Last Modified: 11-29-2007 1.6 J
Service Category: Brake Section: Brake Control/Dynamic Control System
Model Year: 2008 Model: Sequoia Doc ID: RM0000028G3005X
Title: BRAKE CONTROL / DYNAMIC CONTROL SYSTEMS: VEHICLE STABILITY CONTROL SYSTEM: WIRING DIAGRAM (2008 Sequoia)

VSC OFF Indicator Light does not Come ON

WIRING DIAGRAM

Refer to VSC OFF Indicator Light Remains ON BRAKE CONTROL / DYNAMIC CONTROL SYSTEMS: VEHICLE STABILITY CONTROL SYSTEM: DESCRIPTION (2008 Sequoia)+ .

INSPECTION PROCEDURE

NOTICE:

When replacing the VSC actuator assembly, perform zero point calibration BRAKE CONTROL / DYNAMIC CONTROL SYSTEMS: VEHICLE STABILITY CONTROL SYSTEM: CALIBRATION (2008 Sequoia) .

PROCEDURE

1.

CHECK CAN COMMUNICATION SYSTEM

(a) Check if a CAN communication system DTC is output NETWORKING: CAN COMMUNICATION SYSTEM: DIAGNOSIS SYSTEM (2008 Sequoia) .

Result

Result

Proceed to

DTC is not output

A

DTC is output

B
A

2.

CHECK CONNECTOR CONNECTION CONDITION

(a) Check the skid control ECU connector connection condition.

OK:

The connector is securely connected.

OK

3.

CHECK HARNESS AND CONNECTOR (SKID CONTROL ECU - BATTERY AND BODY GROUND)


(a) Disconnect the A19 ECU connector.

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

Standard Voltage:

Tester Connection

Switch Condition

Specified Condition

A19-9 (IG1) - Body ground

Ignition switch ON

11 to 14 V

Standard Resistance:

Tester Connection

Condition

Specified Condition

A19-1 (GND1) - Body ground

Always

Below 1 Ω
OK

4.

PERFORM ACTIVE TEST USING TECHSTREAM (VSC OFF INDICATOR LIGHT)

(a) Connect the Techstream to the DLC3.

(b) Turn the ignition switch to ON.

(c) Turn the Techstream ON.

(d) Select the Active Test mode and operate the VSC OFF indicator light using the Techstream.

ABS/VSC/TRAC

Tester Display

Test Part

Control Range

Diagnostic Note

VSC Warning Light

VSC OFF indicator light

Indicator light ON/OFF

Observe combination meter

(e) Check that the VSC OFF indicator light turns ON and OFF in the combination meter when using the Techstream.

OK:

The VSC OFF indicator light turns on and off in accordance with the Techstream operation.

OK

5.

INSPECT VSC OFF SWITCH

(a) Remove the VSC OFF switch BRAKE CONTROL / DYNAMIC CONTROL SYSTEMS: VSC OFF SWITCH: REMOVAL (2008 Sequoia) .

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

Standard Resistance:

Tester Connection

Switch Condition

Specified Condition

6 - 9

Switch is pressed

Below 1 Ω

Switch is not pressed

10 kΩ or higher
OK

6.

CHECK HARNESS AND CONNECTOR (SKID CONTROL ECU - VSC OFF SWITCH AND BODY GROUND)


(a) Disconnect the A19 ECU connector.

(b) Disconnect the H29 switch connector.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

A19-13 (CSW) - H29-9

Always

Below 1 Ω

A19-13 (CSW) - Body ground

Always

10 kΩ or higher

H29-6 - Body ground

Always

Below 1 Ω
OK