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Diagnosis System

  1. DESCRIPTION 
    1. The driver side power window regulator motor (power window ECU) controls the power window control system functions on the vehicle. Power window control system data can be read through the Data Link Connector 3 (DLC3) of the vehicle. When the system seems to be malfunctioning, use Techstream to check for malfunctions and perform repairs.
  2. CHECK DLC3 
    1. The vehicle's ECU uses ISO 15765-4 for communication protocol. The terminal arrangement of the DLC3 complies with SAE J1962 and matches the ISO 15765-4 format.
      Fig 1: Identifying DLC3 Connector Terminals
      GTY103674Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      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* 54 to 69 Ω
      CANH (6) - CG (4) HIGH-level CAN bus line Ignition switch OFF* 200 Ω or higher
      CANL (14) - CG (4) LOW-level CAN bus line Ignition switch OFF* 200 Ω or higher
      CANH (6) - BAT (16) HIGH-level CAN bus line Ignition switch OFF* 6 kΩ or higher
      CANL (14) - BAT (16) LOW-level CAN bus line Ignition switch OFF* 6 kΩ or higher
      NOTE:

      *: 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 doors.

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

    2. Connect the cable of Techstream to the DLC3, turn the ignition switch to the ON position and attempt to use Techstream. If the screen displays a communication error message, a problem exists in the vehicle side of the tester side.

      HINT: 

      • If communication is normal when the tool is connected to another vehicle, inspect the DLC3 on the original vehicle.
      • If communication is still impossible when the tool is connected to another vehicle, the problem is probably in the tool itself. Consult the Service Department listed in the tool's instruction manual.
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