Basic Diagnostic Procedure: Procedure

CAUTION: Remove foreign matter (dust, water, oil etc.) from the VSC (VDC) Control Module & H/U connector during removal and installation.

CHECK PRE-INSPECTION .
1. Ask the customer when and how the trouble occurred using the Check List for Interview, Ref. to BRAKE CONTROL (DIAGNOSTICS)>CHECK LIST FOR INTERVIEW .
2. Before performing diagnostics, check the component which might affect VSC (VDC) or parking brake system problems. Ref. to BRAKE CONTROL (DIAGNOSTICS)>GENERAL DESCRIPTION>INSPECTION .
Is the check result OK?

Yes: Go to 2.

No: Repair or replace each component.
CHECK INDICATION OF DTC .
1. Turn the ignition switch to ON.
2. Read the DTC of [Brake Control] using the Subaru Select Monitor. Ref. to BRAKE CONTROL (DIAGNOSTICS)>DIAGNOSTIC TROUBLE CODE (DTC) .
  NOTE: If the communication function of the Subaru Select Monitor cannot be executed properly, check the communication circuit. Ref. to BRAKE CONTROL (DIAGNOSTICS)>DIAGNOSTIC PROCEDURE FOR SUBARU SELECT MONITOR COMMUNICATION .
  
  Are any DTCs displayed?
  
  Yes: Record the DTC, time stamp and freeze frame data. Go to 4.
  
  No: Go to 3.
PERFORM GENERAL DIAGNOSTICS .
1. Perform the inspection by referring to "General Diagnostic Table". Ref. to BRAKE CONTROL (DIAGNOSTICS)>GENERAL DIAGNOSTIC TABLE>INSPECTION .
2. Using the Subaru Select Monitor, perform the clear memory of [Brake Control]. Ref. to COMMON (DIAGNOSTICS)>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) .
5. Check that the DTC is not displayed.
  Do the VSC (VDC) warning light & VSC (VDC) indicator light, VSC (VDC) OFF indicator light and ABS warning light go off after starting the engine?
  
  Yes: Finish the diagnosis.
  
  No: Check the combination meter circuit. Ref. to BRAKE CONTROL (DIAGNOSTICS)>WARNING LIGHT ILLUMINATION PATTERN>ABS WARNING LIGHT DOES NOT GO OFF . Ref. to BRAKE CONTROL (DIAGNOSTICS)>WARNING LIGHT ILLUMINATION PATTERN>VSC (VDC) WARNING LIGHT AND VSC (VDC) INDICATOR LIGHT DOES NOT GO OFF . Ref. to BRAKE CONTROL (DIAGNOSTICS)>WARNING LIGHT ILLUMINATION PATTERN>VSC (VDC) OFF INDICATOR LIGHT DOES NOT GO OFF .
PERFORM DIAGNOSIS .
1. Refer to "Diagnostic Trouble Code (DTC)".
  NOTE: For the DTC list, refer to "Diagnostic Trouble Code (DTC)". Ref. to BRAKE CONTROL (DIAGNOSTICS)>DIAGNOSTIC TROUBLE CODE (DTC)>LIST .
2. Repair or replace the cause of trouble.
3. Using the Subaru Select Monitor, perform the clear memory of [Brake Control]. Ref. to COMMON (DIAGNOSTICS)>CLEAR MEMORY .
4. Execute the inspection mode. Ref. to BRAKE CONTROL (DIAGNOSTICS)>INSPECTION MODE .
5. Read the DTC of [Brake Control] using the Subaru Select Monitor. Ref. to BRAKE CONTROL (DIAGNOSTICS)>DIAGNOSTIC TROUBLE CODE (DTC) .
  Are any DTCs displayed?
  
  Yes: Repeat step 4 until DTC is not shown.
  
  No: Finish the diagnosis.
  NOTE:
  - To check harness for open or short circuits, shake the suspected trouble spot or connector.
  - Refer to "Check List for Interview". Ref. to BRAKE CONTROL (DIAGNOSTICS)>CHECK LIST FOR INTERVIEW .