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: 

Parking brake system does not operate.

Wiring diagram: 

Parking brake/brake fluid level warning light system Ref. to WIRING SYSTEM>PARKING BRAKE/BRAKE FLUID LEVEL WARNING LIGHT SYSTEM .

Courtesy of SUBARU OF AMERICA, INC.

1. CHECK BATTERY. 
   1. Turn the ignition switch to OFF.
   2. Check the battery voltage. Ref. to STARTING/CHARGING SYSTEMS (H4DOTC)>BATTERY>INSPECTION .

   Is the voltage 10 - 15 V?

   Yes  : Go to  2.

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

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

      Connector and terminal 

      (B310) No. 14 - Chassis ground:

   Is the resistance less than 10 Ω?

   Yes  : Go to  3.

   No  : Repair the VDCCM & 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 VDCCM & H/U and rear brake caliper connector.

      Connector and 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 VDCCM & H/U and rear brake caliper connector.

4. CHECK POOR CONTACT OF CONNECTORS. 

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

   Yes  : Repair the connector.

   No  : Go to  5.

5. CHECK DRIVER'S DOOR SWITCH. 

   Check the driver's door switch. Ref. to SECURITY AND LOCKS>DOOR LOCK CONTROL 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 VDCCM & H/U. 
   1. Connect all connectors.
   2. Using the Subaru Select Monitor, perform the clear memory. Ref. to COMMON (diag)>CLEAR MEMORY .
   3. Set the AVH function to ON.
   4. 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 VEHICLE DYNAMICS CONTROL (VDC)>VDC CONTROL MODULE AND HYDRAULIC CONTROL UNIT (VDCCM & H/U) .

   No  : Go to  7.

7. 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.