VDC Off Indicator Light Does Not Go Off

Detecting condition: 

• Defective combination meter
• Defective CAN communication
• Defective VDC OFF switch

Trouble symptom: 

VDC OFF indicator light does not go off when starting the engine.

Wiring diagram: 

Vehicle dynamics control system Ref. to WIRING SYSTEM>VEHICLE DYNAMICS CONTROL SYSTEM>WIRING DIAGRAM .

Courtesy of SUBARU OF AMERICA, INC.

1. READ DTC  .

   Read the DTC of [Brake Control] using the Subaru Select Monitor. Ref. to BRAKE CONTROL (DIAGNOSTICS)>DIAGNOSTIC TROUBLE CODE (DTC) .

   Is DTC displayed?

   Yes:  Perform the diagnosis according to the DTC. Ref. to BRAKE CONTROL (DIAGNOSTICS)>DIAGNOSTIC TROUBLE CODE (DTC)>LIST .

   No:  Go to  2.

2. CHECK VDC OFF SWITCH  .

   Using the Subaru Select Monitor, read data of [OFF SW Signal] in the [Data Monitor] of [Brake Control] while the engine is running. Ref. to BRAKE CONTROL (DIAGNOSTICS)>DATA MONITOR .

   Does [OFF SW Signal] change according to operation of VDC OFF switch?

   Yes:  Go to  5.

   No:  Go to  3.

3. CHECK VDC OFF SWITCH  .

   Remove and check VDC OFF switch. Ref. to VEHICLE DYNAMICS CONTROL (VDC)>VDC OFF SWITCH>INSPECTION .

   Is the check result OK?

   Yes:  Go to  4.

   No:  Replace the VDC OFF switch. Ref. to VEHICLE DYNAMICS CONTROL (VDC)>VDC OFF SWITCH .

4. CHECK VDC OFF SWITCH CIRCUIT  .
   1. Disconnect the connector from the VDCCM & H/U.
   2. Measure the resistance between VDCCM & H/U connector and chassis ground.

      Connector & terminal 

      (B66) No. 41 - Chassis ground:

   Is the resistance less than 10 Ω?

   Yes:  Check the VDC OFF switch circuit.

   No:  Go to  5.

5. CHECK LAN SYSTEM  .

   Check the LAN system. Ref. to LAN SYSTEM (DIAGNOSTICS)>BASIC DIAGNOSTIC PROCEDURE .

   Is the check result OK?

   Yes:  Go to  6.

   No:  Perform the diagnosis for LAN system.

6. CHECK COMBINATION METER  .

   Check the combination meter. Ref. to COMBINATION METER (DIAGNOSTICS)>BASIC DIAGNOSTIC PROCEDURE .

   Is the check result OK?

   Yes:  Replace the VDCCM & H/U. Ref. to VEHICLE DYNAMICS CONTROL (VDC)>VDC CONTROL MODULE AND HYDRAULIC CONTROL UNIT (VDCCM & H/U) .

   No:  Replace the combination meter. Ref. to INSTRUMENTATION/DRIVER INFO>COMBINATION METER .