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Diagnosis Procedure
1.CHECK LIN COMMUNICATION SIGNAL
  1. Ignition switch OFF.
  2. Disconnect sunroof motor assembly harness connector.
  3. Ignition switch ON.
  4. Check signal between sunroof motor assembly harness connector and ground using an oscilloscope.
    (+)(−)Signal
    Sunroof motor assembly
    ConnectorTerminal
    R49Ground
Is the inspection result normal?
INSPECTION END
.
 
2.CHECK LIN COMMUNICATION CIRCUIT
  1. Ignition switch OFF.
  2. Disconnect BCM connector.
  3. Check continuity between BCM harness connector and sunroof motor assembly harness connector.
    BCMSunroof motor assemblyContinuity
    ConnectorTerminalConnectorTerminal
    M1824R49Existed
Is the inspection result normal?
Replace BCM. Refer to Removal and Installation.
Repair or replace harness.