DTC B2352: Radar ASSY B&S Reprogramming Error

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 SYSTEM>Blind Spot Detection/Rear Cross Traffic Alert>WIRING DIAGRAM

Courtesy of SUBARU OF AMERICA, INC.

1. CHECK DTC  .

   Read the DTC. Ref. to Blind Spot Detection/Rear Cross Traffic Alert (DIAGNOSTICS)>Read Diagnostic Trouble Code (DTC)>OPERATION 

   Is DTC B2352 displayed? (Current malfunction)

   Yes: Go to  2

   No: 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)  .
   1. Disconnect the radar sensor connectors LH and RH.
   2. 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?

   Yes: Go to  3

   No: 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?

   Yes: Go to  4

   No: 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?

   Yes: Go to  5

   No: 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?

   Yes: Go to  6

   No: Replace the radar sensor RH or radar sensor LH. Ref. to Blind Spot Detection/Rear Cross Traffic Alert>Radar Sensor

6. CHECK BSD/RCTA  .
   1. Restore the vehicle to its original state.
   2. Perform the Clear Memory Mode. Ref. to Blind Spot Detection/Rear Cross Traffic Alert (DIAGNOSTICS)>Read Diagnostic Trouble Code (DTC)>OPERATION 
   3. Perform the Inspection Mode. Ref. to Blind Spot Detection/Rear Cross Traffic Alert (DIAGNOSTICS)>Inspection Mode 

   Is DTC B2352 displayed? (Current malfunction)

   Yes: Replace the radar sensor on the side that displayed the DTC. Ref. to Blind Spot Detection/Rear Cross Traffic Alert>Radar Sensor

   No: 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.