DTC B2350: Rear Radar Communication Error Between Master And Slave
DTC Detecting condition:
- Defective harness for CAN communication between radar sensor LH - 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:
BSD/RCTA system Refer to WIRING SYSTEM>Blind Spot Detection/Rear Cross Traffic Alert>WIRING DIAGRAM .
- CHECK DTC
.
Using the Subaru Select Monitor, read the DTCs of [Blind Spot Detection/Rear Cross Traffic Alert(RH)] or [Blind Spot Detection/Rear Cross Traffic Alert(LH)]. Refer to BLIND SPOT DETECTION/REAR CROSS TRAFFIC ALERT (DIAGNOSTICS)>DIAGNOSTIC TROUBLE CODE (DTC) .
- Blind Spot Detection/Rear Cross Traffic Alert(RH)
- Blind Spot Detection/Rear Cross Traffic Alert(LH)
Is DTC B2350 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. - 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
(L107) No. 1 - (R104) No. 1:
(L107) No. 6 - (R104) 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.
- 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
(L107) No. 1 - (L107) No. 6:
(L107) No. 1 - Chassis ground:
(L107) 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.
- CHECK HARNESS (SHORT CIRCUIT TO POWER SUPPLY)
.
- Turn the ignition switch to ON.
- Using a tester, measure the voltage between radar sensor LH connector (harness side) and chassis ground.
Connector & terminal
(L107) No. 1 (+) - Chassis ground (-):
(L107) 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.
- CHECK RADAR SENSOR. (INTERNAL IMPEDANCE)
.
Using a tester, measure the internal impedance between radar sensor LH and radar sensor RH terminals.
Terminals
Radar sensor LH
No. 1 - No. 6:
Radar sensor RH
No. 1 - No. 6:
Is the resistance approximately 120 Ω?
Yes : Go to 6.
No : Replace the radar sensor RH or radar sensor LH. Refer to BLIND SPOT DETECTION/REAR CROSS TRAFFIC ALERT>RADAR SENSOR .
- CHECK BSD/RCTA
.
- Restore the vehicle to its original state.
- Using the Subaru Select Monitor, perform the clear memory of [Blind Spot Detection/Rear Cross Traffic Alert(RH)] or [Blind Spot Detection/Rear Cross Traffic Alert(LH)].
Refer to COMMON (DIAG)>CLEAR MEMORY
.
- Blind Spot Detection/Rear Cross Traffic Alert(RH)
- Blind Spot Detection/Rear Cross Traffic Alert(LH)
- Perform the inspection mode.
Refer to Blind Spot Detection/Rear Cross Traffic Alert (DIAGNOSTICS)>Inspection Mode .
Is DTC B2350 displayed? (Current malfunction)
Yes : Replace the radar sensor on the opposite side of the sensor that displayed the DTC. Refer 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.