Lexus IS250 · Service Manual HEATER & AIR CONDITIONING SYSTEM

ACTUATOR CHECK

Troubleshooting


ACTUATOR CHECK
  1. Start the engine and warm it up.

  2. Perform the indicator check (Click here).

  3. Push the "R/F" switch to perform the actuator check.
    E116973E01

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

  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.
    E116975E01

    HINT:
    1. The display blinks at 1 second intervals in the step operation.
    2. As an example, the illustration shows that display code 21 is output.
    3. Push the "OFF" switch to finish panel diagnosis.
    4. Push the "AUTO" switch to enter the sensor check mode.

    Step No.
    Display Code
    Conditions
    Blower Level
    Air Mix Damper
    Airflow Vent
    Air Inlet Damper
    Cool Air By-pass 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

  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.
    E116973E02

    HINT:
    1. Push the "OFF" switch to finish panel diagnosis.
    2. Push the "R/F" switch to enter the sensor check mode.

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