| Last Modified: 11-29-2007 | 1.6 J | |
| Service Category: Brake | Section: Brake Control/Dynamic Control System | |
| Model Year: 2008 | Model: Sequoia | Doc ID: RM000000XG400XX |
| Title: BRAKE CONTROL / DYNAMIC CONTROL SYSTEMS: VEHICLE STABILITY CONTROL SYSTEM: DESCRIPTION (2008 Sequoia) | ||
|
Skid Control Buzzer Circuit |
DESCRIPTION
During VSC operation, the skid control buzzer sounds.
When performing a sensor check in test mode, the buzzer sounds when some of the sensor checks are completed. When a brake pad is overheated, the buzzer sounds as a warning.
WIRING DIAGRAM
INSPECTION PROCEDURE
NOTICE:
When replacing the VSC actuator assembly, perform zero point calibration
.
PROCEDURE
|
1. |
PERFORM ACTIVE TEST USING TECHSTREAM (SKID CONTROL BUZZER) |
(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 skid control buzzer using the Techstream.
ABS/VSC/TRAC
|
Tester Display |
Test Part |
Control Range |
Diagnostic Note |
|---|---|---|---|
|
Buzzer |
Skid control buzzer |
Buzzer ON/OFF |
Buzzer can be heard |
(e) 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 |
|
|
2. |
INSPECT SKID CONTROL BUZZER (POWER SOURCE TERMINAL) |
|
(a) Disconnect the H5 buzzer connector. |
(b) Turn the ignition switch to ON.
(c) Measure the voltage according to the value(s) in the table below.
Standard Voltage:
|
Tester Connection |
Switch Condition |
Specified Condition |
|---|---|---|
|
H5-1 - Body ground |
Ignition switch ON |
11 to 14 V |
|
|
3. |
INSPECT SKID CONTROL BUZZER |
|
(a) Disconnect the H5 buzzer connector. |
(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:
Skid control buzzer sounds.
|
|
4. |
CHECK HARNESS AND CONNECTOR (SKID CONTROL ECU - SKID CONTROL BUZZER) |
|
(a) Disconnect the A19 ECU connector. |
(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
|
Tester Connection |
Condition |
Specified Condition |
|---|---|---|
|
A19-8 (BZ) - H5-2 |
Always |
Below 1 Ω |
|
A19-8 (BZ) - Body ground |
Always |
10 kΩ or higher |
|
|
5. |
CHECK HARNESS AND CONNECTOR (SKID CONTROL ECU - BODY GROUND) |
|
(a) Disconnect the A19 ECU connector. |
(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
|
Tester Connection |
Condition |
Specified Condition |
|---|---|---|
|
A19-1 (GND1) - Body ground |
Always |
Below 1 Ω |
|
|
|