AIR CONDITIONING SYSTEM ECO Switch Circuit

DESCRIPTION

The ECO drive mode control is activated for the air conditioning system by operating the combination switch assembly.

When the air conditioning system control cannot be performed while in ECO drive mode due to a malfunction etc., the following causes are possible.

Malfunction Status Factor

  • Even if ECO drive mode is selected, the air vent cannot be controlled

  • Even if ECO drive mode is not selected, the air vent cannot be controlled

  • Air conditioning amplifier assembly malfunction

  • Combination switch assembly malfunction

  • Harness or connector

WIRING DIAGRAM

B000RLRE25
*a Combination Switch Assembly
*b Air Conditioning Amplifier Assembly

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. Read the Data List according to the display on the GTS.


      Body Electrical > Air Conditioner > Data List
      Tester Display Measurement Item Range Normal Condition Diagnostic Note
      ECO Switch Combination switch assembly OFF or ON

      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 condition displayed on the GTS changes with the actual switch operation.
      Result
      Proceed to
      OK
      NG

    OK

    REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY Click here

    NG

  2. INSPECT COMBINATION SWITCH ASSEMBLY (ECO MODE SWITCH)


    1. Remove the combination switch assembly.

      Click here

    2. Inspect the combination switch assembly.

      Click here

      Result
      Proceed to
      OK
      NG

    NG

    REPLACE COMBINATION SWITCH ASSEMBLY (ECO MODE SWITCH) Click here

    OK

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


    1. Disconnect the P85 combination switch assembly connector.

    2. Disconnect the P57 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
      P85-7 (ECU) - P57-20 (ECOS) Always Below 1 Ω
      P85-1 (GND) - Body ground Always Below 1 Ω
      P85-7 (ECU) or P57-20 (ECOS) - Other terminals and body ground Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    OK

    REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR