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HOMESERVICE MANUALSSUBARU2016LEGACY 2.5IREPAIR AND DIAGNOSISBRAKESTRACTION CONTROLVEHICLE DYNAMICS CONTROL (VDC) SYSTEM (DIAGNOSTICS)DIAGNOSTIC PROCEDURE WITH DIAGNOSTIC TROUBLE CODE (DTC)DTC C1935 IGNITION SWITCH CIRCUITWIRING DIAGRAM
2016 Subaru Legacy 2.5i

DTC C1935 Ignition Switch Circuit: Wiring Diagram

2016 Subaru Legacy 2.5iSECTION Wiring Diagram

Parking brake/brake fluid level warning light system < Ref. to appropriate wiring diagram in SYSTEM WIRING DIAGRAM article. >

Fig 1: Ignition Switch - Wiring Diagram
G10272421Courtesy of SUBARU OF AMERICA, INC.
DIAGNOSTIC PROCEDURE

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? Go to step 2  . 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 Ω? Go to step 3  . 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. < Ref. to READ CURRENT DATA . >
  2. Read the «Voltage of IGN» displayed on the screen.
 Is the voltage 10 - 15 V? Go to step 4  . Perform the diagnosis for the body control system. < Ref. to BASIC DIAGNOSTIC PROCEDURE . >
4 CHECK LAN SYSTEM. 
Check the DTC in LAN system. < Ref. to OPERATION , Read Diagnostic Trouble Code (DTC). >		 Is DTC of LAN system displayed? Perform the diagnosis according to DTC. < Ref. to LIST OF DIAGNOSTIC TROUBLE CODE (DTC) . > Go to step 5  .
5 CHECK POOR CONTACT OF CONNECTORS.  Is there poor contact of power supply circuit, ground circuit and VDCCM & H/U connector? Repair the connector. Go to step 6  .
6 CHECK VDCCM & H/U. 
  1. Connect all connectors.
  2. Perform the Clear Memory Mode. < Ref. to CLEAR MEMORY MODE . >
  3. Perform the Inspection Mode. < Ref. to INSPECTION MODE . >
  4. Read the DTC. < Ref. to READ DIAGNOSTIC TROUBLE CODE (DTC) . >
 Is the same DTC displayed? Replace the VDCCM & H/U. < Ref. to VDC CONTROL MODULE AND HYDRAULIC CONTROL UNIT (VDCCM & H/U) . > Go to step 7  .
7 CHECK DETECTION OF OTHER DTCS FOR VDC. 
< Ref. to READ DIAGNOSTIC TROUBLE CODE (DTC) . >		 Is any other DTC displayed? Perform the diagnosis according to DTC. < Ref. to 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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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

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