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.
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.
- Electronically controlled brake system
- Electric parking brake system
- Hybrid control system
|
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|
2. |
READ VALUE USING GTS (BRAKE HOLD READY) |
(a) Operate the GTS to read the Data List.
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 indicator not illuminated) Stand-by mode: Brake hold function stand-by state (brake hold indicator illuminated) |
- |
|
Tester Display |
|---|
|
Brake Hold Ready |
(b) 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 |
Comes 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 |
(a) Turn the ignition switch off.
(b) Inspect the brake hold switch (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) - A151-44 (HZRI) |
Always |
Below 1 Ω |
|
I257-10 (+B) or A151-44 (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 |
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Before replacing the main body ECU (mult
