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Diagnosis System

  1. DESCRIPTION 
    1. The defogger system data can be read through 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.
  2. CHECK DLC3 
    1. The vehicle uses the 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
      G05197590Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      Standard voltage 

      TERMINAL DESCRIPTION SPECIFIED CONDITION CHART

      Symbols (Terminal No.) Terminal Description Condition Specified Condition
      SIL (7) - SG (5) Bus "+" line During transmission Pulse generation
      BAT (16) - Body ground Battery positive Always 11 to 14 V

      Standard resistance 

      TERMINAL DESCRIPTION SPECIFIED CONDITION CHART

      Symbols (Terminal No.) Terminal Description Condition Specified Condition
      CG (4) - Body ground Chassis ground Always Below 1 Ω
      SG (5) - Body ground Signal ground Always Below 1 Ω
      CANH (6) - CANL (14) CAN bus line Engine switch off 54 to 67 Ω
      CANH (6) - Battery positive (+) HIGH-level CAN bus line Engine switch off 1 MΩ or higher
      CANH (6) - CG (4) HIGH-level CAN bus line Engine switch off 3 MΩ or higher
      CANL (14) - Battery positive (+) LOW-level CAN bus line Engine switch off 1 MΩ or higher
      CANL (14) - CG (4) LOW-level CAN bus line Engine switch off 3 MΩ or higher

      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 (with CAN VIM) to the DLC3, turn the engine 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.
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