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 B2301 REAR RADAR CIRCUIT HIGH |
2.CHECK DTC. Read the DTC. Read Diagnostic Trouble Code (DTC) > OPERATION | Is DTC B2301 displayed- (Current malfunction) | Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC B2301 REAR RADAR CIRCUIT HIGH | 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 B2301 REAR RADAR CIRCUIT HIGH |
4.CHECK HARNESS (OPEN 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 outer mirror assembly connector (harness side). Connector & terminal Radar sensor LH (R25) No. 4 — (D5) No. 2: Radar sensor RH (R61) No. 4 — (D15) No. 2: | Is the resistance less than 1 -- | Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC B2301 REAR RADAR CIRCUIT HIGH | Repair the open circuit of harness between radar sensor connector and outer mirror assembly connector. |
5.CHECK HARNESS (SHORT CIRCUIT TO POWER SUPPLY). 1) Turn the ignition switch to ON. 2) Using a tester, measure the voltage 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 voltage less than 1 V- | Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC B2301 REAR RADAR CIRCUIT HIGH | Repair the short circuit to power supply in harness between radar sensor connector and outer mirror assembly connector. |
6.CHECK CONNECTOR. Check the radar sensor connector and the outer mirror assembly connector. | Is there any fault- (Insecure connection, poor contact, etc.) | | Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC B2301 REAR RADAR CIRCUIT HIGH |
7.CHECK OUTER MIRROR ASSEMBLY. Perform unit-check for the outer mirror assembly. Outer Mirror Assembly | | Replace the outer mirror assembly. Outer Mirror Assembly | Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC B2301 REAR RADAR CIRCUIT HIGH |
8.CHECK BSD/RCTA. 1) Restore the vehicle to its original state. 2) Perform the Inspection Mode. Inspection Mode | Is DTC B2301 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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