NO.5 WINDSHIELD FOGGED [FULL-AUTO AIR CONDITIONER]

id0703c1801900

5
Windshield fogged
DESCRIPTION
•  A/C compressor does not operate while airflow mode is in DEFROSTER or DEF/HEAT modes.
•  Air intake mode does not change to FRESH while airflow mode is in DEFROSTER or DEF/HEAT modes.
POSSIBLE CAUSE
•  Climate control unit (B+ signal) system malfunction
•  Air intake actuator malfunction
•  Climate control unit (RECIRCULATE, FRESH signal) system malfunction
•  Blower unit air intake door malfunction

•  When performing an asterisked (*) troubleshooting inspection, shake the wiring harness and connectors while doing the inspection to discover whether poor contact points are the cause of any intermittent malfunctions. If there is a problem, inspect to make sure connectors, terminals and wiring harness are connected correctly and undamaged.

Diagnostic procedure

STEP

INSPECTION

ACTION
1
COOL AIR BLOW OUT INSPECTION
•  When both the A/C switch and airflow volume control switch in the climate control unit are on, does cool air blow out from the front vent?
Yes
Go to the next step.
No
Go to Step 1 of troubleshooting index No.7.
2
INSPECT CLIMATE CONTROL UNIT POWER SUPPLY FUSE FOR B+ SIGNAL
•  Is the climate control unit power supply fuse for B+ signal normal?
Yes
Go to the next step.
No
If the fuse is melted:
Repair or replace wiring harness for short to GND and replace the fuse.
If the fuse is deterioration:
Replace the fuse.
Then go to Step 14.
3
INSPECT AIR INTAKE ACTUATOR
•  Inspect the air intake actuator.
―  Is there grease on the link?
―  Is the link securely and properly positioned?
―  Is the link free of obstructions?
•  Are the above items normal?
Yes
Go to the next step.
No
Apply grease or install the link properly and securely, remove obstruction, then go to Step 14.
4*
INSPECT WIRING HARNESS BETWEEN FUSE BLOCK AND CLIMATE CONTROL UNIT FOR CONTINUITY
•  Disconnect the climate control unit connector (24-pin).
•  Switch the ignition ON (engine off or on).
•  Measure the voltage at climate control unit terminal 1A (B+ signal).
•  Is the voltage approx. 12 V?
Yes
Go to the next step.
No
Repair the wiring harness between the fuse block and climate control unit, then go to Step 14.
5*
INSPECT WIRING HARNESS BETWEEN CLIMATE CONTROL UNIT AND GROUND FOR VOLTAGE
•  Measure the voltage at climate control unit terminal 1U (Ground).
•  Is the voltage approx. 0V?
Yes
Go to the next step.
No
Repair the wiring harness between the climate control unit and ground, then go to Step 14.
6
VERIFY WHETHER MALFUNCTION IS IN A/C UNIT AIR INTAKE DOOR OR ELSEWHERE
•  Switch the ignition off.
•  Connect the climate control unit connector (24-pin and 12-pin).
•  Remove the air intake actuator.
•  Switch the ignition ON (engine off or on).
•  Set the airflow volume control switch to MAX position.
•  Does the air intake mode (RECIRCULATE, FRESH) change smoothly when the air intake link is operated by hand?
Yes
Go to the next step.
No
Go to Step 12.
7
INSPECT AIR INTAKE ACTUATOR
•  Inspect the air intake actuator. (See AIR INTAKE ACTUATOR INSPECTION [FULL-AUTO AIR CONDITIONER].)
•  Is it normal?
Yes
Go to the next step.
No
Replace the air intake actuator, go to Step 14.
8
INSPECT AIR INTAKE SELECTOR SWITCH AND DEFROSTER SWITCH IN CLIMATE CONTROL UNIT
•  Measure the voltage at climate control unit connector (12-pin) terminals 2J and 2L.
•  Is it normal?
Yes
Go to the next step.
No
Replace the climate control unit, then go to Step 14. (See CLIMATE CONTROL UNIT REMOVAL/INSTALLATION [FULL-AUTO AIR CONDITIONER].)
9*
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.
―  Terminal 2J —Terminal C (FRESH signal)
―  Terminal 2L —Terminal B (RECIRCULATE signal)
R.H.D.
―  Terminal 2J —Terminal B (FRESH signal)
―  Terminal 2L —Terminal C (RECIRCULATE signal)
Yes
Go to the next step.
No
Repair the wiring harness between the climate control unit and air intake actuator, then go to Step 14.
10*
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?
―  Terminal 2J (FRESH signal)
―  Terminal 2L (RECIRCULATE signal)
Yes
Repair the wiring harness between the climate control unit and air intake actuator, then go to Step 14.
No
Go to the next step.
11*
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.
―  Terminal 2J (FRESH signal)
―  Terminal 2L (RECIRCULATE signal)
•  Is the voltage approx. 12 V?
Yes
Repair the wiring harness between the climate control unit and air intake actuator, then go to Step 14.
No
Replace the climate control unit, then go to Step 14.
(See CLIMATE CONTROL UNIT REMOVAL/INSTALLATION [FULL-AUTO AIR CONDITIONER].)
12
INSPECT BLOWER UNIT AIR INTAKE DOOR
•  Is there any foreign material or obstruction in the blower unit air intake door?
Yes
Remove obstruction, then go to Step 14.
No
Go to the next step.
13
VERIFY THAT BLOWER UNIT AIR INTAKE DOOR IS POSITIONED SECURELY AND PROPERLY
•  Is the blower unit air intake door securely and properly positioned?
Yes
Inspect the air intake door for cracks or damage, then go to the next step.
No
Install the air intake door securely in the proper position, then go to the next step.
14
VERIFY THAT MALFUNCTION SYMPTOM OCCURS AFTER REPAIR
•  Does the malfunction disappear?
Yes
Troubleshooting completed.
Explain repairs to customer.
No
Recheck malfunction symptoms, then repeat from Step 1 if the malfunction recurs.