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Problem Symptoms Table

WARNING: This page is about a different car, the 2004 Toyota Camry. However, it is still accessible from the selected car via links, so may be relevant.
PROBLEM SYMPTOMS TABLE - AIR CONDITIONING SYSTEM

Symptom Suspect Area
Whole functions of the A/C system does not operate.
  1. IG power source circuit
  2. Heater control housing sub-assy (A/C amplifier)
Air Flow Control: No blower operation
  1. Heater relay circuit
  2. Blower motor circuit
  3. Heater control housing sub-assy (A/C amplifier)
Air Flow Control: No blower control
  1. Blower motor circuit
Air Flow Control: Insufficient air flow
  1. Blower motor circuit
  2. Heater control housing sub-assy (A/C amplifier)
Temperature Control: No cool air comes out
  1. Volume of refrigerant
  2. Drive belt tension
  3. Refrigerant pressure
  4. Compressor lock sensor circuit
  5. Compressor circuit
  6. Pressure switch circuit
  7. Air mix control servomotor circuit
  8. Air mix damper position sensor circuit
  9. Room temp, sensor circuit
  10. Ambient temp, sensor circuit
  11. Vehicle speed signal circuit
  12. Heater control housing sub-assy (A/C amplifier)
Temperature Control: No warm air comes out
  1. Air mix control servomotor circuit
  2. Air mix damper position sensor circuit
  3. Ambient temp, sensor circuit
  4. Vehicle speed signal circuit
  5. Room temp, sensor circuit
  6. Evaporator temp, sensor circuit
  7. Heater control housing sub-assy (A/C amplifier)
  8. Heater radiator
Temperature Control: Out coming air is warmer or cooler than the set temperature or response is slow.
  1. Room temp, sensor circuit
  2. Ambient temp, sensor circuit
  3. Vehicle speed signal circuit
  4. Solar sensor circuit
  5. Air mix damper position sensor circuit
  6. Air mix control servomotor circuit
  7. Water temp, sensor circuit
  8. Heater control housing sub-assy (A/C amplifier)
Temperature Control: Unable to control temperature (only Max. cool or Max. warm)
  1. Air mix control servomotor circuit
  2. Air mix damper position sensor circuit
  3. Heater control housing sub-assy (A/C amplifier)
No air inlet control
  1. Air inlet damper control servomotor circuit
  2. Air inlet damper position sensor circuit
  3. Heater control housing sub-assy (A/C amplifier)
No air outlet control
  1. Air outlet damper position sensor circuit
  2. Air outlet control servomotor circuit
  3. Heater control housing sub-assy (A/C amplifier)
Engine idle up does not occur, or is continuous
  1. Compressor circuit
  2. Heater control housing sub-assy (A/C amplifier)
Set temperature value displayed does not much up with operation of temperature control switch.
  1. Heater control housing sub-assy (A/C amplifier)
Brightness does not changes when rheostat volume or light control switch it turned.
  1. Illumination light system
  2. Heater control housing sub-assy (A/C amplifier)
Unable to access the diagnosis mode.
  1. Heater control housing sub-assy (A/C amplifier)
DTC not recorded. Set mode is cleared when IG switch is turned off.
  1. Back-up power source circuit
  2. Heater control housing sub-assy (A/C amplifier)
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