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.
Symptom | Suspected Area | See page |
|---|---|---|
All functions of the A/C system do not operate |
IG power source circuit |
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Back-up power source circuit |
|
|
Air conditioning control panel circuit |
|
|
A/C amplifier |
|
|
Air flow control: No blower operation |
Blower motor circuit |
|
Air conditioning control panel circuit |
|
|
A/C amplifier |
|
|
Air flow control: No blower control |
Blower motor circuit |
|
Air conditioning control panel circuit |
|
|
A/C amplifier |
|
|
Air flow control: Insufficient air flow |
Blower motor circuit |
|
A/C amplifier |
|
|
Temperature control: No cool air comes out |
Refrigerant volume |
- |
Refrigerant pressure |
|
|
Air conditioning pressure sensor circuit |
|
|
Air conditioning compressor magnetic clutch circuit*1 |
|
|
Compressor lock sensor circuit*1 |
|
|
Compressor solenoid circuit |
|
|
Air mix damper control servo motor circuit (for Driver side) |
|
|
Air mix damper control servo motor circuit (for Front passenger side) |
|
|
Evaporator temperature sensor circuit |
|
|
Room temperature sensor circuit |
|
|
Ambient temperature sensor circuit |
|
|
Air conditioning control panel circuit |
|
|
Expansion valve |
|
|
A/C amplifier |
|
|
ECM*1 |
|
|
ECM*2 |
|
|
Temperature control: No warm air comes out |
Air mix damper control servo motor circuit (for Driver side) |
|
Air mix damper control servo motor circuit (for Front passenger side) |
|
|
Evaporator temperature sensor circuit |
|
|
Room temperature sensor circuit |
|
|
Ambient temperature sensor circuit |
|
|
Air conditioning control panel circuit |
|
|
A/C amplifier |
|
|
ECM*1 |
|
|
ECM*2 |
|
|
Temperature control: Output air is warmer or cooler than the set temperature or response is slow |
Refrigerant volume |
- |
Refrigerant pressure |
|
|
Air conditioning compressor magnetic clutch circuit*1 |
|
|
Compressor lock sensor circuit*1 |
|
|
Compressor solenoid circuit |
|
|
Solar sensor circuit (for Driver side) |
|
|
Solar sensor circuit (for Front passenger side) |
|
|
Room temperature sensor circuit |
|
|
Ambient temperature sensor circuit |
|
|
Air mix damper control servo motor circuit (for Driver side) |
|
|
Air mix damper control servo motor circuit (for Front passenger side) |
|
|
Air inlet damper control servo motor circuit |
|
|
Air conditioning control panel circuit |
|
|
Radiator unit sub-assembly |
|
|
Expansion valve |
|
|
A/C amplifier |
|
|
ECM*1 |
|
|
ECM*2 |
|
|
Temperature control: No temperature control (only Max. cool or Max. warm) |
Air mix damper control servo motor circuit (for Driver side) |
|
Air mix damper control servo motor circuit (for Front Passenger side) |
|
|
Room temperature sensor circuit |
|
|
Ambient temperature sensor circuit |
|
|
Evaporator temperature sensor circuit |
|
|
Solar sensor circuit (for Driver side) |
|
|
Solar sensor circuit (for Front passenger side) |
|
|
Air conditioning control panel circuit |
|
|
A/C amplifier |
|
|
No air inlet control |
Air inlet damper control servo motor circuit |
|
Air conditioning control panel circuit |
|
|
A/C amplifier |
|
|
No air flow mode control |
Air outlet damper control servo motor circuit |
|
Air conditioning control panel circuit |
|
|
A/C amplifier |
|
|
Engine does not start for heater |
Air conditioning compressor magnetic clutch circuit*1 |
|
Compressor lock sensor circuit*1 |
|
|
Compressor solenoid circuit |
|
|
A/C amplifier |
|
|
Blinking of A/C indicator |
Compressor solenoid circuit |
|
A/C amplifier |
|
|
Diagnostic trouble codes (DTCs) are not recorded. Set mode is cleared when ignition switch is off. |
Back-up power source circuit |
|
A/C amplifier |
|
- *1: for 2GR-FE
- *2: for 1AR-FE
Test yourself
A quick Toyota Venza quiz: every answer comes with an explanation and a link to the manual page.