| Last Modified: 08-21-2023 | 6.11:8.1.0 | Doc ID: RM100000001AZ9N |
| Model Year Start: 2019 | Model: Avalon | Prod Date Range: [04/2018 - 08/2021] |
| Title: BRAKE CONTROL / DYNAMIC CONTROL SYSTEMS: ELECTRONICALLY CONTROLLED BRAKE SYSTEM (for Gasoline Model): Brake Hold Standby Indicator Light Circuit; 2019 - 2021 MY Avalon [04/2018 - 08/2021] | ||
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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 engine switch is on (IG).
-
Conditions required for operation standby:
- The driver door is closed.
- The driver seat belt is fastened.
- The system is normal.
WIRING DIAGRAM
CAUTION / NOTICE / HINT
NOTICE:
When replacing the skid control ECU (brake actuator assembly), perform system variant learning and acceleration sensor zero point calibration.
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![2019 - 2021 MY Avalon [04/2018 - 08/2021]; BRAKE CONTROL / DYNAMIC CONTROL SYSTEMS: ELECTRONICALLY CONTROLLED BRAKE SYSTEM (for Gasoline Model): CALIBRATION](/t3Portal/stylegraphics/info.gif)
PROCEDURE
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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.
|
|
2. |
CHECK CAN COMMUNICATION SYSTEM |
(a) Check if CAN communication system DTCs are output.
Click here
|
Result |
Proceed to |
|---|---|
|
DTCs are not output |
A |
|
DTCs are output |
B |
| B |
|
|
|
3. |
CHECK IF BRAKE ACTUATOR ASSEMBLY CONNECTOR IS SECURELY CONNECTED |
(a) Check if the skid control ECU (brake actuator assembly) connector is securely connected.
OK:
The connector is securely connected.
| NG |
|
CONNECT CONNECTOR TO BRAKE ACTUATOR ASSEMBLY CORRECTLY |
|
|
4. |
INSPECT COMBINATION METER ASSEMBLY |
(a) Turn the engine switch off.
(b) Enter the following menus: Body Electrical / Combination Meter / Active Test.
(c) Perform the Active Test of the combination meter assembly using the Techstream.
Body Electrical > Combination Meter > Active Test
|
Tester Display |
|---|
|
Brake Hold Indicator |
(d) Check the combination meter assembly.
OK:
The brake hold standby indicator light turns on or off in accordance with the Techstream operation.
| NG |
|
|
|
5. |
PERFORM ACTIVE TEST USING TECHSTREAM (BRAKE HOLD STANDBY INDICATOR LIGHT) |
(a) Enter the following menus: Chassis / ABS/VSC/TRAC/EPB / Active Test.
Chassis > ABS/VSC/TRAC/EPB > Active Test
|
Tester Display |
Measurement Item |
Control Range |
Diagnostic Note |
|---|---|---|---|
|
BH Standby Light |
Brake hold standby indicator light |
Indicator light OFF/ON |
Observe combination meter assembly Vehicle condition: Vehicle stopped |
Chassis > ABS/VSC/TRAC/EPB > Data List
|
Tester Display |
Measurement Item |
Range |
Normal Condition |
Diagnostic Note |
|---|---|---|---|---|
|
BH Standby Light |
Brake hold standby indicator light |
ON or OFF |
ON: Indicator light on OFF: Indicator light off |
- |
Chassis > ABS/VSC/TRAC/EPB > Active Test
|
Active Test Display |
|---|
|
BH Standby Light |
|
Data List Display |
|---|
|
BH Standby Light |
(b) Check the operating condition of the brake hold standby indicator light when operating it using the Techstream.
|
Result |
Proceed to |
|---|---|
|
Brake hold standby indicator light in the Data List does not change using the Active Test. |
A |
|
Brake hold standby indicator light in the Data List turns ON/OFF using the Active Test. |
B |
| A |
|
REPLACE BRAKE ACTUATOR ASSEMBLY
|
|
|
6. |
INSPECT ELECTRIC PARKING BRAKE SWITCH ASSEMBLY |
|
(a) Turn the engine switch off. |
|
(b) Make sure that there is no looseness at the locking part and the connecting part of the connector.
OK:
The connector is securely connected.
(c) Disconnect the G24 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 |
|---|---|---|
|
8 (+B) - 16 (GND1) |
Switch pushed |
Below 1 Ω |
|
8 (+B) - 16 (GND1) |
Switch not pushed |
10 kΩ or higher |
| NG |
|
|
|
7. |
CHECK HARNESS AND CONNECTOR (BRAKE ACTUATOR ASSEMBLY - ELECTRIC PARKING BRAKE SWITCH 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 A28 skid control ECU (brake actuator assembly) connector.
(c) Check both the connector case and the terminal for deformation and corrosion.
OK:
No deformation or corrosion.
(d) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
|
Tester Connection |
Condition |
Specified Condition |
|---|---|---|
|
A28-43 (HZRI) - G24-8 (+B) |
Always |
Below 1 Ω |
|
A28-43 (HZRI) or G24-8 (+B) - Body ground |
Always |
10 kΩ or higher |
|
G24-16 (GND1) - Body ground |
Always |
Below 1 Ω |
| OK |
|
REPLACE BRAKE ACTUATOR ASSEMBLY
|
| NG |
|
REPAIR OR REPLACE HARNESS OR CONNECTOR |
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