AC(diag)-39
Diagnostics with Phenomenon
HVAC SYSTEM (AUTO A/C) (DIAGNOSTICS)
9. Diagnostics with Phenomenon
A: INSPECTION
Symptom Problem parts
A/C system fails to operate.
•Fuse (M/B No. 15, F/B No. 7, 22, 31)
•Connector (Poor contact)
•Ground
•Auto A/C control module
•Blower fan motor
•Blower fan relay
•A/C relay
•Compressor (Magnet clutch)
•Evaporator sensor
Fuse is blown out.•Fuse (M/B No. 8, F/B No. 22, 31)
•Connector (Poor contact)
Illumination cannot dim.
•Fuse (M/B No. 8, F/B No. 22, 31)
•Connector (Poor contact)
•Illumination control switch
•Auto A/C control module
•Body integrated unit
Blower fan does not rotate or fan speed cannot be controlled.
•Fuse (F/B No. 22, 27, 28)
•Connector (Poor contact)
•Ground
•Auto A/C control module
•Blower fan motor
•Blower fan relay
•Power transistor or blower resistor
Unable to switch suction vents.
•Connector (Poor contact)
•Auto A/C control module
•Intake door actuator
Unable to switch blow vents.
•Connector (Poor contact)
•Auto A/C control module
•Mode door actuator
The compar tment temperature does not rise. (Warm air not
emitted.)
•Connector (Poor contact)
•Auto A/C control module
•Air mix door actuator
•In-vehicle sensor, ambient sensor, evaporator sensor and
sunload sensor
•In-vehicle sensor aspirator hose
•Aspirator body
The compar tment temperature does not lower. (Cold air not
emitted.)
•Connector (Poor contact)
•Auto A/C control module
•Air mix door actuator
•A/C relay
•Compressor (Magnet clutch)
•Radiator fan motor
•Radiator fan relay
•In-vehicle sensor, ambient sensor, evaporator sensor and
sunload sensor
•In-vehicle sensor aspirator hose
•Aspirator body
Compartment temperature is higher or lower than setting tem-
perature.
•Auto A/C control module
•Air mix door actuator
•In-vehicle sensor, ambient sensor, evaporator sensor and
sunload sensor
•In-vehicle sensor aspirator hose
•Aspirator body
AC(diag)-40
Diagnostics with Phenomenon
HVAC SYSTEM (AUTO A/C) (DIAGNOSTICS)
Compartment temperature does not quickly respond to setting
temperature.
•Air mix door actuator
•In-vehicle sensor, ambient sensor, evaporator sensor and
sunload sensor
•In-vehicle sensor aspirator hose
•Aspirator body
Radiator fan does not rotate during A/C operation.•Radiator fan motor
•Radiator fan relay
Seat heater does not run.
•Seat thermistor
•Seat heater relay
•Seat heater
•Auto A/C control module
•Front control panel
Symptom Problem parts
