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Home >> Lexus >> 2007 >> GS 450h >> Repair and Diagnosis >> Suspension >> Suspension Control Systems >> Suspension Control >> Adaptive Variable Suspension System >> Diagnosis System

Diagnosis System

  1. DIAGNOSIS SYSTEM 
    1. Inspect the battery voltage.

      Battery voltage: 11 to 14 V 

      If the voltage is below 11 V, recharge or replace the battery before proceeding.

    2. Check DLC3.

      The absorber control ECU uses the CAN system and ISO 15765-4 for communication. The terminal arrangement of the DCL3 complies with SAE J1962 and matches the ISO 15765-4 format.

      Verify the conditions listed in the table below:

      Fig 1: Identifying DLC3 Connector Terminals
      G04828034Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      VOLTAGE AND RESISTANCE SPECIFICATION

      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
      SIL (7) - SG (5) Bus "+" line During transmission Pulse generation
      BAT (16) - Body ground Battery positive Always 10 to 14 V
      CANH (6) - CANL (14) CAN bus line Power switch OFF(1) 54 to 69 Ω
      CANH (6) - BAT (16) HIGH-level CAN bus line Power switch OFF(1) 6 kΩ or higher
      CANH (6) - CG (4) HIGH-level CAN bus line Power switch OFF(1) 200 Ω or higher
      CANL (14) - BAT (16) LOW-level CAN bus line Power switch OFF(1) 6 kΩ or higher
      CANL (14) - CG (4) LOW-level CAN bus line Power switch OFF(1) 200 Ω or higher
      (1) Before measuring the resistance, leave the vehicle as is for at least 1 minute and do not operate the power 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.

      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 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. DTCs (Normal mode)
      1. DTCs are memorized in the absorber control ECU and read by using the intelligent tester (see FAIL-SAFE CHART  ).
        Fig 2: Connecting Intelligent Tester To DLC3
        G05297721Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    4. Test Mode (SIGNAL CHECK)
      1. By switching from normal mode into Test Mode, you can inspect the absorber control switch and each acceleration sensor (see TEST MODE PROCEDURE  ).
    5. Check the absorber control indicator light.
      1. Turn the power switch ON (IG).
      2. Check that the absorber control indicator light comes on for 2 seconds.

        If the indicator light check result is not normal, proceed to troubleshooting for the absorber control indicator light circuit below.

        ABSORBER CONTROL INDICATOR LIGHT TROUBLE AREA

        Trouble area See procedure
        Absorber control indicator light (Remains on) ABSORBER CONTROL INDICATOR LIGHT REMAINS ON 
        Absorber control indicator light (Does not come on) ABSORBER CONTROL INDICATOR LIGHT DOES NOT COME ON 
        Fig 3: Identifying Absorber Control Indicator Light
        G05296375Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
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