VSC OFF Switch Circuit [09/2024 - ]: Procedure
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- READ VALUE USING GTS (TRAC/VSC OFF MODE)
- Check that the indicator light and mode condition on the GTS change according to VSC OFF switch (combination switch assembly) operation.
Chassis > Brake/EPB > Data List
Tester Display Measurement Item Range Normal Condition Diagnostic Note TRC (TRAC)/VSC OFF Mode TRAC/VSC off mode Normal mode (TRC (TRAC) ON/VSC ON) / TRC (TRAC) OFF mode (TRC (TRAC) OFF/VSC ON) / VSC expert mode (VSC expert mode MID ON) / VSC OFF mode (TRC (TRAC) OFF/VSC OFF) Normal mode (TRC (TRAC) ON/VSC ON): Normal mode
TRC (TRAC) OFF mode (TRC (TRAC) OFF/VSC ON): TRAC off mode
VSC expert mode (VSC expert mode MID ON): VSC expert mode
VSC OFF mode (TRC (TRAC) OFF/VSC OFF): VSC off mode- Chassis > Brake/EPB > Data List
Tester Display TRC (TRAC)/VSC OFF Mode Standard
Switch Operation Mode Condition Display TRAC OFF Indicator Light VSC OFF Indicator Light Not pressed Normal mode (TRC (TRAC) ON/VSC ON) Does not come on Does not come on Pressing the VSC OFF switch (combination switch assembly) TRC (TRAC) OFF mode (TRC (TRAC) OFF/VSC ON) Comes on Does not come on Pressing and holding the VSC OFF switch (combination switch assembly) VSC OFF mode (TRC (TRAC) OFF/VSC OFF) Comes on Comes on Result
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
Result:
B
INSPECT METER / GAUGE SYSTEM
Refer to HOW TO PROCEED WITH TROUBLESHOOTING [11/2022 - ]
Result:
C
USE SIMULATION METHOD TO CHECK
Refer to HOW TO PROCEED WITH TROUBLESHOOTING [06/2018 - ]
Result:
A
See step 2
- Check that the indicator light and mode condition on the GTS change according to VSC OFF switch (combination switch assembly) operation.
- INSPECT COMBINATION SWITCH ASSEMBLY
- Turn the ignition switch off.
- Inspect the VSC OFF switch (combination switch assembly).
Refer to INSPECTION [09/2022 - ]
OK
The VSC OFF switch (combination switch assembly) is normal.
Result
Proceed to OK NG
Result:
NG
REPLACE COMBINATION SWITCH ASSEMBLY
Refer to REMOVAL [09/2024 - ]
Result:
OK
See step 3
- CHECK HARNESS AND CONNECTOR (BRAKE ACTUATOR ASSEMBLY - COMBINATION SWITCH ASSEMBLY)
- Make sure that there is no looseness at the locking part and the connecting part of the connectors.
OK
The connector is securely connected.
- Disconnect the A140 skid control ECU (brake actuator assembly) connector.
- Check both the connector case and the terminals for deformation and corrosion.
OK
No deformation or corrosion.
- Measure the resistance according to the value(s) in the table below.
Standard Resistance
Tester Connection Condition Specified Condition A140-9 (CSW) - I177-8 (+) Always Below 1 Ω A140-9 (CSW) or I177-8 (+) - Body ground Always 10 kΩ or higher I177-5 (E) - Body ground 1 minute or more after disconnecting the cable from the negative (-) battery terminal Below 1 Ω Result
Proceed to OK NG
Result:
OK
REPLACE BRAKE ACTUATOR ASSEMBLY
Refer to REMOVAL [09/2024 - ]
Result:
NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
- Make sure that there is no looseness at the locking part and the connecting part of the connectors.