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

STEP

INSPECTION

ACTION

1

• 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 front vent?

Yes

Go to the next step.

No

Go to Step 1 of troubleshooting index No.7.

2

• 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 a short to ground and replace the fuse.

If the fuse is deterioration:

Replace the fuse.

Then go to Step 14.

3

• 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*

• Disconnect the climate control unit connector (24-pin).

• Switch the ignition ON (engine off or on).

• Measure the voltage at climate control unit terminal 1B (B+ signal).

• Is the voltage approx. 12 V?

Yes

Go to the next step.

No

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 14.

5*

• Measure the voltage at climate control unit terminal 1A (Ground).

• Is the voltage approx. 0 V?

Yes

Go to the next step.

No

Refer to the wiring diagram and verify whether or not there is a common connector between climate control unit terminal and ground.

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 14.

6

• 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 dial 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 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

• 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*

• Switch the ignition off.

• Is there continuity between the following climate control unit terminals and air intake actuator terminals?

• Terminal 2J —Terminal C (FRESH signal)

• Terminal 2L —Terminal B (RECIRCULATE signal)

Yes

Go to the next step.

No

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 14.

10*

• Is there continuity between the following climate control unit terminals and ground?

• Terminal 2J (FRESH signal)

• Terminal 2L (RECIRCULATE signal)

Yes

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 14.

No

Go to the next step.

11*

• 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

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 14.

No

Replace the climate control unit, then go to Step 14.

(See CLIMATE CONTROL UNIT REMOVAL/INSTALLATION [FULL-AUTO AIR CONDITIONER].)

12

• Is there any foreign matter or obstruction in the blower unit air intake door?

Yes

Remove obstruction, then go to Step 14.

No

Go to the next step.

13

• 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

• Does the malfunction disappear?

Yes

Troubleshooting completed.

Explain repairs to customer.

No

Recheck malfunction symptoms, then repeat from Step 1 if the malfunction recurs.