VDC Off Indicator Light Does Not Go Off

Detecting condition: 

• Defective combination meter
• Defective CAN communication
• VDC OFF switch is shorted.

Trouble symptom: 

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

Wiring diagram: 

• Models without EyeSight

  Vehicle dynamics control system. Refer to WIRING SYSTEM>VEHICLE DYNAMICS CONTROL SYSTEM>WIRING DIAGRAM>WITHOUT EYESIGHT .

  Courtesy of SUBARU OF AMERICA, INC.

• Models with EyeSight

  Vehicle dynamics control system. Refer to WIRING SYSTEM>VEHICLE DYNAMICS CONTROL SYSTEM>WIRING DIAGRAM>WITH EYESIGHT .

Courtesy of SUBARU OF AMERICA, INC.

1. READ DTC. 

   Read the DTC. Refer to VEHICLE DYNAMICS CONTROL (VDC) (DIAGNOSTICS)>READ DIAGNOSTIC TROUBLE CODE (DTC) .

   Is DTC displayed?

   Yes:  Perform the diagnosis according to DTC. Refer to VEHICLE DYNAMICS CONTROL (VDC) (DIAGNOSTICS)>LIST OF DIAGNOSTIC TROUBLE CODE (DTC) .

   No:  Go to  2.

2. CHECK VDC OFF SWITCH. 

   Connect the Subaru Select Monitor, and display the current data of VDC Control Module with the engine started.

   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. Refer to VEHICLE DYNAMICS CONTROL (VDC)>VDC OFF SWITCH .

   Is the check result OK?

   Yes:  Go to  4.

   No:  Replace the VDC OFF switch.

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

      Connector & terminal 

      Models without EyeSight 

      (B310) No. 20 - Chassis ground:

      Models with EyeSight 

      (B310) No. 31 - Chassis ground:

   Is the resistance less than 10 Ω?

   Yes:  Check the VDC OFF switch circuit.

   No:  Go to  5.

5. CHECK LAN SYSTEM. 

   Perform the diagnosis for LAN system. Refer to LAN SYSTEM (DIAGNOSTICS)>BASIC DIAGNOSTIC PROCEDURE .

   Is there any fault in LAN system?

   Yes:  Perform the diagnosis according to DTC for LAN system. Refer to LAN SYSTEM (DIAGNOSTICS)>LIST OF DIAGNOSTIC TROUBLE CODE (DTC) .

   No:  Go to  6.

6. CHECK COMBINATION METER. 

   Check the combination meter. Refer to INSTRUMENTATION/DRIVER INFO>COMBINATION METER SYSTEM>OPERATION>SELF-DIAGNOSIS DISPLAY MODE .

   Is the check result OK?

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

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