| Last Modified: 08-21-2023 | 6.11:8.1.0 | Doc ID: RM100000001AZ9O |
| 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 Operated Indicator Light Circuit; 2019 - 2021 MY Avalon [04/2018 - 08/2021] | ||
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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 operation is finished (brake fluid pressure decreases).
The brake hold system may not operate depending on vehicle conditions even when the system is in standby mode and the brake hold standby indicator light is illuminated.
If there is a system malfunction that causes brake hold control to be prohibited, when the vehicle is under the following conditions and the brake hold switch (electric parking brake switch assembly) is pressed, the brake hold operated indicator light blinks.
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Vehicle Conditions:
- The driver door is closed.
- The driver seat belt is fastened.
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) Check that the brake hold standby indicator light operates normally.
(b) If the brake hold operated indicator light does not illuminate even though the brake hold standby indicator light is illuminated, check that the following brake hold operation (brake fluid pressure is being maintained ) conditions are met.
- The shift lever is not in P or R.
- The vehicle is fully stopped and the driver is depressing the brake pedal.
- The driver is not depressing the accelerator pedal.
- The vehicle is not on a steep incline.
HINT:
When a malfunction occurs in the brake control system, the brake hold operated indicator light blinks.
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2. |
INSPECT COMBINATION METER ASSEMBLY |
(a) Enter the following menus: Body Electrical / Combination Meter / Active Test.
(b) Perform the Active Test of the combination meter assembly using the Techstream.
Body Electrical > Combination Meter > Active Test
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Tester Display |
|---|
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Hold Indicator |
(c) Check the combination meter assembly.
OK:
The brake hold operated indicator light turns on or off in accordance with the Techstream operation.
| NG |
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3. |
PERFORM ACTIVE TEST USING TECHSTREAM (BRAKE HOLD OPERATED INDICATOR LIGHT) |
(a) Enter the following menus: Chassis / ABS/VSC/TRAC/EPB / Active Test.
Chassis > ABS/VSC/TRAC/EPB > Active Test
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Tester Display |
Measurement Item |
Control Range |
Diagnostic Note |
|---|---|---|---|
|
BH Operated Light |
Brake hold operated indicator light |
Indicator light OFF/ON |
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Chassis > ABS/VSC/TRAC/EPB > Data List
|
Tester Display |
Measurement Item |
Range |
Normal Condition |
Diagnostic Note |
|---|---|---|---|---|
|
BH Operated Light |
Brake hold operated indicator light |
ON or OFF |
ON: Indicator light on OFF: Indicator light off |
- |
Chassis > ABS/VSC/TRAC/EPB > Active Test
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Active Test Display |
|---|
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BH Operated Light |
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Data List Display |
|---|
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BH Operated Light |
(b) Check the operating condition of the brake hold operated indicator light when operating it using the Techstream.
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Result |
Proceed to |
|---|---|
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Brake hold operated indicator light in the Data List does not change using the Active Test. |
A |
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Brake hold operated indicator light in the Data List turns ON/OFF using the Active Test. |
B |
| A |
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REPLACE BRAKE ACTUATOR ASSEMBLY
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| B |
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