Last Modified: 04-05-2023 6.11:8.1.0 Doc ID: RM100000000VIV3
Model Year Start: 2016 Model: Sienna Prod Date Range: [12/2015 - 08/2016]
Title: BRAKE CONTROL / DYNAMIC CONTROL SYSTEMS: VEHICLE STABILITY CONTROL SYSTEM: Skid Control Buzzer Circuit; 2016 MY Sienna [12/2015 - 08/2016]

Skid Control Buzzer Circuit

DESCRIPTION

A buzzer sounds to alert the driver when the vehicle-to-vehicle distance becomes less than the set value (w/ dynamic radar cruise control system).

WIRING DIAGRAM

CAUTION / NOTICE / HINT

NOTICE:

  • When replacing the brake actuator assembly, perform zero point calibration and store system information (See page 2016 - 2017 MY Sienna [12/2015 - 11/2017]; BRAKE CONTROL / DYNAMIC CONTROL SYSTEMS: VEHICLE STABILITY CONTROL SYSTEM: CALIBRATION ).
  • Inspect the fuses for circuits related to this system before performing the following inspection procedure.

PROCEDURE

1.

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 Techstream, perform the Active Test.

ABS/VSC/TRAC

Tester Display

Test Part

Control Range

Diagnostic Note

Buzzer

Skid control buzzer

Buzzer ON/OFF

Buzzer can be heard

(f) Check that the buzzer sounds/stops when turning the skid control buzzer on/off by using the Techstream.

Result

Result

Proceed to

Buzzer does not sound or sounds constantly

A

Buzzer sounds/stops

B

HINT:

If troubleshooting has been carried out according to Problem Symptoms Table, refer back to the table and proceed to the next step (See page 2016 MY Sienna [12/2015 - 08/2016]; BRAKE CONTROL / DYNAMIC CONTROL SYSTEMS: VEHICLE STABILITY CONTROL SYSTEM: PROBLEM SYMPTOMS TABLE ).

B

END

A

2.

CHECK HARNESS AND CONNECTOR (POWER SOURCE TERMINAL)

(a) Turn the ignition switch off.

(b) Disconnect the skid control buzzer connector.

(c) Turn the ignition switch to ON.

(d) Measure the voltage according to the value(s) in the table below.

Standard Voltage:

Tester Connection

Switch Condition

Specified Condition

A21-2 - Body ground

Ignition switch ON

11 to 14 V

Text in Illustration

*a

Front view of wire harness connector

(to Skid Control Buzzer)

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR (POWER SOURCE CIRCUIT)

OK

3.

INSPECT SKID CONTROL BUZZER ASSEMBLY

(a) Turn the ignition switch off.

(b) Apply battery negative voltage to terminal 1, and battery positive voltage to terminal 2 of the skid control buzzer, and then check that the buzzer sounds.

OK:

The skid control buzzer sounds.

Text in Illustration

*a

Component without harness connected

(Skid Control Buzzer)

NG

REPLACE SKID CONTROL BUZZER ASSEMBLY

OK

4.

CHECK HARNESS AND CONNECTOR (BRAKE ACTUATOR ASSEMBLY - SKID CONTROL BUZZER ASSEMBLY)

(a) Disconnect the A4 skid control ECU (brake actuator assembly) connector.

(b) Measure the resistance according to the value(s) in the table below.

Standard Resistance:

Tester Connection

Condition

Specified Condition

A4-21 (BZ) - A51-1

Always

Below 1 Ω

A4-21 (BZ) or A51-1 - Body ground

Always

10 kΩ or higher

HINT:

If troubleshooting has been carried out according to Problem Symptoms Table, refer back to the table and proceed to the next step before replacing the part (See page 2016 MY Sienna [12/2015 - 08/2016]; BRAKE CONTROL / DYNAMIC CONTROL SYSTEMS: VEHICLE STABILITY CONTROL SYSTEM: PROBLEM SYMPTOMS TABLE ).

OK

REPLACE BRAKE ACTUATOR ASSEMBLY

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR