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
•  A/C 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 and fan 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 melt:
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 (16-pin).
•  Switch the ignition to ON.
•  Measure the voltage at climate control unit terminal 2B (B+ signal).
•  Is the voltage approx. 12 V?
Yes
Go to the next step.
No
Repair the wiring harness for open 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 1D (Ground).
•  Is the voltage approx. 0V?
Yes
Go to the next step.
No
Repair the wiring harness for open 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 to off.
•  Connect the climate control unit connector (24-pin and 16-pin).
•  Remove the air intake actuator.
•  Switch the ignition to ON.
•  Set the fan 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.
•  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 (24-pin) terminals 1R and 1T.
•  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
•  Disconnect climate control unit (16-pin) and air intake actuator connectors
•  Switch the ignition off.
•  Is there continuity between the following climate control unit terminals and air intake actuator terminals?
L.H.D.
―  Terminal 1R —Terminal C (FRESH signal)
―  Terminal 1T —Terminal B (RECIRCULATE signal)
R.H.D.
―  Terminal 1R —Terminal B (FRESH signal)
―  Terminal 1T —Terminal C (RECIRCULATE signal)
Yes
Go to the next step.
No
Repair the wiring harness for open 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
•  Climate control unit (16-pin) and air intake actuator connectors disconnected.
•  Is there continuity between the following climate control unit terminals and ground?
―  Terminal 1R (FRESH signal)
―  Terminal 1T (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+
•  Climate control unit (16-pin) and air intake actuator connectors disconnected.
•  Switch the ignition to ON.
•  Measure the voltage at the following climate control unit terminals.
―  Terminal 1R (FRESH signal)
―  Terminal 1T (RECIRCULATE signal)
•  Is the voltage approx. 12 V?
Yes
Repair the wiring harness for short to B+ 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 A/C UNIT AIR INTAKE DOOR
•  Is there any foreign material or obstruction in the A/C unit air intake door?
Yes
Remove obstruction, then go to Step 14.
No
Go to the next step.
13
VERIFY THAT A/C UNIT AIR INTAKE DOOR IS POSITIONED SECURELY AND PROPERLY
•  Is the A/C 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.