| Last Modified: 11-27-2007 | 1.6 T | |
| Service Category: Vehicle Interior | Section: Heating/Air Conditioning | |
| Model Year: 2008 | Model: LX570 | Doc ID: RM000002LIQ005X |
| Title: HEATING / AIR CONDITIONING: AIR CONDITIONING SYSTEM: PROBLEM SYMPTOMS TABLE (2008 LX570) | ||
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.
Front Air Conditioning Unit
|
Symptom |
Suspected Area |
See page |
|---|---|---|
|
All functions of air conditioning system do not operate |
Harness or connector |
- |
|
IG power source circuit |
|
|
|
Back-up power source circuit |
|
|
|
Display and navigation module display*1 |
|
|
|
Multi-display*2 |
|
|
|
Air conditioning amplifier assembly |
|
|
|
Air Flow Control: No blower operation |
Harness or connector |
- |
|
Blower motor circuit |
|
|
|
Air conditioning amplifier assembly |
|
|
|
Air Flow Control: Insufficient air flow |
Blower motor circuit |
|
|
Air conditioning amplifier assembly |
|
|
|
Temperature Control: No cool air comes out |
Volume of refrigerant |
|
|
Refrigerant pressure |
|
|
|
Cooler compressor assembly |
|
|
|
Pressure sensor circuit |
|
|
|
Front air mix damper servo motor (for driver side) |
|
|
|
Front air mix damper servo motor (for driver side rear air flow) |
|
|
|
Front air mix damper servo motor (for front passenger side) |
|
|
|
Front air mix damper servo motor (for front passenger side rear air flow) |
|
|
|
Room temperature sensor circuit |
|
|
|
Rear room temperature sensor LH circuit |
|
|
|
Rear room temperature sensor RH circuit |
|
|
|
Solar sensor circuit (for driver side) |
|
|
|
Solar sensor circuit (for front passenger side) |
|
|
|
Ambient temperature sensor circuit |
|
|
|
Evaporator temperature sensor circuit |
|
|
|
Air conditioning harness assembly |
|
|
|
Air conditioning amplifier assembly |
|
|
|
CAN communication line |
|
|
|
Temperature Control: No warm air comes out |
Front air mix damper servo motor (for driver side) |
|
|
Front air mix damper servo motor (for driver side rear air flow) |
|
|
|
Front air mix damper servo motor (for front passenger side) |
|
|
|
Front air mix damper servo motor (for front passenger side rear air flow) |
|
|
|
Room temperature sensor circuit |
|
|
|
Rear room temperature sensor LH circuit |
|
|
|
Rear room temperature sensor RH circuit |
|
|
|
Solar sensor circuit (for driver side) |
|
|
|
Solar sensor circuit (for front passenger side) |
|
|
|
Ambient temperature sensor circuit |
|
|
|
Air conditioning harness assembly |
|
|
|
Air conditioning amplifier assembly |
|
|
|
CAN communication line |
|
|
|
Temperature Control: Output air is warmer or cooler than the set temperature or response is slow |
Volume of refrigerant |
|
|
Refrigerant pressure |
|
|
|
Front air mix damper servo motor (for driver side) |
|
|
|
Front air mix damper servo motor (for driver side rear air flow) |
|
|
|
Front air mix damper servo motor (for front passenger side) |
|
|
|
Front air mix damper servo motor (for front passenger side rear air flow) |
|
|
|
REC/FRS damper servo motor |
|
|
|
Cool air bypass damper servo motor |
|
|
|
Room temperature sensor circuit |
|
|
|
Rear room temperature sensor LH circuit |
|
|
|
Rear room temperature sensor RH circuit |
|
|
|
Solar sensor circuit (for driver side) |
|
|
|
Solar sensor circuit (for front passenger side) |
|
|
|
Ambient temperature sensor circuit |
|
|
|
Cooler compressor assembly |
|
|
|
Heater radiator |
- |
|
|
Air conditioning harness assembly |
|
|
|
Air conditioning amplifier assembly |
|
|
|
CAN communication line |
|
|
|
Temperature Control: No temperature control (only max cool or max hot) |
Room temperature sensor circuit |
|
|
Rear room temperature sensor LH circuit |
|
|
|
Rear room temperature sensor RH circuit |
|
|
|
Ambient temperature sensor circuit |
|
|
|
Cool air bypass damper servo motor |
|
|
|
Front air mix damper servo motor (for driver side) |
|
|
|
Front air mix damper servo motor (for driver side rear air flow) |
|
|
|
Front air mix damper servo motor (for front passenger side) |
|
|
|
Front air mix damper servo motor (for front passenger side rear air flow) |
|
|
|
Display and navigation module display*1 |
|
|
|
Multi-display*2 |
|
|
|
Air conditioning harness assembly |
|
|
|
Air conditioning amplifier assembly |
|
|
|
CAN communication line |
|
|
|
PTC heater does not operate*3 |
PTC heater circuit |
|
|
Air conditioning amplifier assembly |
|
|
|
No airflow mode control |
Air outlet damper servo motor (for driver side mode) |
|
|
Air outlet damper servo motor (for rear seat mode) |
|
|
|
Air outlet damper servo motor (for front passenger side mode) |
|
|
|
Air conditioning harness assembly |
|
|
|
Air conditioning amplifier assembly |
|
|
|
Blinking of air conditioning switch indicator |
Display and navigation module display*1 |
|
|
Multi-display*2 |
|
|
|
Air conditioning amplifier assembly |
|
|
|
CAN communication line |
|
|
|
Diagnostic trouble codes are not stored. Set mode is cleared when engine switch is turned off. |
Back-up power source circuit |
|
|
Air conditioning amplifier assembly |
|
Rear Air Conditioning Unit
|
Symptom |
Suspected Area |
See page |
|---|---|---|
|
All functions of air conditioning system do not operate |
Harness or connector |
- |
|
IG power source circuit |
|
|
|
Back-up power source circuit |
|
|
|
No. 2 air conditioning control assembly |
|
|
|
Air conditioning amplifier assembly |
|
|
|
Air Flow Control: No blower operation |
Rear blower motor circuit |
|
|
Air conditioning amplifier assembly |
|
|
|
Air Flow Control: Insufficient air flow |
Rear blower motor circuit |
|
|
Air conditioning amplifier assembly |
|
|
|
Temperature Control: No cool air comes out |
Volume of refrigerant |
|
|
Refrigerant pressure |
|
|
|
Cooler compressor assembly |
|
|
|
Pressure sensor circuit |
|
|
|
Rear air mix damper servo motor LH |
|
|
|
Rear air mix damper servo motor RH |
|
|
|
Rear room temperature sensor LH circuit |
|
|
|
Rear room temperature sensor RH circuit |
|
|
|
Ambient temperature sensor circuit |
|
|
|
Evaporator temperature sensor circuit |
|
|
|
Rear evaporator temperature sensor circuit |
|
|
|
Rear magnetic valve circuit |
|
|
|
No. 2 air conditioning harness assembly |
- |
|
|
Air conditioning amplifier assembly |
|
|
|
CAN communication line |
|
|
|
Temperature Control: No warm air comes out |
Rear air mix damper servo motor LH |
|
|
Rear air mix damper servo motor RH |
|
|
|
Rear room temperature sensor LH circuit |
|
|
|
Rear room temperature sensor RH circuit |
|
|
|
Ambient temperature sensor circuit |
|
|
|
No. 2 air conditioning harness assembly |
- |
|
|
Duct sensor LH circuit |
|
|
|
Duct sensor RH circuit |
|
|
|
Air conditioning amplifier assembly |
|
|
|
CAN communication line |
|
Cooling Box
|
Symptom |
Suspected Area |
See page |
|---|---|---|
|
Cool box malfunction*4 |
Cooling box magnetic valve circuit |
|
|
Cooling box blower motor circuit |
|
|
|
Cooling box control switch circuit |
|
|
|
Cooling box sensor circuit |
|
|
|
Air conditioning amplifier assembly (for cool box) |
- |
|
|
No. 1 cooler wiring harness sub-assembly |
- |
|
|
Noise filter (built into cooling box unit) |
- |
|
|
Fuse (built into cooling box unit) |
- |
*1: w/ Navigation System
*2: w/o Navigation System
*3: w/ PTC Heater
*4: w/ Cool Box
|
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