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Home >> Toyota >> 2001 >> Sienna CE >> Repair and Diagnosis >> External Pages >> Different car >> Section 477 (Air Conditioning System - Diagnosis) >> Problem Symptoms Table >> Front A/C

Front A/C

WARNING: This page is about a different car, the 2003 Lexus LS 430. However, it is still accessible from the selected car via links, so may be relevant.
PROBLEM SYMPTOMS

Symptom Suspect Area See Section
Whole function does not operate
  1. IG power source circuit
  2. ACC power source circuit
  1. IG POWER SOURCE CIRCUIT 
  2. ACC POWER SOURCE CIRCUIT 
Air Flow Control : No blower operation
  1. IG power source circuit
  2. ACC power source circuit
  3. Blower motor circuit
  1. IG POWER SOURCE CIRCUIT 
  2. ACC POWER SOURCE CIRCUIT 
  3. BLOWER MOTOR CIRCUIT 
Air Flow Control : No blower control
  1. Blower motor circuit
  2. Room temp, sensor circuit
  3. Ambient temp, sensor circuit
  4. Solar sensor circuit (Driver Side)
  5. Solar sensor circuit (Passenger Side)
  1. BLOWER MOTOR CIRCUIT 
  2. DTC B1411/11 ROOM TEMPERATURE SENSOR CIRCUIT 
  3. DTC B1412/12 AMBIENT TEMPERATURE SENSOR CIRCUIT 
  4. DTC B1424/24 SOLAR SENSOR CIRCUIT (DRIVER SIDE) 
  5. DTC B1421/21 SOLAR SENSOR CIRCUIT (PASSENGER SIDE) 
Air Flow Control : Insufficient air flow
  1. Blower motor circuit
  1. BLOWER MOTOR CIRCUIT 
Temperature Control : No cool air comes out
  1. Blower motor circuit
  2. Pressure sensor circuit
  3. Air mix damper control servomotor circuit
  4. Room temp, sensor circuit
  5. Ambient temp, sensor circuit
  6. Evaporator temp, sensor circuit
  7. Compressor lock sensor circuit
  8. Solenoid of the externally changeable compressor circuit
  9. Back up power source circuit
  1. BLOWER MOTOR CIRCUIT 
  2. DTC B1423/23 PRESSURE SENSOR CIRCUIT 
  3. AIR MIX DAMPER CONTROL SERVOMOTOR CIRCUIT 
  4. DTC B1411/11 ROOM TEMPERATURE SENSOR CIRCUIT 
  5. DTC B1412/12 AMBIENT TEMPERATURE SENSOR CIRCUIT 
  6. DTC B1413/13 EVAPORATOR TEMPERATURE SENSOR CIRCUIT 
  7. DTC B1422/22 COMPRESSOR LOCK SENSOR CIRCUIT 
  8. DTC B1451/51 SOLENOID OF THE EXTERNALLY CHANGEABLE COMPRESSOR CIRCUIT 
  9. BACK UP POWER SOURCE CIRCUIT 
Temperature Control : No warm air comes out
  1. Air mix damper control servomotor circuit
  2. Water valve control servomotor circuit
  3. Room temp, sensor circuit
  4. Ambient temp, sensor circuit
  5. Evaporator temp, sensor circuit
  6. Compressor lock sensor circuit
  7. Solenoid of the externally changeable compressor circuit
  8. Pressure sensor circuit
  9. Back up power source circuit
  1. AIR MIX DAMPER CONTROL SERVOMOTOR CIRCUIT 
  2. WATER VALVE CONTROL SERVOMOTOR CIRCUIT 
  3. DTC B1411/11 ROOM TEMPERATURE SENSOR CIRCUIT 
  4. DTC B1412/12 AMBIENT TEMPERATURE SENSOR CIRCUIT 
  5. DTC B1413/13 EVAPORATOR TEMPERATURE SENSOR CIRCUIT 
  6. DTC B1422/22 COMPRESSOR LOCK SENSOR CIRCUIT 
  7. DTC B1451/51 SOLENOID OF THE EXTERNALLY CHANGEABLE COMPRESSOR CIRCUIT 
  8. DTC B1423/23 PRESSURE SENSOR CIRCUIT 
  9. BACK UP POWER SOURCE CIRCUIT 
Temperature Control : Output air is warmer or cooler than the set temperature or response is slow
  1. Air mix damper control servomotor circuit
  2. Water valve control servomotor circuit
  3. Cool air bypass damper control servomotor circuit (Driver side)
  4. Cool air bypass damper control servomotor circuit (Passenger side)
  5. Cool air bypass damper position sensor circuit (Driver side)
  6. Cool air bypass damper position sensor circuit (Passenger side)
  7. Room temp, sensor circuit
  8. Ambient temp, sensor circuit
  9. Evaporator temp, sensor circuit
  10. Air duct sensor circuit (Driver side)
  11. Air duct sensor circuit (Passenger Side)
  12. Solar sensor circuit (Driver side)
  13. Solar sensor circuit (Passenger side)
  1. AIR MIX DAMPER CONTROL SERVOMOTOR CIRCUIT 
  2. WATER VALVE CONTROL SERVOMOTOR CIRCUIT 
  3. COOL AIR BYPASS DAMPER CONTROL SERVOMOTOR CIRCUIT (DRIVER SIDE) 
  4. COOL AIR BYPASS DAMPER CONTROL SERVOMOTOR CIRCUIT (PASSENGER SIDE) 
  5. DTC B1434/34 COOL AIR BYPASS DAMPER POSITION SENSOR CIRCUIT (DRIVER SIDE) 
  6. DTC B1435/35 COOL AIR BYPASS DAMPER POSITION SENSOR CIRCUIT (PASSENGER SIDE) 
  7. DTC B1411/11 ROOM TEMPERATURE SENSOR CIRCUIT 
  8. DTC B1412/12 AMBIENT TEMPERATURE SENSOR CIRCUIT 
  9. DTC B1413/13 EVAPORATOR TEMPERATURE SENSOR CIRCUIT 
  10. DTC B1415/15 AIR DUCT SENSOR CIRCUIT (DRIVER SIDE) 
  11. DTC B1416/16 AIR DUCT SENSOR CIRCUIT (PASSENGER SIDE) 
  12. DTC B1424/24 SOLAR SENSOR CIRCUIT (DRIVER SIDE) 
  13. DTC B1421/21 SOLAR SENSOR CIRCUIT (PASSENGER SIDE) 
Temperature Control : No temperature control (only Max. cool or Max. warm)
  1. Air mix damper control servomotor circuit
  2. Room temp, sensor circuit
  3. Cool air bypass damper control servomotor circuit (Driver Side)
  4. Cool air bypass damper control servomotor circuit (Passenger Side)
  5. Evaporator temp, sensor circuit
  6. Solar sensor circuit (Driver side)
  7. Solar sensor circuit (Passenger side)
  1. AIR MIX DAMPER CONTROL SERVOMOTOR CIRCUIT 
  2. DTC B1411/11 ROOM TEMPERATURE SENSOR CIRCUIT 
  3. COOL AIR BYPASS DAMPER CONTROL SERVOMOTOR CIRCUIT (DRIVER SIDE) 
  4. COOL AIR BYPASS DAMPER CONTROL SERVOMOTOR CIRCUIT (PASSENGER SIDE) 
  5. DTC B1413/13 EVAPORATOR TEMPERATURE SENSOR CIRCUIT 
  6. DTC B1424/24 SOLAR SENSOR CIRCUIT (DRIVER SIDE) 
  7. DTC B1421/21 SOLAR SENSOR CIRCUIT (PASSENGER SIDE) 
No air inlet control
  1. Air inlet damper control servomotor circuit
  2. Air inlet damper position sensor circuit
  1. DTC B1442/42 AIR INLET DAMPER CONTROL SERVOMOTOR CIRCUIT 
  2. DTC B1432/32 AIR INLET DAMPER POSITION SENSOR CIRCUIT, DTC B1442/42 AIR INLET DAMPER POSITION SENSOR CIRCUIT 
No air flow mode control
  1. Air vent mode damper control servomotor circuit
  2. Back up power source circuit
  1. AIR VENT MODE DAMPER CONTROL SERVOMOTOR CIRCUIT 
  2. BACK UP POWER SOURCE CIRCUIT 
Blinking of A/C indicator
  1. Compressor lock sensor circuit
  2. Solenoid of the externally changeable compressor circuit
  1. DTC B1422/22 COMPRESSOR LOCK SENSOR CIRCUIT 
  2. DTC B1451/51 SOLENOID OF THE EXTERNALLY CHANGEABLE COMPRESSOR CIRCUIT 
Diagnostic trouble code not recorded.
Set mode is cleared when IG switch is turned OFF.
  1. Back up power source circuit
  1. BACK UP POWER SOURCE CIRCUIT 
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