FixVault
Home › Lexus › 2007 › GS 450h › Repair and Diagnosis › Body & Frame › Door Locks › Door Lock › Wireless Door Lock Control System › Diagnosis System

Diagnosis System

  1. DESCRIPTION 
    1. Wireless door lock control system data and Diagnostic Trouble Codes (DTCs) 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 ECU uses ISO 15765-4 for communication. The terminal arrangement of the DLC3 complies with ISO 15031-3 and matches the ISO 15765-4 format.
      Fig 1: Identifying DLC3 Connector Terminal
      G04979850Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      ECU TERMINAL REFERENCE 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 10 to 14 V
      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 Power switch OFF(1) 54 to 69 Ω
      CANH (6) - CG (4) HIGH-level CAN bus line Power switch OFF(1) 200 Ω or higher
      CANL (14) - CG (4) LOW-level CAN bus line Power switch OFF(1) 200 Ω or higher
      CANH (6) - Battery positive HIGH-level CAN bus line Power switch OFF(1) 6 kΩ or higher
      CANL (14) - Battery positive LOW-level CAN bus line Power switch OFF(1) 6 kΩ or higher
      NOTE:
      (1) Before measuring the resistance, leave the vehicle as is for at least 1 minute and do not operate the power switch, any switches or doors.

      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 power switch ON (IG) and attempt to use the tester. If the screen displays the message UNABLE TO CONNECT TO VEHICLE, 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 is probably in the tester itself. Consult the Service Department listed in the tester's instruction manual.
        Fig 2: Connecting Cable Of Intelligent Tester To DLC3
        G05310970Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
About FixVault