ECO Switch Circuit

HEATING / AIR CONDITIONING: AIR CONDITIONING SYSTEM: ECO Switch Circuit
- ECO Switch Circuit

DESCRIPTION

The ECO MODE switch (combination switch assembly) is installed on the instrument panel on the driver side. When the ECO MODE switch (combination switch assembly) is turned on, the air conditioning amplifier assembly receives an ECO MODE switch (combination switch assembly) 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 ECO MODE switch (combination switch assembly) 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 ECO MODE switch (combination switch assembly) operation will be canceled.

WIRING DIAGRAM





INSPECTION PROCEDURE

PROCEDURE

1. READ VALUE USING TECHSTREAM

(a) Connect the Techstream to the DLC3.

(b) Turn the power switch on (IG).

(c) Turn the Techstream on.

(d) Enter the following menus: Body Electrical / Air Conditioner / Data Test.

(e) Check the values by referring to the table below.

Air Conditioner





OK:

ECO MODE switch condition displayed on the Techstream changes with the actual switch operation.

NG -- CHECK HARNESS AND CONNECTOR (ECO MODE SWITCH - AIR CONDITIONING AMPLIFIER ASSEMBLY)

OK -- PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE Symptom Related Diagnostic Procedures

2. CHECK HARNESS AND CONNECTOR (ECO MODE SWITCH - AIR CONDITIONING AMPLIFIER ASSEMBLY)

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

(b) Disconnect the connector from the air conditioning amplifier assembly.

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

Standard Resistance:





NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- Continue to next step.

3. INSPECT ECO MODE SWITCH (COMBINATION SWITCH ASSEMBLY)

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





Standard Resistance:





Text in Illustration





NG -- REPLACE ECO MODE SWITCH (COMBINATION SWITCH ASSEMBLY) Removal

OK -- PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE Symptom Related Diagnostic Procedures