AIR CONDITIONING SYSTEM ECO Switch Circuit

DTC Code DTC Name
ECO Switch Circuit

DESCRIPTION

When the combination switch assembly (ECO mode switch) is turned on, the air conditioning amplifier assembly receives an combination switch assembly (ECO mode switch) ON signal and controls the air conditioning to enhance fuel efficiency.

WIRING DIAGRAM

E261769E17

CAUTION / NOTICE / HINT

Note:

When the servo motor or air conditioning amplifier assembly is replaced, be sure to perform servo motor initialization.

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PROCEDURE

  1. READ VALUE USING GTS (ECO SWITCH)

    1. Connect the GTS to the DLC3.

    2. Turn the power switch on (IG).

    3. Turn the GTS on.

    4. Enter the following menus: Body Electrical / Air Conditioner / Data List.

    5. Check the values by referring to the table below.

    Body Electrical > Air Conditioner > Data List

    Tester Display

    Measurement Item

    Range

    Normal Condition

    Diagnostic Note

    ECO Switch

    Combination switch assembly (ECO mode switch)

    ON or OFF

    ON: Combination switch assembly (ECO mode switch) being turned and held at ECO position

    OFF: Combination switch assembly (ECO mode switch) not turned

    -

    Body Electrical > Air Conditioner > Data List

    Tester Display

    ECO Switch

    OK

    Combination switch assembly (ECO mode switch) condition displayed on the GTS changes with the actual switch operation.

    Result

    Proceed to

    OK

    NG
    OK

    PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE

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    NG

  2. INSPECT COMBINATION SWITCH ASSEMBLY (ECO MODE SWITCH)

    1. Remove the combination switch assembly (ECO mode switch).

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    2. Inspect the combination switch assembly (ECO mode switch).

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    Result

    Proceed to

    OK

    NG
    NG

    REPLACE COMBINATION SWITCH ASSEMBLY (ECO MODE SWITCH)

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    OK

  3. CHECK HARNESS AND CONNECTOR (COMBINATION SWITCH ASSEMBLY [ECO MODE SWITCH] - AIR CONDITIONING AMPLIFIER ASSEMBLY AND BODY GROUND)

    1. Disconnect the G191 combination switch assembly (ECO mode switch) connector.

    2. Disconnect the G81 air conditioning amplifier assembly connector.

    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection

      Condition

      Specified Condition

      G81-24 (ECOS) - G191-4 (ECU)

      Always

      Below 1 Ω

      G81-24 (ECOS) or G191-4 (ECU) - Body ground

      Always

      10 kΩ or higher

      G191-6 (MSW2) - Body ground

      Always

      Below 1 Ω

    Result

    Proceed to

    OK

    NG
    OK

    REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY

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    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR