AIR CONDITIONING SYSTEM ECO Switch Circuit

DESCRIPTION

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

PROCEDURE

1. Click here

   READ VALUE USING GTS

   
   

   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 Test.

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

      Table 1. Air Conditioner

      Tester Display	Measurement Item/Range	Control Range	Diagnostic Note
      ECO Switch	ECO mode switch (integration control and panel assembly) / OFF or ON	ECO mode switch (integration control and panel assembly) not turned: OFF	-
      		ECO mode switch (integration control and panel assembly) being turned and held at ECO position: ON

      OK
      ECO mode switch (integration control and panel assembly) condition displayed on the GTS changes with the actual switch operation.

   
   
   • OK

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

   • NGClick here
2. Click here

   INSPECT ECO MODE SWITCH (INTEGRATION CONTROL AND PANEL ASSEMBLY)

   
   

   1. Remove the ECO mode switch (integration control and panel assembly) (Click here).

   2. 

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

      Standard Resistance
      Tester Connection Condition Specified Condition 4 (ECU) - 5 (E) ECO mode switch (integration control and panel assembly) not turned 10 kΩ or higher 4 (ECU) - 5 (E) ECO mode switch (integration control and panel assembly) being turned and held at ECO position Below 1 Ω

      Table 2. Text in Illustration

      *a	Component without harness connected (ECO Mode Switch (Integration Control and Panel Assembly))

   
   
   • OKClick here
   • NG

     REPLACE ECO MODE SWITCH (INTEGRATION CONTROL AND PANEL ASSEMBLY) (Click here)

3. Click here

   CHECK HARNESS AND CONNECTOR (ECO MODE SWITCH (INTEGRATION CONTROL AND PANEL ASSEMBLY) - AIR CONDITIONING AMPLIFIER ASSEMBLY)

   
   

   1. Disconnect the H54 air conditioning amplifier assembly connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition H54-4 (ECOS) - H71-4 (ECU) Always Below 1 Ω H54-4 (ECOS) - Body ground Always 10 kΩ or higher

   
   
   • OKClick here
   • NG

     REPAIR OR REPLACE HARNESS OR CONNECTOR

4. Click here

   CHECK HARNESS AND CONNECTOR (ECO MODE SWITCH (INTEGRATION CONTROL AND PANEL ASSEMBLY) - BODY GROUND)

   
   

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

      Standard Resistance
      Tester Connection Condition Specified Condition H71-5 (E) - Body ground Always Below 1 Ω

   
   
   • OK

     REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY (Click here)

   • NG

     REPAIR OR REPLACE HARNESS OR CONNECTOR