AIR CONDITIONING SYSTEM ECO Switch Circuit

DESCRIPTION

The combination switch assembly (ECO MODE switch) is installed on the upper console panel. When the combination switch assembly (ECO MODE switch) is turned on, the A/C amplifier receives an combination switch assembly (ECO MODE switch) ON signal and controls the air conditioning to enhance fuel efficiency.

When the heater is on, the engine ON request coolant temperature will be set to a lower level. Thus, the length of time that the engine operates to generate the heat necessary to operate the heater will be limited. When the engine coolant temperature drops, the amount of air flow of the blower motor will also decrease. If FOOT/DEF or DEF is selected, or if the temperature is set to MAX HOT, the fuel efficiency control due to the combination switch assembly (ECO MODE switch) operation will be canceled.

When the air conditioning is used to cool the vehicle, the power consumption of the compressor will be limited. Initially, the air conditioning will operate normally until the cabin temperature stabilizes. After the cabin temperature stabilizes, the power consumption of the compressor will be limited while stabilizing the cabin temperature. If the temperature is set to MAX COOL, the fuel efficiency control due to the combination switch assembly (ECO MODE switch) operation will be canceled.

WIRING DIAGRAM

A003SDYE05

INSPECTION PROCEDURE

PROCEDURE


  1. INSPECT AIR CONDITIONING AMPLIFIER


    1. A003UY1E02
      Text in Illustration
      *1

      Component with harness connected

      (A/C Amplifier)

      Remove the A/C amplifier with the connectors still connected.

    2. Measure the voltage according to the value(s) in the table below.

      Standard Voltage
      Tester Connection Condition Specified Condition
      E30-15 (ECOS) - Body ground

      Power switch on (IG)

      ECO MODE switch off (when switch is not pressed)

      		 11 to 14 V
      E30-15 (ECOS) - Body ground

      Power switch on (IG)

      ECO MODE switch on (when switch is pressed)

      		 Below 1 V

    NG

    CHECK HARNESS AND CONNECTOR (ECO MODE SWITCH - BODY GROUND) Click here

    OK

    PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE Click here

  2. CHECK HARNESS AND CONNECTOR (ECO MODE SWITCH - BODY GROUND)


    1. A003T5GE01
      Text in Illustration
      *1

      Front view of wire harness connector

      (to Combination Switch Assembly (ECO MODE Switch))

      Disconnect the E115 connector from the combination switch assembly (ECO MODE switch).

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      E115-3 (E) - Body ground Always Below 1 Ω

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  3. INSPECT COMBINATION SWITCH ASSEMBLY (ECO MODE SWITCH)


    1. A003UJAE01
      Text in Illustration
      *1

      Component without harness connected

      (Combination Switch Assembly (ECO MODE Switch))

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      E115-2 (ECU) - E115-3 (E)

      ECO MODE switch off

      (when switch is not pressed)

      		 10 kΩ or higher
      E115-2 (ECU) - E115-3 (E)

      ECO MODE switch on

      (when switch is pressed)

      		 Below 1 Ω

    NG

    REPLACE COMBINATION SWITCH ASSEMBLY (ECO MODE SWITCH) Click here

    OK

  4. CHECK HARNESS AND CONNECTOR (A/C AMPLIFIER - ECO MODE SWITCH)


    1. Disconnect the E30 connector from the A/C amplifier.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      E30-15 (ECOS) - E115-2 (ECU) Always Below 1 Ω
      E30-15 (ECOS) - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

    REPLACE A/C AMPLIFIER Click here