VSC Off Indicator Light Circuit

BRAKE CONTROL: VEHICLE STABILITY CONTROL SYSTEM: VSC OFF Indicator Light Circuit

VSC OFF Indicator Light Circuit

DESCRIPTION

The skid control ECU detects malfunctions in the VSC system. When the VSC system's operation is stopped by the skid control ECU, the ECU informs the driver by blinking the VSC OFF indicator light. When the VSC OFF switch is pressed for a short time, TRAC operation is prohibited, and the combination meter's slip indicator light illuminates. When the vehicle is stopped and the VSC OFF switch is pressed for 3 seconds or more, VSC and TRAC system operations are prohibited, and the combination meter's VSC OFF light illuminates. With the system in TRAC OFF mode through the VSC OFF switch, if the vehicle speed becomes high, TRAC operation is automatically changed to an operational state. If the system is in VSC OFF mode, VSC operation is not affected by vehicle speed.

WIRING DIAGRAM





INSPECTION PROCEDURE

PROCEDURE

1. CHECK FOR DTC
(a) Turn the ignition switch ON.
(b) Check that the VSC OFF indicator light turns on.
(c) Check for DTC Reading and Clearing Diagnostic Trouble Codes.

Result





B -- REPAIR CIRCUITS INDICATED BY OUTPUT
A -- Continue to next step.
2. INSPECT VSC OFF SWITCH




(a) Remove the VSC OFF switch.
(b) Measure the resistance of the switch.
Standard resistance:






NG -- REPLACE VSC OFF SWITCH
OK -- Continue to next step.
3. CHECK WIRE HARNESS (VSC OFF SWITCH - SKID CONTROL ECU AND BODY GROUND)




(a) Disconnect the V7 switch connector.
(b) Disconnect the S6 ECU connector.
(c) Measure the resistance of the wire harness side connectors.
Standard resistance:






NG -- REPAIR OR REPLACE HARNESS AND CONNECTOR
OK -- Continue to next step.
4. INSPECT SKID CONTROL ECU CONNECTOR CONNECTION
(a) Check that each ECU connector is properly installed.
OK:
Each ECU connector is properly installed.
NG -- CONNECT CONNECTOR TO ECU CORRECTLY
OK -- Continue to next step.
5. READ VALUE USING TECHSTREAM (IG VOLTAGE)
(a) Check the Data List for proper functioning of the IG voltage.

ABS/VSC/TRAC





Result





B -- REPLACE SKID CONTROL ECU
A -- Continue to next step.
6. CHECK WIRE HARNESS (SKID CONTROL ECU - BATTERY AND BODY GROUND)




(a) Disconnect the S5, S7 and S8 ECU connectors.
(b) Turn the ignition switch ON.
(c) Measure the voltage of the wire harness side connectors.
Standard voltage:





(d) Measure the resistance of the wire harness side connectors.
Standard resistance:






NG -- REPAIR OR REPLACE HARNESS AND CONNECTOR
OK -- Continue to next step.
7. CHECK MULTIPLEX COMMUNICATION SYSTEM (SKID CONTROL ECU - COMBINATION METER)
(a) Check for open and short circuits in the multiplex communication system between the skid control ECU and combination meter.
NG -- REPAIR OR REPLACE MULTIPLEX COMMUNICATION SYSTEM
OK -- Continue to next step.
8. CHECK COMBINATION METER (VSC OFF INDICATOR LIGHT)
(a) Check the combination meter Problem Symptoms Table.
NG -- REPAIR OR REPLACE COMBINATION METER
OK -- REPLACE SKID CONTROL ECU