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 (H4DO)>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. 46 - 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. Ref. to SECURITY AND LOCKS>DOOR LOCK CONTROL SYSTEM>INSPECTION>CHECK DOOR SWITCH .

   Is the driver's door switch normal?

   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. 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 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  7.

7. CHECK DETECTION OF OTHER DTCS FOR VDC. 

   Yes:  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.