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Home >> Lexus >> 2004 >> ES 330 >> Repair and Diagnosis >> External Pages >> Different car >> Section 307 (Air Conditioning System - Diagnostics) >> Air Conditioning System >> Problem Symptoms Table
July 1: So it begins. Don't worry, this is not in the correct legal jurisdiction!

Problem Symptoms Table

WARNING: This page is about a different car, the 2005 Toyota Sienna. However, it is still accessible from the selected car via links, so may be relevant.

Front A/C: 

PROBLEM SYMPTOMS TABLE - FRONT A/C

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

Rear A/C: 

PROBLEM SYMPTOMS TABLE - REAR A/C

Symptom Suspect Area
Whole functions of the A/C system does not operate
  1. A/C amplifier assy
  2. Rear air conditioning relay circuit
  3. Rear air conditioning control panel circuit
Air Flow Control: No blower operation
  1. Rear blower motor circuit
  2. A/C amplifier assy
Air Flow Control: No blower control
  1. Rear blower motor circuit
  2. A/C amplifier assy
Air Flow Control: Insufficient air out
  1. Rear blower motor circuit
  2. A/C amplifier assy
Temperature Control: Cool air does not come out
  1. Volume of refrigerant
  2. Drive belt tension
  3. Refrigerant pressure
  4. Compressor circuit
  5. Pressure switch circuit
  6. Ambient temp, sensor circuit
  7. Rear evaporator temperature sensor circuit
  8. A/C amplifier assy
Temperature Control: Warm air does not come out
  1. Rear air mix control servomotor circuit
  2. Rear air mix damper position sensor circuit
  3. Ambient temp, sensor circuit
  4. Rear room temp, sensor circuit
  5. Rear evaporator temp, sensor circuit
  6. A/C amplifier assy
  7. Heater radiator
Temperature Control: Output air is warmer or cooler than the set temperature or response is slow
  1. Rear room temp, sensor circuit
  2. Ambient temp, sensor circuit
  3. Rear air mix damper position sensor circuit
  4. Rear air mix control servomotor circuit
  5. A/C amplifier assy
Temperature Control: No temperature control (only Max. cool or Max. hot)
  1. Rear air mix control servomotor circuit
  2. Rear air mix damper position sensor circuit
  3. A/C amplifier assy
No air outlet control
  1. Rear air outlet damper position sensor circuit
  2. Rear air outlet control servomotor circuit
  3. A/C amplifier assy
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