Toyota Prius 2010 Repair Manual page 47

PROBLEM SYMPTOMS TABLE
HINT:
Use the table below to help determine the cause of problem symptoms. If multiple suspected areas are listed,
the potential causes of the symptoms are listed in order of probability in the "Suspected Area" column of the
table. Check each symptom by checking the suspected areas in the order they are listed. Replace parts as
necessary.
Inspect the fuses and relays related to this system before inspecting the suspected areas below.
Air Conditioning System
All functions of the A/C system do not operate
Air flow control: No blower operation
Air flow control: No blower control
Air flow control: Insufficient air flow
The blower motor operates by itself or the motor speed changes arbitrarily
(Speed does not change in accordance with automatic or manual control
settings)*1
Temperature control: No cool air comes out
2010 Toyota Prius
Symptom Suspected Area
IG power source circuit
Back-up power source
circuit
Air conditioning control
panel circuit
A/C amplifier
Blower motor circuit
Air conditioning control
panel circuit
A/C amplifier
Blower motor circuit
Air conditioning control
panel circuit
A/C amplifier
Blower motor circuit
A/C amplifier
IG signal circuit
Solar ventilation ECU
Refrigerant volume
Refrigerant pressure
Air conditioning pressure
sensor circuit
Air mix damper control
servo motor circuit
Evaporator temperature
sensor circuit
Room temperature sensor
circuit
Ambient temperature
sensor circuit
See
page
Repair Manual