Toyota Tacoma manuals

Toyota Tacoma 2015-2018 Service Manual: VSC Buzzer Circuit

DESCRIPTION

The skid control ECU (brake actuator assembly) is connected to the combination meter via CAN communication.

The combination meter has a built-in VSC warning buzzer:

  • Sounds intermittently to inform the driver if the temperature of brake actuator assembly has increased excessively due to continuous operation of AUTO LSD.
  • Sounds intermittently to inform the driver that the VSC is operating.

WIRING DIAGRAM

CAUTION / NOTICE / HINT

CAUTION / NOTICE / HINT

NOTICE:

When replacing the skid control ECU (brake actuator assembly), perform the zero point calibration (See page ). PROCEDURE ).

PROCEDURE

1.

CHECK CAN COMMUNICATION LINE

(a) Turn the ignition switch off.

(b) Connect the Techstream to the DLC3.

(c) Turn the ignition switch to ON.

(d) Turn the Techstream on.

(e) Select CAN Bus Check from the System Selection Menu screen and follow the prompts on the screen to inspect the CAN bus (See page OK: OK: ).

OK:

CAN Bus Check indicates no malfunctions in CAN communication.

NG

GO TO CAN COMMUNICATION SYSTEM (HOW TO PROCEED WITH TROUBLESHOOTING)

OK

2.

PERFORM ACTIVE TEST USING TECHSTREAM (BUZZER)

(a) Connect the Techstream to the DLC3.

(b) Turn the ignition switch to ON.

(c) Turn the Techstream on.

(d) Enter the following menus: Chassis / ABS/VSC/TRAC / Active Test.

(e) According to the display on the tester, perform the Active Test.

ABS/VSC/TRAC

Tester Display

Test Part

Control Range

Diagnostic Note

Buzzer

VSC warning buzzer

Buzzer OFF/ON

The buzzer can be heard

(f) Check that the buzzer sounds or stops in accordance with the Techstream.

Result

Result

Proceed to

Buzzer does not sound or stop

A

Buzzer sounds and stops

B

B

CHECK FOR INTERMITTENT PROBLEMS (SYMPTOM SIMULATION)

A

3.

REPLACE COMBINATION METER ASSEMBLY

(a) Turn the ignition switch off.

(b) Replace the combination meter (See page ). ).

NEXT

4.

PERFORM ACTIVE TEST USING TECHSTREAM (BUZZER)

(a) Connect the Techstream to the DLC3.

(b) Turn the ignition switch to ON.

(c) Turn the Techstream on.

(d) Enter the following menus: Chassis / ABS/VSC/TRAC / Active Test.

(e) According to the display on the tester, perform the Active Test.

ABS/VSC/TRAC

Tester Display

Test Part

Control Range

Diagnostic Note

Buzzer

VSC warning buzzer

Buzzer OFF/ON

The buzzer can be heard

(f) Check that the buzzer sounds or stops in accordance with the Techstream.

Result

Result

Proceed to

Buzzer does not sound or stop

A

Buzzer sounds and stops

B

A

REPLACE BRAKE ACTUATOR ASSEMBLY

B

END

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