actuator assembly) receives shift
position signals from the TCM via CAN communication to control the electric parking
brake system AUTO function (shift-lin
Precaution
PRECAUTION
TROUBLESHOOTING PRECAUTIONS
(a) When inspecting the rear brakes, disconnect the connector or
disconnect the cable from the negative (-) auxiliary battery terminal in order to
shut off
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