ECO Switch Circuit

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

DESCRIPTION

When the combination switch assembly (ECO switch) is turned on, the air conditioning amplifier assembly receives an ECO 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 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 switch) 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 switch condition displayed on the Techstream changes with the actual switch operation.

NG -- INSPECT COMBINATION SWITCH ASSEMBLY (ECO SWITCH)

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

2. INSPECT COMBINATION SWITCH ASSEMBLY (ECO SWITCH)

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





Standard Resistance:





Text in Illustration





NG -- REPLACE COMBINATION SWITCH ASSEMBLY (ECO SWITCH) Removal
OK -- Continue to next step.

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

(a) Disconnect the H72 combination switch assembly (ECO switch) connector.

(b) Disconnect the H85 air conditioning amplifier assembly connector.

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

Standard Resistance:





NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR

OK -- REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY Removal