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Home >> Lexus >> 2008 >> IS 250 RWD, Automatic >> Repair and Diagnosis >> External Pages >> Different car >> Section 28 (Heating / Air Conditioning System) >> Air Conditioning 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. Air conditioning system data and the 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 Techstream to check for malfunctions and perform troubleshooting.
  2. CHECK DLC3 
    1. Check the DLC3 (See HOW TO TROUBLESHOOT ECU CONTROLLED SYSTEMS ).
  3. LIST OF OPERATION METHODS 
    1. By operating each of the air conditioning control switches as shown in the diagram below, it is possible to enter diagnostic check mode.
      Fig 1: Air Conditioning Control Switches Operation Diagram
      G05755212Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  4. INDICATOR CHECK 
    1. Turn the engine switch off.
    2. Turn the engine switch on (IG) while pressing the A/C control "AUTO" switch and "R/F" switch simultaneously. Hold both switches until the indicator check screen appears.
      Fig 2: Identifying "AUTO" Switch And "R/F" Switch
      G05755213Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    3. The indicator check is automatically performed when panel diagnosis is activated. Check that the indicators light up and go off at 1 second intervals 4 times in succession

      HINT:

      • The sensor check automatically starts when the indicator check is completed
      • Press the "OFF" switch to cancel the check mode.
      • If a navigation system is installed, the indicator will blink and the buzzer will sound.
      Fig 3: Indicator Blinking Pattern And Switches
      G05755214Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  5. SENSOR CHECK (DTC CHECK) 
    1. Start the engine and warm it up.
    2. Perform the indicator check

      HINT

      After the indicator check is completed, the system enters DTC check mode automatically

    3. Read the DTC displayed on the panel.
      NOTE:
      • In sensor check mode, which is automatically entered after indicator check mode, troubleshooting may be partially performed. Be sure to perform the actuator check, and then the sensor check again.
      • If the check is performed in a dark place, DTC 21 or 24 may be displayed even though the system is normal.

      HINT.

      Refer to the DTC chart (Diagnostic Trouble Code chart) for details of the codes (See DIAGNOSTIC TROUBLE CODE CHART  )

      • When there are no problems, DTC 00 is output.
      • As an example, the illustration shows that display code 21 is output.
        Fig 4: Diagnostic Trouble Code On Display
        G05755215Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    4. If the steps are difficult to read because they change automatically, push the "UpDr" switch to display the steps one at a time so that they can be read easily. The items are displayed step by step each time the "UpDr" switch is pushed.
      • Push the "OFF" switch to finish panel diagnosis.
      • Push the "R/F" switch to enter actuator check mode
        Fig 5: Identifying "OFF" Switch And "R/F" Switch
        G05755216Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    5. Clear the DTC
      1. During the sensor check, press the "FRONT DEF" switch and "REAR DEF" switch at the same time
      Fig 6: Identifying "FRONT DEF" Switch And "REAR DEF" Switch
      G05755217Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  6. ACTUATOR CHECK 
    1. Start the engine and warm it up
    2. Perform the indicator check
    3. Push the "R/F" switch to perform the actuator check

      HINT:

      Be sure to perform the actuator check after starting the engine.

      Fig 7: Locating "R/F" Switch
      G05755218Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    4. As the actuator check is repeated from steps 1 to 10 at 1 second intervals, check the temperature and air flow visually and by hand.

      HINT:

      • The display blinks at 1 second intervals in the step operation.
      • Push the "OFF" switch to finish panel diagnosis.
      • Push the "AUTO" switch to enter sensor check mode.
        Fig 8: Identifying "OFF" Switch And "AUTO"
        G05755219Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      DISPLAY CODE AND CONDITION

      Step No. Display Code Condition
      Blower Level Air Mix Damper Air flow Vent Air Inlet Damper Cool Air Bypass Damper Compressor
      1 0 0 0% open FACE FRESH -14% OFF
      2 1 1 0% open FACE FRESH -14% OFF
      3 2 17 0% open FACE RECIRCULATION / FRESH -14% ON
      4 3 17 0% open FACE RECIRCULATION 113 50% ON
      5 4 17 50% open B/L RECIRCULATION 113 50% ON
      6 5 17 50% open B/L RECIRCULATION 113 50% ON
      7 6 17 50% open FOOT FRESH 113 50% ON
      8* 7 17 100% open FOOT-0 FRESH 113 50% ON
      9 8 17 100% open F/D FRESH 113 50% ON
      10 9 31 100% open DEF FRESH 113 50% ON
      HINT:
      *: This only occurs for check mode.

      The air outlets remain the same but the air mix damper position will differ.

    5. If the steps are difficult to read because they change automatically, push the "UpDr" switch to display the steps one at a time so that they can be read easily The items are displayed step by step each time the "UpDr" switch is pushed.

      HINT

      • Push the "OFF" switch to finish panel diagnosis
      • Push the "R/F" switch to enter sensor check mode.
      Fig 9: Locating "UPDR" Switch
      G05755216Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
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