DTC C1983: High Frequency Operation

DTC Detecting condition: 

This malfunction is stored if the electronic parking brake is operated with high frequency in a short period of time.

Trouble symptom: 

Parking brake system does not operate sometimes.

1. CHECK OUTPUT OF AMBIENT SENSOR USING SUBARU SELECT MONITOR. 

   Using Subaru Select Monitor, display [Ambient Temp Sensor] of [Data Monitor]. Ref. to BRAKE CONTROL (DIAGNOSTICS)>DATA MONITOR .

   Is the reading of [Ambient Temp Sensor] within the range of ±10°C to the ambient temperature?

   Yes:  Go to  2.

   No:  Repair the ambient sensor circuit.

2. CHECK VDC Control Module & H/U. 
   1. Turn the ignition switch to OFF.
   2. Stop the vehicle for approximately one hour.
   3. Using the Subaru Select Monitor, perform the clear memory. Ref. to COMMON (DIAG)>CLEAR MEMORY .
   4. Execute the inspection mode. Ref. to BRAKE CONTROL (DIAGNOSTICS)>INSPECTION MODE .
   5. Read the DTC using Subaru Select Monitor. Ref. to BRAKE CONTROL (DIAGNOSTICS)>DIAGNOSTIC TROUBLE CODE (DTC) .

      Is the same DTC displayed?

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

      No:  Go to  3.

3. CHECK DETECTION OF OTHER DTCS FOR VDC. 

   Read the DTC using 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.