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Diagnosis Procedure
1.CHECK REAR SONAR SENSOR SIGNAL LH inner CIRCUIT (SHORT)
  1. Turn ignition switch OFF.
  2. Disconnect sonar control unit connector and rear sonar sensor signal LH inner connector.
  3. Check continuity between sonar control unit harness connector and ground.
Sonar control unitGroundContinuity
ConnectorTerminal
B2021Not existed
Is the inspection result normal?
Replace the rear sonar sensor signal LH inner. Refer to Removal and Installation.
Repair the harness or connector.