| Last Modified: 04-05-2023 | 6.11:8.1.0 | Doc ID: RM1000000018KFE |
| Model Year Start: 2018 | Model: Sienna | Prod Date Range: [11/2017 - ] |
| Title: BRAKE CONTROL / DYNAMIC CONTROL SYSTEMS: VEHICLE STABILITY CONTROL SYSTEM: VSC OFF Switch Circuit; 2018 - 2020 MY Sienna [11/2017 - ] | ||
|
VSC OFF Switch Circuit |
DESCRIPTION
The skid control ECU (brake actuator assembly) is connected to the combination meter assembly via CAN communication.
Pressing the VSC OFF switch turns off TRAC operation and pressing and holding this switch turns off TRAC and VSC operation. If TRAC and VSC operations are turned off, the TRAC OFF message will be displayed on the multi-information display and the VSC OFF indicator light will come on.
WIRING DIAGRAM
CAUTION / NOTICE / HINT
NOTICE:
When replacing the skid control ECU (brake actuator assembly), perform zero point calibration and store system information (See page
![2018 - 2020 MY Sienna [11/2017 - ]; BRAKE CONTROL / DYNAMIC CONTROL SYSTEMS: VEHICLE STABILITY CONTROL SYSTEM: CALIBRATION](/t3Portal/stylegraphics/info.gif)
).
PROCEDURE
|
1. |
CHECK CAN COMMUNICATION SYSTEM |
(a) Check if CAN communication system DTCs are output (See page
).
|
Result |
Proceed to |
|---|---|
|
DTCs are not output. |
A |
|
DTCs are output. |
B |
| B |
|
|
|
2. |
CHECK IF BRAKE ACTUATOR ASSEMBLY CONNECTOR IS SECURELY CONNECTED |
(a) Check if the skid control ECU (brake actuator assembly) connector is securely connected.
OK:
The connector is securely connected.
| NG |
|
CONNECT CONNECTOR TO BRAKE ACTUATOR ASSEMBLY CORRECTLY |
|
|
3. |
READ VALUE USING TECHSTREAM (TRAC/VSC OFF MODE) |
(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 /Data List.
(e) Select the Data List using the Techstream (See page
).
ABS/VSC/TRAC
|
Tester Display |
Measurement Item/Range |
Normal Condition |
Diagnostic Note |
|---|---|---|---|
|
TRAC/VSC Off Mode |
TRAC/VSC off mode / Normal, TRC OFF, VSC Expert Mode or VSC OFF |
Normal: Normal mode TRC OFF: TRAC off mode VSC Expert Mode: VSC expert mode VSC OFF: VSC off mode |
- |
(f) Check that the indicator light and mode condition on the Techstream change according to VSC OFF switch operation.
Standard
|
Switch Operation |
Mode Condition Display |
Multi-information Display (TRAC OFF Message) |
VSC OFF Indicator Light |
|---|---|---|---|
|
Not pressed |
Normal |
Not displayed |
Does not come on |
|
Pressing the VSC OFF switch |
TRAC OFF |
Displayed |
Does not come on |
|
Pressing and holding the VSC OFF switch |
VSC OFF |
Displayed |
Comes on |
|
Result |
Proceed to |
|---|---|
|
Indicator light and mode condition display do not change. |
A |
|
Mode condition display is normal, but indicator light does not change. |
B |
|
Indicator light and mode condition display are normal. |
C |
| B |
|
| C |
|
|
|
4. |
PERFORM ACTIVE TEST USING TECHSTREAM (MULTI-INFORMATION DISPLAY (TRAC OFF MESSAGE) AND VSC OFF INDICATOR LIGHT) |
(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 /Data List.
(e) Select the Active Test on the Techstream (See page
).
ABS/VSC/TRAC
|
Tester Display |
Measurement Item |
Control Range |
Diagnostic Note |
|---|---|---|---|
|
TRC(TRAC) OFF Indicator Light |
Multi-information display (TRAC OFF message) |
Display (message) ON/OFF |
Can be observed on the combination meter assembly |
|
VSC OFF Indicator Light |
VSC OFF indicator light |
Indicator light ON/OFF |
Can be observed on the combination meter assembly |
(f) Check the multi-information display (TRAC OFF message) and VSC OFF indicator light on the combination meter assembly turn ON or OFF in accordance with the Techstream operation.
OK:
The multi-information display (TRAC OFF message) and VSC OFF indicator light turn ON or OFF in accordance with the Techstream operation.
| NG |
|
|
|
5. |
INSPECT VSC OFF SWITCH |
|
(a) Turn the ignition switch off. |
|
(b) Disconnect the D142 VSC OFF switch connector.
(c) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
|
Tester Connection |
Condition |
Specified Condition |
|---|---|---|
|
6 (+) - 3 (E) |
Switch pushed |
Below 1 Ω |
|
6 (+) - 3 (E) |
Switch not pushed |
10 kΩ or higher |
Text in Illustration
|
*a |
Component without harness connected (VSC OFF Switch) |
| NG |
|
|
|
6. |
CHECK HARNESS AND CONNECTOR (BRAKE ACTUATOR ASSEMBLY - VSC OFF SWITCH) |
(a) Disconnect the A75 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 |
|---|---|---|
|
A75-33 (CSW) - D142-6 (+) |
Always |
Below 1 Ω |
|
A75-33 (CSW) or D142-6 (+) - Body ground |
Always |
10 kΩ or higher |
|
D142-3 (E) - Body ground |
Always |
Below 1 Ω |
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 parts (See page
).
| OK |
|
| NG |
|
REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
7. |
INSPECT COMBINATION METER ASSEMBLY |
(a) Turn the ignition switch off.
(b) Perform Active Test of the combination meter assembly using the Techstream (See page
).
(c) Check the combination meter assembly.
OK:
The multi-information display and VSC OFF indicator light turn on or off in accordance with Techstream operation.
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 parts (See page
).
| OK |
|
| NG |
|
|
|