DTC B2350 Rear Radar Communication Error Between Master And Slave

DTC DETECTING CONDITION:

Defective harness for CAN communication between radar sensor LH and radar sensor RH
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:

SRVD system <Ref. to WIRING DIAGRAM , Blind Spot Detection/Rear Cross Traffic Alert.>

Fig 1: Rear Radar Communication Error Between Master And Slave Wiring Diagram

Courtesy of SUBARU OF AMERICA, INC.

Step	Check	Yes	No
1 CHECK DTC. Read the DTC. <Ref. to OPERATION , Read Diagnostic Trouble Code (DTC).>	Is DTC B2350 displayed? (Current malfunction)	Go to step 2 .	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.
2 CHECK HARNESS (OPEN CIRCUIT). Disconnect the radar sensor connectors LH and RH. Using a tester, measure the resistance between radar sensor RH connector (harness side) and radar sensor LH connector (harness side). Connector & terminal (R25) No. 1 - (R61) No. 1: (R25) No. 6 - (R61) No. 6:	Is the resistance less than 1 Ω?	Go to step 3 .	Repair the open circuit of harness between radar sensor RH connector and radar sensor LH connector.
3 CHECK HARNESS (SHORT BETWEEN LINES, GROUND SHORT CIRCUIT). Using a tester, measure the resistance between radar sensor LH connectors (harness side) and the resistance between radar sensor LH connector (harness side) and chassis ground. Connector & terminal (R25) No. 1 - (R25) No. 6: (R25) No. 1 - Chassis ground: (R25) No. 6 - Chassis ground:	Is the resistance 1 MΩ or more?	Go to step 4 .	Repair the short circuit of harness between radar sensor RH connector and radar sensor LH connector.
4 CHECK HARNESS (SHORT CIRCUIT TO POWER SUPPLY). Using a tester, measure the voltage between radar sensor LH connector (harness side) and chassis ground. Connector & terminal (R25) No. 1 (+) - Chassis ground (-): (R25) No. 6 (+) - Chassis ground (-):	Is the voltage less than 1 V?	Go to step 5 .	Repair the short to power supply in harness between radar sensor RH connector and radar sensor LH connector.
5 CHECK RADAR SENSOR. (INTERNAL IMPEDANCE). Using a tester, measure the resistance between radar sensor LH connectors (module side) and the resistance between radar sensor RH connectors (module side). Connector & terminal (R25) No. 1 - (R25) No. 6: (R61) No. 1 - (R61) No. 6:	Is the resistance approximately 120 Ω?	Go to step 6 .	Replace the radar sensor RH or radar sensor LH. <Ref. to Radar Sensor .>
6 CHECK BSD/RCTA. Restore the vehicle to its original state. Perform the Clear Memory Mode. <Ref. to OPERATION , Read Diagnostic Trouble Code (DTC).> Perform the Inspection Mode. <Ref. to INSPECTION MODE .>	Is DTC B2350 displayed? (Current malfunction)	Replace the radar sensor on the side that displayed the DTC. <Ref. to 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.