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: 

• AVH does not function. (Models with EyeSight)
• Parking brake system does not operate sometimes.

1. CHECK OUTPUT OF AMBIENT SENSOR USING SUBARU SELECT MONITOR. 
   1. Using the Subaru Select Monitor, select "Data monitor". Refer to VEHICLE DYNAMICS CONTROL (VDC) (DIAGNOSTICS)>SUBARU SELECT MONITOR>OPERATION>READ CURRENT DATA .
   2. Read the «Ambient Temp Sensor» displayed on the 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 VDC CONTROL MODULE & H/U. 
   1. Turn the ignition switch to OFF.
   2. Stop the vehicle for approximately one hour.
   3. Perform the Clear Memory Mode. Refer to VEHICLE DYNAMICS CONTROL (VDC) (DIAGNOSTICS)>CLEAR MEMORY MODE .
   4. Perform the Inspection Mode. Refer to VEHICLE DYNAMICS CONTROL (VDC) (DIAGNOSTICS)>INSPECTION MODE .
   5. Read the DTC. Refer to VEHICLE DYNAMICS CONTROL (VDC) (DIAGNOSTICS)>READ DIAGNOSTIC TROUBLE CODE (DTC) .

   Is the same DTC displayed?

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

   No:  Go to  3.

3. CHECK DETECTION OF OTHER DTCS FOR VDC. 

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

   Is any other DTC displayed?

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

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