Subaru Legacy BN/BS (2015-2019) Service Manual: Dtc b2300 rear radar circuit low

Subaru Legacy BN/BS (2015-2019) Service Manual / Blind spot detection rear cross traffic alert (diagnostics) / Diagnostic procedure with diagnostic trouble code (dtc) / Dtc b2300 rear radar circuit low

DTC DETECTING CONDITION:

• Short circuit to ground in the harness between radar sensor and outer mirror assembly

• Ground short circuit of the harness in outer mirror assembly module (Malfunction of the outer mirror assembly)

• Defective radar sensor

TROUBLE SYMPTOM:

• All functions of BSD/RCTA stop.

• Fail icon is displayed in the combination meter LCD display.

• Failure-related notification is displayed for approx. two seconds on LCD display in the combination meter.

WIRING DIAGRAM:

NOTE:

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

BSD/RCTA system Blind Spot Detection/Rear Cross Traffic Alert > WIRING DIAGRAM

• Radar sensor LH

• Radar sensor RH

NOTE:

Check and replace the side that displayed the DTC.

STEP	CHECK	YES	NO
1.CHECK DTC. Read the DTC. Read Diagnostic Trouble Code (DTC) > OPERATION	Is DTC B2327 displayed- (Current malfunction)	Perform the diagnosis according to DTC. Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC B2327 REAR RADAR INTERNAL FAILURE (INTERNAL ELECTRIC CIRCUIT)	Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC B2300 REAR RADAR CIRCUIT LOW
2.CHECK DTC. Read the DTC. Read Diagnostic Trouble Code (DTC) > OPERATION	Is DTC B2300 displayed- (Current malfunction)	Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC B2300 REAR RADAR CIRCUIT LOW	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, temporary open or short circuit of harness may be the cause.
3.CHECK OPERATION CHECK MODE. Perform the system operation check mode «Door mirror indicator active test» from «Subaru Rear Vehicle Detection(RH)» or «Subaru Rear Vehicle Detection(LH)». System Operation Check Mode	Does the indicator illuminate-	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, temporary open or short circuit of harness may be the cause.	Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC B2300 REAR RADAR CIRCUIT LOW
4.CHECK HARNESS (GROUND SHORT CIRCUIT). 1) Disconnect the radar sensor connector. 2) Disconnect the outer mirror assembly connector. 3) Using a tester, measure the resistance between radar sensor connector (harness side) and the chassis ground. Connector & terminal Radar sensor LH (R25) No. 4 — Chassis ground: Radar sensor RH (R61) No. 4 — Chassis ground:	Is the resistance 1 M- or more-	Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC B2300 REAR RADAR CIRCUIT LOW	Repair the short to ground in harness between radar sensor connector and outer mirror assembly connector.
5.CHECK CONNECTOR. Check the radar sensor connector and the outer mirror assembly connector.	Is there any fault- (Insecure connection, poor contact, etc.)	Repair the connector.	Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC B2300 REAR RADAR CIRCUIT LOW
6.CHECK OUTER MIRROR ASSEMBLY. Perform unit-check for the outer mirror assembly. Outer Mirror Assembly	Is there any fault-	Replace the outer mirror assembly. Outer Mirror Assembly	Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC B2300 REAR RADAR CIRCUIT LOW
7.CHECK BSD/RCTA. 1) Restore the vehicle to its original state. 2) Perform the Inspection Mode. Inspection Mode	Is DTC B2300 displayed- (Current malfunction)	Replace the radar sensor. Radar Sensor	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, temporary open or short circuit of harness may be the cause.

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