Toyota Corolla Cross: Brake Hold Standby Indicator Light Circuit
DESCRIPTION
The brake hold standby indicator light turns on if brake hold control is possible when the following conditions required for operation standby are met and the brake hold switch (electric parking brake switch assembly) is pressed while the ignition switch is ON.
- Conditions required for operation standby:
- The driver door is closed.
- The driver seat belt is fastened.
- The system is normal.
HINT:
If a malfunction occurs in one of the following systems, the brake hold operated indicator light will blink. If this occurs, perform troubleshooting on the malfunctioning system.
- Brake system
- Electric parking brake system
WIRING DIAGRAM
PROCEDURE
|
1. |
PRE-CHECK |
(a) If the brake hold standby indicator light does not illuminate even though the brake hold switch (electric parking brake switch assembly) is pushed, check that the brake hold function operation conditions are met.
- The driver door is closed.
- The driver seat belt is fastened.
- The system is normal.
HINT:
If a malfunction occurs in one of the following systems, the brake hold operated indicator light will blink. If this occurs, perform troubleshooting on the malfunctioning system.
- Brake system
- Electric parking brake system
|
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|
2. |
READ VALUE USING GTS (BRAKE HOLD READY) |
(a) Check the Data List using the GTS.
Chassis > Brake/EPB > Data List|
Tester Display |
Measurement Item |
Range |
Normal Condition |
Diagnostic Note |
|---|---|---|---|---|
|
Brake Hold Ready |
Brake hold control permission status |
Not in stand-by mode / Stand-by mode |
Not in stand-by mode: Brake hold function not operating (brake hold standby indicator light not illuminated) Stand-by mode: Brake hold function stand-by state (brake hold standby indicator light illuminated) |
- |
|
Tester Display |
|---|
|
Brake Hold Ready |
(b) All of the following brake hold operation conditions are met:
- The driver door is closed.
- The driver seat belt is fastened.
(c) Check the brake hold standby indicator light and mode condition on the GTS changes according to brake hold switch (electric parking brake switch assembly) operation.
Standard:
|
Brake Hold Switch (Electric Parking Brake Switch Assembly) Operation |
Mode Condition Display |
Brake Hold Standby Indicator Light |
|---|---|---|
|
Not pressed |
Not in stand-by mode |
Does not come on |
|
Pressing the brake hold switch (electric parking brake switch assembly) |
Stand-by mode |
come on |
|
Result |
Proceed to |
|---|---|
|
Indicator light and mode condition display do not change |
A |
|
Mode condition display is normal, but indicator light does not change |
B |
|
Indicator light and mode condition display are normal |
C |
| B | .gif)
|
INSPECT METER / GAUGE SYSTEM |
| C |
|
USE SIMULATION METHOD TO CHECK |
|
|
3. |
INSPECT ELECTRIC PARKING BRAKE SWITCH ASSEMBLY |
Click here .gif)
OK:
The brake hold switch (electric parking brake switch assembly) is normal.
| NG |
|
REPLACE ELECTRIC PARKING BRAKE SWITCH ASSEMBLY |
|
|
4. |
CHECK HARNESS AND CONNECTOR (ELECTRIC PARKING BRAKE SWITCH ASSEMBLY - BRAKE ACTUATOR ASSEMBLY) |
(a) Make sure that there is no looseness at the locking part and the connecting part of the connector.
OK:
The connector is securely connected.
(b) Disconnect the A151 skid control ECU (brake actuator assembly) connector.
(c) Disconnect the I257 brake hold switch (electric parking brake switch assembly) connector.
(d) Check both the connector case and the terminal for deformation and corrosion.
OK:
No deformation or corrosion.
(e) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
|
Tester Connection |
Condition |
Specified Condition |
|---|---|---|
|
I257-10 (+B) - A151-42 (HZRI) |
Always |
Below 1 Ω |
|
I257-10 (+B) or A151-42 (HZRI) - Body ground |
Always |
10 kΩ or higher |
|
I257-12 (E) - Body ground |
1 minute or more after disconnecting the cable from the negative (-) auxiliary battery terminal |
Below 1 Ω |
| OK |
|
REPLACE BRAKE ACTUATOR ASSEMBLY |
| NG |
|
REPAIR OR REPLACE HARNESS OR CONNECTOR |
READ NEXT:
Brake Hold Operated Indicator Light Circuit
DESCRIPTION
The brake hold operated indicator light illuminates when the
brake hold system is operating (vehicle stopped due to brake fluid pressure hold)
and turns off when the brake hold system
Slip Indicator Light Remains ON
DESCRIPTION
This procedure is for troubleshooting when the slip indicator
light remains on but no DTCs are output.
The skid control ECU (brake actuator assembly) controls the
slip indicator ligh
Slip Indicator Light does not Come ON
DESCRIPTION
The skid control ECU (brake actuator assembly) controls the
slip indicator light in the combination meter assembly via CAN communication.
PROCEDURE
1.
INSPECT C
SEE MORE:
System Description
SYSTEM DESCRIPTION
HEATED STEERING WHEEL SYSTEM
(a) The steering heater warms up the steering wheel when the steering heater
switch is turned on.
(b) The steering heater uses a control thermostat inside the steering wheel to
maintain the steering wheel at the specified temperature.
OPERATION
Precaution
PRECAUTION
HINT:
The following procedures are used to prevent wrinkles from forming when installing the seat cover. Make sure to follow the procedures correctly.
The shape of the seat shown in the illustration may differ from the actual seat.
SEAT COVER SET (a) Align the center c
