Toyota Prius 2010 Repair Manual page 197

ECO Switch Circuit
DESCRIPTION
The integration control and panel sub-assembly (ECO MODE switch) is installed on the instrument panel on the
driver side. When the integration control and panel sub-assembly (ECO MODE switch) is turned on, the A/C
amplifier receives an integration control and panel sub-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 integration
control and panel sub-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 integration control
and panel sub-assembly (ECO MODE switch) operation will be canceled.
WIRING DIAGRAM
INSPECTION PROCEDURE
PROCEDURE
2010 Toyota Prius Repair Manual