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  .
   1. Select the [Data Monitor] using Subaru Select Monitor. Ref. to BRAKE CONTROL (DIAGNOSTICS)>DATA MONITOR .
   2. Read [Ambient Temp Sensor] indicated on the display screen.

   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 VDCCM&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 VDCCM&H/U. Ref. to BRAKE CONTROL (DIAGNOSTICS)>Diagnostic Trouble Code (DTC)>LIST .

   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 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.