| Last Modified: 11-29-2007 | 1.6 T | |
| Service Category: Vehicle Interior | Section: Heating/Air Conditioning | |
| Model Year: 2008 | Model: Sequoia | Doc ID: RM000002VX7002X |
| Title: HEATING / AIR CONDITIONING: AIR CONDITIONING SYSTEM: PROBLEM SYMPTOMS TABLE (2008 Sequoia) | ||
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 (for Front)
|
Symptom |
Suspected Area |
See page |
|---|---|---|
|
No functions of integration control and panel operate |
LIN communication line |
|
|
Air conditioning control |
|
|
|
Air conditioning amplifier |
|
|
|
No functions of steering pad switch operate |
Steering pad switch |
|
|
Spiral cable |
|
|
|
Integration control and panel |
|
|
|
Wire harness or connector |
- |
|
|
No functions of air conditioning system operate |
ECU-IG No. 1 fuse |
|
|
Air conditioning control |
|
|
|
Air conditioning amplifier |
|
|
|
Wire harness or connector |
- |
|
|
Airflow Control: No blower control (blower motor does not operate) |
HTR fuse |
|
|
Blower motor circuit |
|
|
|
Air conditioning amplifier |
|
|
|
Air conditioning control |
|
|
|
Wire harness or connector |
- |
|
|
Airflow Control: No blower control (blower motor does not change speed) |
Blower motor circuit |
|
|
Air conditioning amplifier |
|
|
|
Air conditioning control |
|
|
|
Temperature Control: No cool air comes out |
Refrigerant volume |
|
|
Air conditioning pressure sensor circuit |
|
|
|
Air conditioning compressor magnetic clutch circuit |
|
|
|
Driver side air mix damper control servo motor circuit |
|
|
|
Passenger side air mix damper control servo motor circuit |
|
|
|
Evaporator temperature sensor circuit |
|
|
|
Room temperature sensor circuit |
|
|
|
Ambient temperature sensor circuit |
|
|
|
Expansion valve |
- |
|
|
Air conditioning amplifier |
|
|
|
Air conditioning control |
|
|
|
ECM (2UZ-FE) |
|
|
|
ECM (3UR-FE) |
|
|
|
LIN communication line |
|
|
|
CAN communication system |
|
|
|
Temperature Control: No warm air comes out |
Driver side air mix damper control servo motor circuit |
|
|
Passenger side air mix damper control servo motor circuit |
|
|
|
Air conditioning harness |
|
|
|
Room temperature sensor circuit |
|
|
|
Air conditioning amplifier |
|
|
|
Air conditioning control |
|
|
|
ECM (2UZ-FE) |
|
|
|
ECM (3UR-FE) |
|
|
|
LIN communication line |
|
|
|
CAN communication system |
|
|
|
Temperature Control: Output air is warmer or cooler |
Driver side solar sensor circuit |
|
|
Passenger side solar sensor circuit |
|
|
|
Room temperature sensor circuit |
|
|
|
Air inlet damper control servo motor circuit |
|
|
|
Heater radiator |
|
|
|
Expansion valve |
- |
|
|
Air conditioning amplifier |
|
|
|
Air conditioning control |
|
|
|
ECM (2UZ-FE) |
|
|
|
ECM (3UR-FE) |
|
|
|
LIN communication line |
|
|
|
CAN communication system |
|
|
|
Temperature Control: No temperature control (only Max. cool or Max. warm) |
Driver side solar sensor circuit |
|
|
Passenger side solar sensor circuit |
|
|
|
Air conditioning amplifier |
|
|
|
Air conditioning control |
|
|
|
LIN communication line |
|
|
|
No air inlet control |
Air conditioning control |
|
|
Air inlet damper control servo motor circuit |
|
|
|
Evaporator temperature sensor circuit |
|
|
|
Air conditioning amplifier |
|
|
|
No air flow mode control |
Air outlet damper control servo motor circuit |
|
|
Air conditioning amplifier |
|
|
|
Engine idle up does not occur, or is continuous |
Air conditioning compressor magnetic clutch circuit |
|
|
Air conditioning control |
|
|
|
LIN communication line |
|
|
|
Air conditioning amplifier |
|
|
|
ECM (2UZ-FE) |
|
|
|
ECM (3UR-FE) |
|
|
|
Blinking of A/C indicator |
Air conditioning compressor magnetic clutch circuit |
|
|
Air conditioning amplifier |
|
|
|
Cooling fan motor does not operate |
CDS FAN fuse |
|
|
CDS FAN relay |
|
|
|
Cooling fan motor |
|
|
|
Air conditioning amplifier |
|
|
|
Wire harness or connector |
- |
|
|
Diagnostic trouble codes are not recorded. Set mode is cleared when ignition switch turned off |
Air conditioning amplifier |
|
|
ECU power source circuit |
|
Air Conditioning System (for Rear)
|
Symptom |
Suspected Area |
See page |
|---|---|---|
|
No functions of rear A/C panel operate |
LIN communication line |
|
|
Rear air conditioning control |
|
|
|
Air conditioning amplifier |
|
|
|
No functions of rear A/C system operate |
ECU-IG No. 1 fuse |
|
|
Rear air conditioning control |
|
|
|
Air conditioning amplifier |
|
|
|
Wire harness or connector |
- |
|
|
Airflow Control: No blower control (blower motor does not operate) |
RR A/C fuse |
|
|
Rear blower motor circuit |
|
|
|
Air conditioning amplifier |
|
|
|
Rear air conditioning control |
|
|
|
Wire harness or connector |
- |
|
|
Airflow Control: No blower control (blower motor does not change speed) |
Rear blower motor circuit |
|
|
Air conditioning amplifier |
|
|
|
Rear air conditioning control |
|
|
|
Temperature Control: No cool air comes out |
Refrigerant volume |
|
|
Refrigerant pressure |
|
|
|
Air conditioning pressure sensor circuit |
|
|
|
Air conditioning compressor magnetic clutch circuit |
|
|
|
Rear air mix damper control servo motor circuit |
|
|
|
Rear evaporator temperature sensor circuit |
|
|
|
Rear room temperature sensor circuit |
|
|
|
Ambient temperature sensor circuit |
|
|
|
LIN communication line |
|
|
|
Rear air conditioning control |
|
|
|
Air conditioning amplifier |
|
|
|
Temperature Control: No warm air comes out |
Rear air mix damper control servo motor circuit |
|
|
Rear air conditioning harness |
|
|
|
Rear room temperature sensor circuit |
|
|
|
Air conditioning amplifier |
|
|
|
Rear air conditioning control |
|
|
|
LIN communication line |
|
|
|