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Home >> Lexus >> 2008 >> IS 250 RWD, Automatic >> Repair and Diagnosis >> External Pages >> Different car >> Section 9 (Steering Column) >> Power Tilt And Power Telescopic Steering Column System >> Diagnosis System

Diagnosis System

WARNING: This page is about a different car, the 2008 Lexus IS F. However, it is still accessible from the selected car via links, so may be relevant.
  1. DESCRIPTION 
    1. When troubleshooting a vehicle with the diagnostic system, the only difference from the usual troubleshooting procedure is connecting the Techstream to the vehicle and reading various data output from the vehicle's multiplex tilt and telescopic ECU.

      The multiplex tilt and telescopic ECU records DTCs when the ECU detects a malfunction in the computer itself or in its circuits.

      To check the DTCs, connect the Techstream to the DLC3 on the vehicle The Techstream enables you to clear the DTCs, activate several actuators, and check the freeze frame data and various forms of steering data.

      Fig 1: Identifying DLC3 Connector Terminals
      G04828034Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  2. DLC3 CHECK 
    1. The multiplex tilt and telescopic ECU uses ISO 15765-4 for communication The terminal arrangement of the DLC3 complies with SAE J1962 and matches the ISO 15765-4 format
      VOLTAGE AND RESISTANCE SPECIFICATION

      Symbol (Terminal No.) Terminal Description Condition Specified Condition
      SIL (7) - SG (5) Bus "+" line During communication 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 11 to 14 V
      CANH (6) - CANL (14) CAN bus line Engine switch off(1) 54 to 67 Ω
      CANH (6) - CG (4) HIGH-level CAN bus line Engine switch off(1) 200 Ω or higher
      CANL (14) - CG (4) LOW-level CAN bus line Engine switch off(1) 200 Ω or higher
      CANH (6) - BAT (16) HIGH-level CAN bus line Engine switch off(1) 6 kΩ or higher
      CANL (14) - BAT (16) LOW-level CAN bus line Engine switch off(1) 6 kΩ or higher
      (1) Before measuring the resistance, leave the vehicle as is for at least 1 minute and do not operate the engine switch, any other switches or the doors.

      HINT

      If the display shows a communication error message after connecting the Techstream cable to the DLC3 and turning the engine switch on (IG), there is a problem either with the vehicle or the Techstream

      • If communication is normal when connecting the Techstream to another vehicle, inspect the DLC3 on the original vehicle.
      • If communication is still not possible when connecting the Techstream to another vehicle, the problem is probably in the Techstream itself. Consult the Service Department listed in the Techstream operator's manual.
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