Subaru Legacy BN/BS (2015-2019) Service Manual: Dtc c1935 ignition switch circuit

Subaru Legacy BN/BS (2015-2019) Service Manual / Vehicle dynamics control (vdc) (diagnostics) / Diagnostic procedure with diagnostic trouble code (dtc) / Dtc c1935 ignition switch circuit

DTC DETECTING CONDITION:

A fault is detected after a predetermined period of time, if the hardware IGN signal and CAN IGN signal were compared and did not match.

TROUBLE SYMPTOM:

Brake warning light illuminates.

WIRING DIAGRAM:

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

STEP	CHECK	YES	NO
1.CHECK VDCCM&H/U INPUT VOLTAGE. 1) Turn the ignition switch to OFF. 2) Disconnect the connector from the VDCCM&H/U. 3) Turn the ignition switch to ON. 4) Measure the voltage between VDCCM&H/U connector and chassis ground. Connector & terminal (B310) No. 5 (+) — Chassis ground (−):	Is the voltage 10 — 15 V-	Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC C1935 IGNITION SWITCH CIRCUIT	Repair the power supply circuit including the fuse.
2.CHECK VDCCM&H/U GROUND CIRCUIT (CHECK FOR OPEN CIRCUIT). 1) Turn the ignition switch to OFF. 2) 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 C1935 IGNITION SWITCH CIRCUIT	Repair the VDCCM&H/U ground circuit.
3.CHECK INPUT VOLTAGE OF BODY INTEGRATED UNIT. 1) Using the Subaru Select Monitor, select “Data monitor” in body control system. Read Current Data 2) Read the «Voltage of IGN» displayed on the screen.	Is the voltage 10 — 15 V-	Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC C1935 IGNITION SWITCH CIRCUIT	Perform the diagnosis for the body control system. Basic Diagnostic Procedure
4.CHECK LAN SYSTEM. Check the DTC in LAN system. Read Diagnostic Trouble Code (DTC) > OPERATION	Is DTC of LAN system displayed-	Perform the diagnosis according to DTC. List of Diagnostic Trouble Code (DTC)	Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC C1935 IGNITION SWITCH CIRCUIT
5.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 C1935 IGNITION SWITCH CIRCUIT
6.CHECK VDCCM&H/U. 1) Connect all connectors. 2) Perform the Clear Memory Mode. Clear Memory Mode 3) Perform the Inspection Mode. Inspection Mode 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 C1935 IGNITION SWITCH CIRCUIT
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.

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