WINDSHIELD FOGGED [MANUAL AIR CONDITIONER]
id0703c2700700
DESCRIPTION
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• A/C compressor does not operate while airflow mode is in DEFROSTER or HEAT/DEF modes
• Air intake mode does not change to FRESH while airflow mode is in DEFROSTER or HEAT/DEF modes
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POSSIBLE CAUSE
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• A/C compressor malfunction
• ROOM 15 A fuse malfunction
• Air intake link malfunction
• Open or short circuit in wiring harness between climate control unit and air intake actuator
• Air intake actuator malfunction
• Climate control unit malfunction
• Blower unit malfunction
• Air intake door malfunction
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Diagnostic Procedure
Step |
Inspection |
Action |
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1
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COOL AIR BLOW OUT INSPECTION
• When both the A/C switch and airflow volume control dial in the climate control unit are on, does cool air blow out from the vent?
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Yes
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Go to the next step.
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No
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Go to Step 1 of the following troubleshooting.
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2
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INSPECT FUSE
• Remove the ROOM 15 A fuse.
• Is the fuse normal?
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Yes
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Go to the next step.
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No
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If the fuse is melted:
• Repair or replace wiring harness for a short to ground and replace the fuse.
If the fuse is deterioration:
• Replace the fuse.
Then go to Step 13.
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3
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INSPECT AIR INTAKE ACTUATOR LINK
• Inspect the air intake actuator link.
• Are the above items normal?
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Yes
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Go to the next step.
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No
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Apply grease or install the link properly and securely, remove obstruction, then go to Step 13.
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*4
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INSPECT WIRING HARNESS BETWEEN FUSE BLOCK AND CLIMATE CONTROL UNIT FOR CONTINUITY
• Disconnect the climate control unit connector.
• Switch the ignition ON (engine off or on).
• Measure the voltage at climate control unit terminal J (B+ signal).
• Is the voltage approx. 12 V?
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Yes
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Go to the next step.
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No
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Refer to the wiring diagram and verify whether or not there is a common connector between fuse block terminal and climate control unit terminal.
If there is a common connector:
• Determine the malfunctioning part by inspecting the common connector and the terminal for corrosion, damage, or pin disconnection, and the common wiring harness.
• Repair or replace the malfunctioning part.
If there is no common connector:
• Repair or replace the wiring harness.
Go to Step 13.
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5
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VERIFY WHETHER MALFUNCTION IS IN BLOWER UNIT AIR INTAKE DOOR OR ELSEWHERE
• Switch the ignition off.
• Connect the climate control unit connector.
• Remove the air intake actuator.
• Switch the ignition ON (engine off or on).
• Set the fan switch to on position.
• Does the air intake mode (RECIRCULATE, FRESH) change smoothly when the air intake link is operated by hand?
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Yes
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Go to the next step.
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No
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Go to Step 12.
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6
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INSPECT AIR INTAKE ACTUATOR
• Inspect the air intake actuator.
• Is it normal?
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Yes
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Go to the next step.
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No
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Replace the air intake actuator, go to Step 13.
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7
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INSPECT AIR INTAKE SELECTOR SWITCH AND DEFROSTER SWITCH IN CLIMATE CONTROL UNIT
• Measure the voltage at climate control unit connector terminals C and E.
• Is it normal?
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Yes
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Go to the next step.
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No
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Replace the climate control unit, then go to Step 13.
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*8
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INSPECT WIRING HARNESS BETWEEN CLIMATE CONTROL UNIT AND AIR INTAKE ACTUATOR FOR CONTINUITY
• Switch the ignition off.
• Is there continuity between the following climate control unit terminals and air intake actuator terminals?
L.H.D.
R.H.D.
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Yes
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Go to the next step.
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No
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Refer to the wiring diagram and verify whether or not there is a common connector between climate control unit terminal and air intake actuator terminal.
If there is a common connector:
• Determine the malfunctioning part by inspecting the common connector and the terminal for corrosion, damage, or pin disconnection, and the common wiring harness for an open circuit.
• Repair or replace the malfunctioning part.
If there is no common connector:
• Repair or replace the wiring harness which has an open circuit.
Go to Step 13.
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*9
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INSPECT WIRING HARNESS BETWEEN CLIMATE CONTROL UNIT AND AIR INTAKE ACTUATOR FOR SHORT TO GROUND
• Is there continuity between the following climate control unit terminals and ground?
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Yes
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Refer to the wiring diagram and verify whether or not there is a common connector between climate control unit terminal and air intake actuator terminal.
If there is a common connector:
• Determine the malfunctioning part by inspecting the common connector and the terminal for corrosion, damage, or pin disconnection, and the common wiring harness for a short to ground.
• Repair or replace the malfunctioning part.
If there is no common connector:
• Repair or replace the wiring harness which has a short to ground.
Go to Step 13.
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No
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Go to the next step.
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*10
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INSPECT WIRING HARNESS BETWEEN CLIMATE CONTROL UNIT AND AIR INTAKE ACTUATOR FOR SHORT TO B+
• Switch the ignition ON (engine off or on).
• Measure the voltage at the following climate control unit terminals.
• Is the voltage approx. 12 V?
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Yes
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Refer to the wiring diagram and verify whether or not there is a common connector between climate control unit terminal and air intake actuator terminal.
If there is a common connector:
• Determine the malfunctioning part by inspecting the common connector and the terminal for corrosion, damage, or pin disconnection, and the common wiring harness for a short to power supply.
• Repair or replace the malfunctioning part.
If there is no common connector:
• Repair or replace the wiring harness which has a short to power supply.
Go to Step 13.
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No
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Replace the climate control unit, then go to Step 13.
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11
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INSPECT BLOWER UNIT AIR INTAKE DOOR
• Is there any foreign matter or obstruction in the blower unit air intake door?
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Yes
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Remove obstruction, then go to Step 13.
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No
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Go to the next step.
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12
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VERIFY THAT BLOWER UNIT AIR INTAKE DOOR IS POSITIONED SECURELY AND PROPERLY
• Is the blower unit air intake door securely and properly positioned?
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Yes
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Go to the next step.
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No
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Install the air intake door securely in the proper position, then go to the next step.
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13
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VERIFY THAT MALFUNCTION SYMPTOM OCCURS AFTER REPAIR
• Does the malfunction disappear?
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Yes
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Troubleshooting completed.
Explain repairs to customer.
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No
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Recheck malfunction symptoms, then repeat from Step 1 if the malfunction recurs.
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