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Diagnosis Procedure
1.CHECK BCM OUTPUT SIGNAL
  1. Turn the power supply mode of the electric motor switch to ON.
  2. Check signal between BCM harness connector and ground using an oscilloscope.
    (+)(−)Signal
    BCM
    ConnectorTerminal
    M1824Ground
Is the inspection result normal?
.
.
 
2.CHECK LIN COMMUNICATION CIRCUIT
  1. Electric motor switch OFF, and then wait for 3 minutes with driver door open.
    note
    • Even after electric motor switch OFF, power is supplied to accessories for a certain amount of time by the AUTO ACC function.
    • When vehicle is operated while on standby, power may be supplied to accessories.
  2. Disconnect following connectors.
    • BCM
    • Power window main switch
    • Front power window motor (driver side)
    • Passenger door mirror control module
    • Sunroof motor assembly
    • Sunshade motor assembly
    Connecting parts other than power window.
  3. Check continuity between BCM harness connector and ground.
    BCM—Continuity
    ConnectorTerminal
    M1824GroundNot existed
Is the inspection result normal?
Replace BCM. Refer to Removal and Installation.
Repair or replace harness.
 
3.CHECK LIN COMMUNICATION SIGNAL
  1. Electric motor switch OFF, and then wait for 3 minutes with driver door open.
    note
    • Even after electric motor switch OFF, power is supplied to accessories for a certain amount of time by the AUTO ACC function.
    • When vehicle is operated while on standby, power may be supplied to accessories.
  2. Disconnect following connectors.
    • Power window main switch
    • Front power window motor (driver side)
  3. Turn the power supply mode of the electric motor switch to ON.
  4. Check signal between power window main switch harness connector, front power window motor (driver side) harness connector and ground using an oscilloscope.
    (+)(−)Signal
    ConnectorTerminal
    Power window main switchD64Ground
    Front power window motor (driver side)D106
Is the inspection result normal?
INSPECTION END
-1Power window main switch: .
-2Front power window motor (driver side): .
 
4.CHECK LIN COMMUNICATION CIRCUIT (POWER WINDOW MAIN SWITCH)
  1. Turn the power supply mode of the electric motor switch to OFF.
  2. Disconnect BCM connector.
  3. Check continuity between BCM harness connector and power window main switch harness connector.
    BCMPower window main switchContinuity
    ConnectorTerminalConnectorTerminal
    M1824D64Existed
Is the inspection result normal?
INSPECTION END
Repair or replace harness.
 
5.CHECK LIN COMMUNICATION CIRCUIT [FRONT POWER WINDOW MOTOR (DRIVER SIDE)]
  1. Turn the power supply mode of the electric motor switch to OFF.
  2. Disconnect BCM connector.
  3. Check continuity between BCM harness connector and front power window motor (driver side) harness connector.
    BCMFront power window motor (driver side)Continuity
    ConnectorTerminalConnectorTerminal
    M1824D106Existed
Is the inspection result normal?
INSPECTION END
Repair or replace harness.