Toyota Avalon Service & Repair Manual: 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.

  • Vehicle Conditions:
    1. The driver door is closed.
    2. 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.

Click here

PROCEDURE

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.

  1. The shift lever is not in P or R.
  2. The vehicle is fully stopped and the driver is depressing the brake pedal.
  3. The driver is not depressing the accelerator pedal.
  4. 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.

NEXT

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

Tester Display

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

INSPECT METER / GAUGE SYSTEM

OK

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

Tester Display

Measurement Item

Control Range

Diagnostic Note

BH Operated Light

Brake hold operated indicator light

Indicator light OFF/ON

  • Observe combination meter assembly
  • Perform the Active Test with the vehicle stopped
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

Active Test Display

BH Operated Light

Data List Display

BH Operated Light

(b) Check the operating condition of the brake hold operated indicator light when operating it using the Techstream.

Result

Proceed to

Brake hold operated indicator light in the Data List does not change using the Active Test.

A

Brake hold operated indicator light in the Data List turns ON/OFF using the Active Test.

B

A

REPLACE BRAKE ACTUATOR ASSEMBLY

B

USE SIMULATION METHOD TO CHECK

    Brake Actuator Operation Sound is Loud during Initial Check

    Brake Hold Standby Indicator Light Circuit

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