VSC OFF Indicator Light Circuit: Wiring Diagram

Fig 1: VSC OFF Indicator Light Circuit Wiring Diagram

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

HINT:

When using the intelligent tester, start from *1. When not using the intelligent tester, start from *2.

1. PERFORM ACTIVE TEST BY INTELLIGENT TESTER (VSC OFF INDICATOR)*1 
   1. Select the ACTIVE TEST, generate a control command, and then check that the VSC OFF indicator light operates.

   Skid control ECU 

   ACTIVE TEST REFERENCE CHART
   
   

   Item	Vehicle Condition / Test Details	Diagnostic Note
   VSC/ TRC OFF IND	Turn VSC/TRC OFF indicator ON / OFF	Observe combination meter

   OK : VSC OFF indicator turns on or off. 

   NG : Go to step   3 

   OK : Go To Next Step 

2. CHECK FOR DTC 
   1. Turn the ignition switch ON.
   2. Check that the VSC TRAC warning light illuminates.
   3. Check if the same DTCs are recorded.

   Result: 

   RESULT REFERENCE
   
   

   Result	Proceed to
   DTC is not output	A
   DTC is output	B

   B : REPAIR CIRCUIT INDICATED BY OUTPUT DTC 

   A : Go To Next Step 

3. CHECK WARNING LIGHT 
   1. Check the warning lights other than VSC OFF indicator light.

      OK : Go to step  5

      NG : Go To Next Step 

4. INSPECT RELAY (Marking: IG1 NO. 2) 
   1. Remove the IG1 NO. 2 relay from the cowl side junction block LH.
   2. Measure the resistance of the relay.

   Standard resistance 

   TESTER CONNECTION AND SPECIFIED CONDITION CHART
   
   

   Tester Connection	Specified Condition
   1 - 2	10 kΩ or higher
   1 - 2	Below 1 Ω (when battery voltage is applied to terminals 3 and 4)

   NG : REPLACE RELAY 

   Fig 2: Identifying Relay Connector Terminals

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   OK : CHECK COMBINATION METER (COMBINATION METER CIRCUIT) 

5. CHECK VSC OFF INDICATOR LIGHT 
   1. Check for open circuit in the combination meter circuit.

      NG : REPLACE COMBINATION METER 

      OK : Go To Next Step 

6. CHECK WIRE HARNESS (SKID CONTROL ECU ASSEMBLY - VSC OFF INDICATOR LIGHT) 

   NG : REPAIR OR REPLACE HARNESS AND CONNECTOR 

   OK : Go To Next Step 

7. INSPECT CENTER DIFFERENTIAL SWITCH 
   1. Check the center differential switch (INSPECTION ).

      NG : REPLACE CENTER DIFFERENTIAL SWITCH 

      OK : Go To Next Step 

8. CHECK WIRE HARNESS (CENTER DIFFERENTIAL SWITCH - BODY GROUND) 

   NG : REPAIR OR REPLACE HARNESS AND CONNECTOR 

   OK : REPLACE SKID CONTROL ECU ASSEMBLY