DTC C1951: Actuator

DTC detecting condition: 

A fault is detected if the electronic parking brake operation status does not match the operation request.

Trouble symptom: 

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

Wiring diagram: 

Parking brake/brake fluid level warning light system. Refer to WIRING SYSTEM>PARKING BRAKE/BRAKE FLUID LEVEL WARNING LIGHT SYSTEM>WIRING DIAGRAM>WITH EYESIGHT .

Courtesy of SUBARU OF AMERICA, INC.

1. CHECK BATTERY. 
   1. Turn the ignition switch to OFF.
   2. Check the battery voltage. Refer to STARTING/CHARGING SYSTEMS (W/O STI)>BATTERY>INSPECTION . Refer to STARTING/CHARGING SYSTEMS (STI)>BATTERY>INSPECTION .

   Is the voltage 10 - 15 V?

   Yes:  Go to  2.

   No:  Charge or replace the battery. Check the generator circuit.

2. CHECK VDC Control Module & H/U GROUND CIRCUIT (CHECK FOR OPEN CIRCUIT). 
   1. Turn the ignition switch to OFF.
   2. Disconnect the connector from the VDC Control Module & H/U.
   3. Measure the resistance between VDC Control Module & H/U connector and chassis ground.

      Connector & terminal 

      (B310) No. 14 - Chassis ground:

   Is the resistance less than 10 Ω?

   Yes:  Go to  3.

   No:  Repair the VDC Control Module & H/U ground circuit.

3. CHECK HARNESS (CHECK FOR OPEN CIRCUIT). 
   1. Turn the ignition switch to OFF.
   2. Disconnect the connectors from rear brake caliper.
   3. Measure the resistance between VDC Control Module & H/U and rear brake caliper connector.

      Connector & terminal 

      (B310) No. 2 - (R153) No. 2:

      (B310) No. 3 - (R153) No. 1:

      (B310) No. 12 - (R154) No. 1:

      (B310) No. 13 - (R154) No. 2:

   Is the resistance less than 1 Ω?

   Yes:  Go to  4.

   No:  Repair harness and connector between VDC Control Module & H/U and rear brake caliper connector.

4. CHECK POOR CONTACT OF CONNECTORS. 

   Is there poor contact of power supply circuit, ground circuit and VDC Control Module & H/U connector?

   Yes:  Repair the connector.

   No:  Go to  5.

5. CHECK DRIVER'S DOOR SWITCH. 

   Check the driver's door switch. Refer to SECURITY AND LOCKS>SECURITY SYSTEM>INSPECTION>CHECK DOOR SWITCH .

   Is the check result OK?

   Yes:  Go to  6.

   No:  Repair the driver's door switch or circuit.

6. CHECK VDC Control Module & H/U. 
   1. Connect all connectors.
   2. Perform the Clear Memory Mode. Refer to VEHICLE DYNAMICS CONTROL (VDC) (DIAGNOSTICS)>CLEAR MEMORY MODE .
   3. Set the AVH function to ON.
   4. 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 (VDC Control Module & H/U) .

   No:  Go to  7.

7. 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.