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Diagnosis Procedure
1.CHECK BACK DOOR SERIAL COMMUNICATION SIGNAL
  1. Turn the power supply mode of the electric motor switch to ON.
  2. Check signal between BCM harness connector and ground using oscilloscope.
    (+)(–)Signal
    (Reference value)
    BCM
    ConnectorTerminal
    B2683Ground
Is the inspection result normal?
INSPECTION END
.
 
2.CHECK BACK DOOR SERIAL COMMUNICATION CIRCUIT
  1. Turn the power supply mode of the electric motor switch to OFF.
  2. Disconnect hands free sensor control unit connector and BCM connector.
  3. Check continuity between hands free sensor control unit harness connector and BCM harness connector.
    Hands free sensor control unitBCMContinuity
    ConnectorTerminal ConnectorTerminal
    B4521B2683Existed
  4. Check continuity between hands free sensor control unit harness connector and ground.
    Hands free sensor control unit—Continuity
    ConnectorTerminal
    B4521GroundNot existed
Is the inspection result normal?
Replace BCM. Refer to Removal and Installation.
Repair or replace harness.