Toyota Avalon Service & Repair Manual: Brake Control Warning Light does not Come ON

DESCRIPTION

The skid control ECU (brake booster with master cylinder assembly) is connected to the combination meter assembly via CAN communication.

CAUTION / NOTICE / HINT

NOTICE:

After replacing the skid control ECU (brake booster with master cylinder assembly), perform linear solenoid valve offset learning, ABS holding solenoid valve learning, yaw rate and acceleration sensor zero point calibration and system information memorization after performing "Reset Memory".

Click here

PROCEDURE

1.

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

INSPECT CAN COMMUNICATION SYSTEM

A

2.

PERFORM ACTIVE TEST USING TECHSTREAM (BRAKE WARNING LIGHT / YELLOW (MINOR MALFUNCTION))

(a) Select the Active Test on the Techstream.

Click here

Chassis > ABS/VSC/TRAC > Active Test

Tester Display

Measurement Item

Control Range

Diagnostic Note

ECB Warning Light

Brake warning light / yellow (minor malfunction)

Warning light ON/OFF

  • Observe combination meter assembly
  • ECB: Electronically Controlled Brake System
Chassis > ABS/VSC/TRAC > Data List

Tester Display

Measurement Item

Range

Normal Condition

Diagnostic Note

ECB Warning Light

Brake warning light / yellow (minor malfunction)

ON or OFF

ON: Warning light on

OFF: Warning light off

ECB: Electronically Controlled Brake System

Chassis > ABS/VSC/TRAC > Active Test

Active Test Display

ECB Warning Light

Data List Display

ECB Warning Light

(b) Check the operating condition of the brake warning light / yellow (minor malfunction) when operating it using the Techstream.

Result

Proceed to

Brake warning light / yellow (minor malfunction) in the Data List does not change using the Active Test.

A

Brake warning light / yellow (minor malfunction) in the Data List turns ON/OFF using the Active Test.

B

A

REPLACE BRAKE BOOSTER WITH MASTER CYLINDER ASSEMBLY

B

3.

INSPECT COMBINATION METER ASSEMBLY

(a) Perform the Active Test of the combination meter assembly (meter CPU) using the Techstream.

Click here

Body Electrical > Combination Meter > Active Test

Tester Display

ECB Warning

(b) Check the combination meter assembly.

OK:

The brake warning light / yellow (minor malfunction) turns on or off in accordance with Techstream operation.

OK

REPLACE BRAKE BOOSTER WITH MASTER CYLINDER ASSEMBLY

NG

INSPECT METER / GAUGE SYSTEM

    Brake Actuator Operation Sound is Loud during Initial Check

    Brake Control Warning Light Remains ON

    See More:

    Toyota Avalon Service & Repair Manual > Dynamic Radar Cruise Control System(for Hv Model): Parts Location
    PARTS LOCATION ILLUSTRATION *1 FORWARD RECOGNITION CAMERA *2 BRAKE BOOSTER WITH MASTER CYLINDER ASSEMBLY - SKID CONTROL ECU *3 MILLIMETER WAVE RADAR SENSOR ASSEMBLY - - ILLUSTRATION *1 AIRBAG SENSOR ASSEMBLY - YAW RATE AND ACCELERATION SENSOR *2 MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU) *3 STOP LIG ...

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