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Diagnosis System

  1. DESCRIPTION 
    1. The power window control system data can be read from the Data Link Connector 3 (DLC3) of the vehicle. When the system seems to be malfunctioning, use the intelligent tester to check for malfunctions and perform repairs.
      Fig 1: Identifying DLC3 Connector Terminals (CANL & BAT)
      G04828034Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  2. CHECK DLC3 
    1. The ECU uses ISO 15765-4 communication. The terminal arrangement of the DLC3 complies with SAE J 1962 and matches the ISO 15765-4 format.
      Fig 2: Connecting Cable Of Intelligent Tester To DLC3
      G05274241Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      CONNECTOR TERMINAL SPECIFIED CONDITION

      Symbols (Terminal No.) Terminal Description Condition Specified Condition
      SIL (7) - SG (5) Bus "+" line During transmission Pulse generation
      CG (4) - Body ground Chassis ground Always Below 1 Ω
      SG (5) - Body ground Signal ground Always Below 1 Ω
      BAT (16) - Body ground Battery positive Always 10 to 14 V
      CANH (6) - CANL (14) CAN bus line Ignition Switch OFF(1) 54 to 69 Ω
      CANH (6) - CG (4) HIGH-level CAN bus line Ignition Switch OFF(1) 200 Ω or more
      CANL (14) - CG (4) LOW-level CAN bus line Ignition Switch OFF(1) 200 Ω or more
      CANH (6) - BAT (16) HIGH-level CAN bus line Ignition Switch OFF(1) 6 kΩ or more
      CANL (14) - BAT (16) LOW-level CAN bus line Ignition Switch OFF(1) 6 kΩ or more
      NOTE:
      (1) Before measuring the resistance, leave the vehicle as is for at least 1 minute and do not operate the ignition switch, any other switches or the door.

      If the result is not as specified, the DLC3 may have a malfunction. Repair or replace the harness and connector.

      HINT:

      Connect the cable of the intelligent tester to the DLC3, turn the ignition switch on (IG) and attempt to use the tester. If the display indicates that a communication error has occurred, there is a problem either with the vehicle or with the tester.

      • If communication is normal when the tester is connected to another vehicle, inspect the DLC3 of the original vehicle.
      • If communication is still not possible when the tester is connected to another vehicle, the problem may be in the tester itself. Consult the Service Department listed in the tester's instruction manual.
  3. CHECK DIAGNOSIS 

    HINT:

    If there is a malfunction in the pulse sensor, manually operating the power window switch will cause the power window switch light to blink. The light continues to blink for 43 seconds or until the ignition switch is turned off. After 43 seconds, the power window switch light remains on.

    1. Turn the ignition switch on (IG).
    2. Manually operate the power window master switch or power window switch on each door.
      Fig 3: Identifying Power Window Switch
      G05006550Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    3. Check the blinking pattern of the AUTO light.
      Fig 4: Identifying AUTO Light - Blinking Pattern
      G05205071Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      1. If pattern (A) is displayed, reset the power window. regulator motor.
      2. If pattern (B) or (C) is displayed, check the wire harness.
      3. If the normal pattern is displayed, replace the power window regulator master switch.
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