AIR CONDITIONING SYSTEM (for Manual Air Conditioning System) PROBLEM SYMPTOMS TABLE
Tech Tips
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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.
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Inspect the fuses and relays related to this system before inspecting the suspected areas below.
| Symptom | Suspected Area | See page |
|---|---|---|
| All functions of the A/C system do not operate | Proceed to "IG Power Source Circuit" | |
| Proceed to "Back-up Power Source Circuit" | ||
| Proceed to "Air Conditioning Control Panel does not Operate" | ||
| Check air conditioning amplifier assembly | ||
| Check air conditioning control assembly | ||
| Proceed to "CAN Communication System" | ||
| Proceed to "LIN Communication System" | ||
| Air Flow Control: No blower operation | Proceed to "Blower Motor Circuit" | |
| Proceed to "Air Conditioning Control Panel does not Operate" | ||
| Check air conditioning amplifier assembly | ||
| Check air conditioning control assembly | ||
| Proceed to "LIN Communication System" | ||
| Air Flow Control: No blower control | Proceed to "Blower Motor Circuit" | |
| Proceed to "Air Conditioning Control Panel does not Operate" | ||
| Check air conditioning amplifier assembly | ||
| Check air conditioning control assembly | ||
| Proceed to "LIN Communication System" | ||
| Air Flow Control: Insufficient air flow | Proceed to "Blower Motor Circuit" | |
| Check air conditioning amplifier assembly | ||
| Temperature Control: No cool air comes out | Check volume of refrigerant | |
| Check for refrigerant gas leak | ||
| Replace cooler expansion valve | ||
| Proceed to "B1423/23" circuit | ||
| Proceed to "B1451/51" circuit | ||
| Proceed to "Air Conditioning Control Panel does not Operate" | ||
| Proceed to "B1441/41" circuit | ||
| Proceed to "B1412/12" circuit | ||
| Proceed to "B1413/13" circuit | ||
| Proceed to "B1497/97" circuit | ||
| Check air mix damper servo sub-assembly | ||
| Check air conditioning harness assembly | ||
| Check air conditioning amplifier assembly | ||
| Check air conditioning control assembly | ||
| Proceed to "CAN Communication System" | ||
| Proceed to "LIN Communication System" | ||
| Temperature Control: No warm air comes out | Proceed to "Air Conditioning Control Panel does not Operate" | |
| Proceed to "B1441/41" circuit | ||
| Proceed to "B1412/12" circuit | ||
| Proceed to "PTC Heater Circuit"* | ||
| Proceed to "Generator Signal Circuit"* | ||
| Proceed to "Headlight Signal Circuit"* | ||
| Proceed to "B1497/97" circuit | ||
| Check air mix damper servo sub-assembly | ||
| Check air conditioning harness assembly | ||
| Check air conditioning amplifier assembly | ||
| Check air conditioning control assembly | ||
| Proceed to "CAN Communication System" | ||
| Proceed to "LIN Communication System" | ||
| Temperature Control: No temperature control (only max cool or max warm) | Proceed to "B1451/51" circuit | |
| Proceed to "Air Conditioning Control Panel does not Operate" | ||
| Proceed to "B1441/41" circuit | ||
| Proceed to "B1412/12" circuit | ||
| Proceed to "B1413/13" circuit | ||
| Proceed to "PTC Heater Circuit"* | ||
| Proceed to "Generator Signal Circuit"* | ||
| Proceed to "Headlight Signal Circuit"* | ||
| Proceed to "B1497/97" circuit | ||
| Check air mix damper servo sub-assembly | ||
| Check air conditioning harness assembly | ||
| Check air conditioning amplifier assembly | ||
| Check air conditioning control assembly | ||
| Proceed to "CAN Communication System" | ||
| Proceed to "LIN Communication System" | ||
| No air inlet control | Proceed to "B1497/97" circuit | |
| Proceed to "B1442/42" circuit | ||
| Check air inlet damper servo sub-assembly | ||
| Check air conditioning harness assembly | ||
| Check air conditioning amplifier assembly | ||
| No air flow mode control | Proceed to "B1497/97" circuit | |
| Proceed to "B1443/43" circuit | ||
| Check air outlet damper servo sub-assembly | ||
| Check air conditioning harness assembly | ||
| Check air conditioning amplifier assembly | ||
| Engine idle up does not occur, or is continuous | Proceed to "B1451/51" circuit | |
| Proceed to "Air Conditioning Control Panel does not Operate" | ||
| Check air conditioning amplifier assembly | ||
| Check air conditioning control assembly | ||
| Check ECM (for 1ZR-FAE) | ||
| Check ECM (for 2ZR-FAE) | ||
| Check ECM (for 3ZR-FAE) | ||
| Proceed to "CAN Communication System" | ||
| Proceed to "LIN Communication System" | ||
| Blinking of air conditioning switch indicator | Proceed to "Air Conditioning Control Panel does not Operate" | |
| Check air conditioning amplifier assembly | ||
| Check air conditioning control assembly | ||
| Proceed to "LIN Communication System" | ||
| Diagnostic trouble codes are not stored, and set mode is cleared when ignition switch is off | Proceed to "Back-up Power Source Circuit" | |
| Check air conditioning amplifier assembly |
*: w/ PTC Heater