Subaru Legacy BN/BS (2015-2019) Service Manual: Dtc c1413 power supply voltage

Subaru Legacy BN/BS (2015-2019) Service Manual / Vehicle dynamics control (vdc) (diagnostics) / Diagnostic procedure with diagnostic trouble code (dtc) / Dtc c1413 power supply voltage

DTC DETECTING CONDITION:

A fault is detected if the power supply voltage is out of normal range for a predetermined time or more.

TROUBLE SYMPTOM:

• ABS does not operate.

• EBD may not operate.

• VDC does not operate.

• Hill hold does not function.

• EyeSight does not operate. (Models with EyeSight)

NOTE:

Warning lights go off if voltage returns.

WIRING DIAGRAM:

Vehicle dynamics control system Vehicle Dynamics Control System

STEP	CHECK	YES	NO
1.CHECK GENERATOR. 1) Start the engine. 2) Run the engine at idle after warming up. 3) Measure the voltage between generator terminal B and chassis ground. Terminals Generator terminal B (+) — Chassis ground (−):	Is the voltage 10 — 15 V-	Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC C1413 POWER SUPPLY VOLTAGE	Repair the generator.
2.CHECK BATTERY TERMINAL. Turn the ignition switch to OFF.	Are the positive and negative battery terminals installed tightly-	Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC C1413 POWER SUPPLY VOLTAGE	Install the battery terminal correctly.
3.CHECK VDCCM&H/U INPUT VOLTAGE. 1) Disconnect the connector from the VDCCM&H/U. 2) Run the engine at idle. 3) Operate devices such as headlights, air conditioner, rear defogger, etc. which produce an electrical load. 4) Measure the voltage between VDCCM&H/U connector and chassis ground. Connector & terminal (B310) No. 5 (+) — Chassis ground (−): (B310) No. 16 (+) — Chassis ground (−): (B310) No. 33 (+) — Chassis ground (−):	Is the voltage 10 — 15 V-	Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC C1413 POWER SUPPLY VOLTAGE	Repair the power supply circuit.
4.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 C1413 POWER SUPPLY VOLTAGE	Repair the VDCCM&H/U ground harness circuit.
5.CHECK POOR CONTACT OF CONNECTORS.	Is there poor contact of connector between generator, battery and VDCCM&H/U-	Repair the connector.	Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC C1413 POWER SUPPLY VOLTAGE
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 C1413 POWER SUPPLY VOLTAGE
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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