1

Insufficient air (or no air) blown from vents

DESCRIPTION

• Problem with each vent and/or duct

• Airflow mode does not change

POSSIBLE CAUSE

• Malfunction in airflow mode actuator

• Malfunction in VENT mode system

• Malfunction in HEAT mode system

• Malfunction in DEFROSTER mode system

STEP

INSPECTION

ACTION

1*

• 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 in blown fuse circuit

Repair or replace if necessary.

Install appropriate amperage fuse.

2*

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

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

• Measure the voltage at climate control unit harness-side connector (24-pin) 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 climate control unit terminal and fuse block 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 the Step 20.

3*

• Climate control unit connector (24-pin) disconnected.

• Verify continuity between climate control unit harness-side connector (24-pin) terminal 1A and ground.

• Is there continuity?

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 1A 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 the Step 20.

4*

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

• Measure voltage at climate control unit terminal 2A (24-pin) when airflow mode at VENT and DEFROSTER.

  (See CLIMATE CONTROL UNIT INSPECTION [FULL-AUTO AIR CONDITIONER].)

• Is voltage normal?

Yes

Go to Step 16.

No

Go to the next step.

5*

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

• Measure voltage at climate control unit terminal 2G and 2E (24-pin) when temperature setting to MAX HOT and MAX COLD.

  (See CLIMATE CONTROL UNIT INSPECTION [FULL-AUTO AIR CONDITIONER].)

• Is voltage normal?

Yes

Go to Step 8.

No

Go to the next step.

6*

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

• Measure voltage at climate control unit terminal 1N (24-pin).

• Is voltage approx. 5 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 airflow mode actuator / air mix 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.

• Repair or replace the malfunctioning part.

If there is no common connector:

• Repair or replace the wiring harness.

Go to Step 20.

7*

• Measure voltage at climate control unit terminal 1J (24-pin).

• Is voltage below 1.0 V?

Yes

Go to Step 11.

No

Refer to the wiring diagram and verify whether or not there is a common connector between climate control unit terminal and airflow mode actuator / air mix 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.

• Repair or replace the malfunctioning part.

If there is no common connector:

• Repair or replace the wiring harness.

Go to Step 20.

8*

• Is climate control unit terminal 2A voltage approx. 12 V, at Step 4?

Yes

Refer to the wiring diagram and verify whether or not there is a common connector between climate control unit terminal and airflow mode 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 the Step 20.

No

Go to the next step.

9*

• Switch the ignition off.

• Disconnect climate control unit and airflow mode actuator connectors.

• Verify continuity between climate control unit terminal 1R (24-pin) and airflow mode actuator terminal C at harness-side connector.

• Is there continuity?

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 airflow mode 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.

• Repair or replace the malfunctioning part.

If there is no common connector:

• Repair or replace the wiring harness.

Go to Step 20.

10*

• Verify continuity between climate control unit harness-side connector terminal 2A (24-pin) and ground.

• Is there continuity?

Yes

Repair wiring harness between climate control unit terminal 2A and airflow mode actuator terminal C.

Then go to Step 20.

No

Inspection and repair for open circuit following:

• Between airflow mode actuator terminal B and junction point to each air mix actuator (position sensor power supply).

• Between airflow mode actuator terminal A and junction point to each air mix actuator (position sensor ground).

Then go to Step 20.

11*

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

• Measure voltage at the following terminals of climate control unit.

  (See CLIMATE CONTROL UNIT INSPECTION [FULL-AUTO AIR CONDITIONER].)

• Terminal 2K (12-pin, DEFROSTER mode motor drive signal)

• Terminal 2I (12-pin, VENT mode motor drive signal)

• Is voltage normal?

Yes

Go to the next step.

No

Go to Step 13.

12*

• Verify continuity at following terminals between airflow mode actuator and climate control unit.

• Climate control unit terminal 2K — airflow mode actuator terminal F (12-pin, DEFROSTER mode motor drive signal)

• Climate control unit terminal 2I — airflow mode actuator terminal D (12-pin, VENT mode motor drive signal)

• Is there continuity?

Yes

Go to Step 17.

No

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

• Repair or replace the malfunctioning part.

If there is no common connector:

• Repair or replace the wiring harness.

Go to Step 20.

13*

• Airflow mode actuator and climate control unit connectors disconnected.

• Measure voltage at the following terminals of climate control unit.

  (See CLIMATE CONTROL UNIT INSPECTION [FULL-AUTO AIR CONDITIONER].)

• Terminal 2K (12-pin, DEFROSTER mode motor drive signal)

• Terminal 2I (12-pin, VENT mode motor drive signal)

• Is voltage normal?

Yes

Go to Step 16.

No

Go to the next step.

14*

• Measure voltage at the following terminal of the climate control unit harness-side connector.

• Terminal 2K (12-pin, DEFROSTER mode motor drive signal)

• Terminal 2I (12-pin, VENT mode motor drive signal)

• Are voltages 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 airflow mode 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 the Step 20.

15*

• Switch the ignition off.

• Verify that continuity at the following harness-side connector terminals between climate control unit and ground.

• Terminal 2K (12-pin, DEFROSTER mode motor drive signal)

• Terminal 2I (12-pin, VENT mode motor drive signal)

• Is there continuity?

Yes

Refer to the wiring diagram and verify whether or not there is a common connector between climate control unit terminal and airflow mode 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 the Step 20.

No

Go to the next step.

16

• Inspect airflow mode actuator.

  (See AIRFLOW MODE ACTUATOR INSPECTION [FULL-AUTO AIR CONDITIONER].)

• Is airflow mode actuator normal?

Yes

Go to the next step.

No

Replace the airflow mode actuator. (See AIRFLOW MODE ACTUATOR REMOVAL/INSTALLATION [FULL-AUTO AIR CONDITIONER].)

Then go to the Step 20.

17

• Inspect airflow mode links.

• Is grease on link?

• Are links securely and properly installed?

• Are links free of obstructions and hindrances?

• Are the above items normal?

Yes

Go to the next step.

No

Apply grease to links.

If any links are damaged, replace malfunctioning part.

Then go to the Step 20.

18

• Inspect A/C unit airflow mode door.

• Is door free of obstructions, cracks and damage?

• Are door securely and properly installed?

• Are the above items normal?

Yes

Go to the next step.

No

Remove the obstruction, or install door in proper position.

If any doors are cracked or damaged, replace them.

Then go to the Step 20.

19

• Are the following ducts installed properly?

• Dashboard ducts

• Defroster ducts

Yes

Inspect ducts for restriction, deformity, and air leakage, then go to the next step.

No

Install the incorrectly installed ducts properly, then go to the next step.

20

• Is air discharged from vent?

Yes

Troubleshooting completed.

Explain repairs to customer.

No

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