Subaru Legacy BN/BS (2015-2019) Service Manual: Dtc b2814 power supply low voltage

Subaru Legacy BN/BS (2015-2019) Service Manual / Eyesight (diagnostics) / Diagnostic procedure with diagnostic trouble code (dtc) / Dtc b2814 power supply low voltage

Detected when the status of 7.0 V or less continues approximately for 5 seconds and is judged to be low-voltage malfunction, or when the +B harness of the stereo camera is broken.

DTC DETECTING CONDITION:

• Input voltage to stereo camera is out of specifications.

• Defective stereo camera control harness (open circuit in +B harness)

• Defective stereo camera

TROUBLE SYMPTOM:

• All functions of EyeSight system do not operate.

• EyeSight warning light blinks or illuminates.

• Cruise indicator light blinks.

• Malfunction indicator light illuminates.

• VDC warning light illuminates.

• ATF temperature warning light illuminates.

WIRING DIAGRAM:

NOTE:

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

EyeSight System EyeSight System > WIRING DIAGRAM

STEP	CHECK	YES	NO
1.CHECK GENERATOR. 1) Start the engine and idle for a while. 2) Measure the voltage between generator terminal B and chassis ground. Connector & terminal Generator terminal B (+) — Chassis ground (−):	Is the voltage 10 V or more-	Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC B2814 POWER SUPPLY LOW VOLTAGE	Check the generator. Generator Generator
2.CHECK BATTERY TERMINAL. Turn the ignition switch to OFF.	Is the battery terminal connected securely-	Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC B2814 POWER SUPPLY LOW VOLTAGE	Tighten the battery terminal securely.
3.CHECK FUSE. Check fuses No. 19 and No. 38 in the fuse & relay box. Relay and Fuse	Is the fuse OK-	Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC B2814 POWER SUPPLY LOW VOLTAGE	Replace the faulty fuse. When the replaced fuse blows out easily, check the short circuit in harness.
4.CHECK HARNESS (POWER SUPPLY CIRCUIT). 1) Disconnect the stereo camera. 2) Turn the ignition switch to ON. 3) Measure the voltage between harness connector of stereo camera and chassis ground. Connector & terminal (R137) No. 6 (+) — Chassis ground (−): (R137) No. 8 (+) — Chassis ground (−):	Is the voltage 10 V or more-	Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC B2814 POWER SUPPLY LOW VOLTAGE	Check the power supply system circuit, and if any fault is found, repair the defective parts or replace the harness.
5.CHECK HARNESS (GROUND CIRCUIT). 1) Turn the ignition switch to OFF. 2) Disconnect the ground cable from battery. 3) Measure the resistance between stereo camera and chassis ground. Connector & terminal (R137) No. 7 — Chassis ground:	Is the resistance less than 10 --	Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC B2814 POWER SUPPLY LOW VOLTAGE	Check the ground system circuit, and if any fault is found, repair the defective parts or replace the harness.
6.CHECK POOR CONTACT OF CONNECTORS. Check stereo camera connector.	Is there poor contact of the connector-	Repair the connector.	Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC B2814 POWER SUPPLY LOW VOLTAGE
7.CHECK STEREO CAMERA. 1) Connect all connectors and battery terminals securely. 2) Start the engine, drive the vehicle at 40 km/h (24.9 MPH) or more, stop the vehicle and then stop the engine. 3) After 3 seconds or more have elapsed, restart the engine. 4) Clear the memory. Clear Memory Mode 5) Read the DTC. Diagnostic Code(s) Display	Is the same DTC (DTC B2814 or B2815) displayed-	Replace the stereo camera. Stereo Camera > REMOVAL	Even if DTC is displayed, the circuit has returned to a normal condition at this time. Reproduce the failure, and then perform the diagnosis again. NOTE: In this case, temporary poor contact of connector, or temporary open or short circuit of harness may be the cause.

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