NO.5 WINDSHIELD FOGGED [MANUAL AIR CONDITIONER]

id0703c2801900

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 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.8.
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
Inspect for a short to ground on blown fuse circuit.
•  Repair or replace if necessary. Install appropriate amperage fuse.
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.
•  Switch the ignition ON (engine off or on).
•  Measure the voltage at climate control unit terminal B (B+ signal).
•  Is the voltage approx. 12 V?
Yes
Go to the next step.
No
If there is a common connector:If there is no common connector:
Refer to the wiring diagram and verify whether or not there is a common connector between fuse block terminal and climate control unit terminal.
•  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.
•  Repair or replace the wiring harness.
Go to Step 14.
*5
INSPECT WIRING HARNESS BETWEEN CLIMATE CONTROL UNIT AND GROUND FOR VOLTAGE
•  Measure the voltage at climate control unit terminal A (Ground).
•  Is the voltage approx. 0V?
Yes
Go to the next step.
No
If there is a common connector:If there is no common connector:
Refer to the wiring diagram and verify whether or not there is a common connector between climate control unit terminal and ground.
•  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.
•  Repair or replace the wiring harness.
Go to Step 14.
6
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?
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 terminals R and T.
•  Is it normal?
Yes
Go to the next step.
No
Replace the climate control unit, then go to Step 14.
*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 C —Terminal R (FRESH signal)
―  Terminal B —Terminal T (RECIRCULATE signal)
R.H.D.
―  Terminal B —Terminal R (FRESH signal)
―  Terminal C —Terminal T (RECIRCULATE signal)
Yes
Go to the next step.
No
If there is a common connector:If there is no common connector:
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.
•  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.
•  Repair or replace the wiring harness which has an open circuit.
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 R (FRESH signal)
―  Terminal T (RECIRCULATE signal)
Yes
If there is a common connector:If there is no common connector:
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.
•  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.
•  Repair or replace the wiring harness which has a short to ground.
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 POWER SUPPLY
•  Switch the ignition ON (engine off or on).
•  Measure the voltage at the following climate control unit terminals.
―  Terminal R (FRESH signal)
―  Terminal T (RECIRCULATE signal)
•  Is the voltage approx. 12 V?
Yes
If there is a common connector:If there is no common connector:
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.
•  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.
•  Repair or replace the wiring harness which has a short to power supply.
Go to Step 14.
No
Replace the climate control unit, then go to Step 14.
(See CLIMATE CONTROL UNIT REMOVAL/INSTALLATION [MANUAL 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.