Toyota Avalon (XX50) 2019-2022 Service & Repair Manual: Brake Hold Standby Indicator Light Circuit

Toyota Avalon (XX50) 2019-2022 Service & Repair Manual / Brake / Brake Control / Dynamic Control Systems / Electronically Controlled Brake System(for Gasoline Model) / 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:
    1. The driver door is closed.
    2. The driver seat belt is fastened.
    3. 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.

Click here

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.

  1. The driver door is closed.
  2. The driver seat belt is fastened.
  3. The system is normal.
NEXT

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

CHECK CAN COMMUNICATION SYSTEM

A

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
OK

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

INSPECT METER / GAUGE SYSTEM

OK

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

B

6.

INSPECT ELECTRIC PARKING BRAKE SWITCH ASSEMBLY

(a) Turn the engine switch off.

*a

Component without harness connected

(Brake Hold Switch (Electric Parking Brake Switch Assembly))

(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

REPLACE ELECTRIC PARKING BRAKE SWITCH ASSEMBLY

OK

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
    Brake Hold Operated Indicator Light Circuit

    Brake Warning Light does not Come ON

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