Model Without Eyesight (IMPREZA Model) • Mt Model (CROSSTREK Model)

DTC detecting condition: 

• A fault is detected if a change of the vehicle speed from high to low occurs for a predetermined number of times or more, while a change of the stop light switch from OFF to ON is not detected.
• A fault is detected if stop light switch ON status continues for long time while the vehicle speed is at the predetermined speed or higher.

Trouble symptom: 

• VDC does not operate.
• Hill start assist does not operate.

Wiring diagram: 

Vehicle dynamics control system Ref. to WIRING SYSTEM (IMPREZA MODEL)>VEHICLE DYNAMICS CONTROL SYSTEM . Ref. to WIRING SYSTEM (CROSSTREK MODEL (EXCEPT FOR HEV))>VEHICLE DYNAMICS CONTROL SYSTEM .

Courtesy of SUBARU OF AMERICA, INC.

1. INTERVIEW CUSTOMERS  .

   Make sure that the operation was performed in which accelerator pedal and brake pedal were depressed simultaneously (with depressing brake pedal with left foot).

   Were the acceleration pedal and brake pedal depressed simultaneously?

   Yes:  System is normal. (DTC may be recorded if the brake pedal is always depressed while driving.)

   No:  Go to  2.

2. CHECK STOP LIGHT SWITCH  .
   1. Turn the ignition switch to OFF.
   2. Disconnect the stop light switch connector.
   3. Measure the resistance of stop light switch terminals.

      Terminals 

      No. 1 - No. 2:

   Is the resistance 1 MΩ or more when stop light switch is OFF (when pedal is not depressed)?

   Yes:  Go to  3.

   No:  Replace the stop light switch. Ref. to BRAKE>STOP LIGHT SWITCH .

3. CHECK STOP LIGHT SWITCH HARNESS  .
   1. Disconnect the connector from the VDCCM and H/U.
   2. Measure the resistance between VDCCM and H/U connector and chassis ground.

      Connector and terminal 

      (B310) No. 2 - Chassis ground:

   Is the resistance less than 1 MΩ?

   Yes:  Go to  4.

   No:  Repair the stop light switch circuit.

4. CHECK VDCCM AND H/U  .
   1. Connect all connectors.
   2. Using the Subaru Select Monitor, perform the clear memory of [Brake Control]. Ref. to COMMON (DIAG)>CLEAR MEMORY .
   3. Execute the inspection mode. Ref. to BRAKE CONTROL (DIAGNOSTICS)>INSPECTION MODE .
   4. Read the DTC of [Brake Control] using the Subaru Select Monitor. Ref. to BRAKE CONTROL (DIAGNOSTICS)>DIAGNOSTIC TROUBLE CODE (DTC) .

   Is the same DTC displayed?

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

   No:  Go to  5.

5. CHECK DETECTION OF OTHER DTCS FOR VDC  .

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

   Is any other DTC displayed?

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

   No:  Currently, it is normal. There may have been a temporary poor contact in the harness and connector or a temporary noise interference.