Subaru Legacy BN/BS (2015-2019) Service Manual: Dtc c1951 actuator

Subaru Legacy BN/BS (2015-2019) Service Manual / Vehicle dynamics control (vdc) (diagnostics) / Diagnostic procedure with diagnostic trouble code (dtc) / 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:

NOTE:

For the coupling connector, refer to “WIRING SYSTEM”.

Parking brake / brake fluid level warning light system Parking Brake / Brake Fluid Level Warning Light System

STEP	CHECK	YES	NO
1.CHECK BATTERY. 1) Turn the ignition switch to ON. 2) Check the battery voltage. Battery > INSPECTION Battery > INSPECTION	Is the voltage 10 — 15 V-	Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC C1951 ACTUATOR	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 & terminal (B310) No. 46 — Chassis ground:	Is the resistance less than 10 --	Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC C1951 ACTUATOR	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 & terminal (B310) No. 34 — (R153) No. 2: (B310) No. 35 — (R153) No. 1: (B310) No. 44 — (R154) No. 1: (B310) No. 45 — (R154) No. 2:	Is the resistance less than 1 --	Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC C1951 ACTUATOR	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-	Repair the connector.	Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC C1951 ACTUATOR
5.CHECK DRIVER’S DOOR SWITCH. Check the driver’s door switch. Keyless Entry System > INSPECTION	Is the driver’s door switch normal-	Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC C1951 ACTUATOR	Repair the driver’s door switch or circuit.
6.CHECK VDCCM&H/U. 1) Connect all connectors. 2) Perform the Clear Memory Mode. Clear Memory Mode 3) Set the hill hold function to ON. 4) Read the DTC. Read Diagnostic Trouble Code (DTC)	Is the same DTC displayed-	Replace the VDCCM&H/U. VDC Control Module and Hydraulic Control Unit (VDCCM&H/U)	Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC C1951 ACTUATOR
7.CHECK DETECTION OF OTHER DTCS FOR VDC. Read Diagnostic Trouble Code (DTC)	Is any other DTC displayed-	Perform the diagnosis according to DTC. List of Diagnostic Trouble Code (DTC)	Currently, it is normal. There may have been a poor contact in the harness and connector or a temporarily noise interference. NOTE: This DTC may be stored, if the driver’s door is opened while the electronic parking brake is operating. Therefore, check the freeze frame data.

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