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*

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 short to GND in blown fuse circuit

Repair or replace as necessary.

Install appropriate amperage fuse.

2*

INSPECT TO SEE WHETHER MALFUNCTION (OPEN CIRCUIT) IS IN B+ SIGNAL WIRING HARNESS (BETWEEN FUSE BLOCK AND CLIMATE CONTROL UNIT) OR ELSEWHERE

• Disconnect the climate control unit connector.

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

• Measure the voltage at climate control unit harness-side connector terminal B (B+ signal).

• Is the voltage approx. 12V?

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.

• 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 the Step 20.

3*

INSPECT TO SEE WHETHER MALFUNCTION (LACK OF CONTINUITY) IS IN WIRING HARNESS (BETWEEN CLIMATE CONTROL UNIT AND GND) OR ELSEWHERE

• Climate control unit connector disconnected.

• Verify that continuity between climate control unit harness-side connector terminal A and GND.

• 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 A 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 the Step 20.

4*

INSPECT TO SEE WHETHER MALFUNCTION IS IN A/C UNIT OR AIRFLOW MODE ACTUATOR

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

• Measure voltage at climate control unit terminal J when airflow mode at VENT and DEFROSTER.

  (See CLIMATE CONTROL UNIT INSPECTION [MANUAL AIR CONDITIONER].)

• Is voltage normal?

Yes

Go to Step 16.

No

Go to the next step.

5*

INSPECT TO SEE WHETHER MALFUNCTION IS IN POSITION SENSOR OR ELSEWHERE

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

• Measure voltage at climate control unit terminal L when temperature setting to MAX HOT and MAX COLD.

  (See CLIMATE CONTROL UNIT INSPECTION [MANUAL AIR CONDITIONER].)

• Are voltages normal?

Yes

Go to Step 8.

No

Go to the next step.

6*

INSPECT TO SEE WHETHER MALFUNCTION (LACK OF CONTINUITY OR SHORT TO BATTERY POWER OR GND) IS IN POSITION SENSOR POWER SUPPLY (CLIMATE CONTROL UNIT TERMINAL G) OR ELSEWHERE

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

• Measure voltage at climate control unit terminal G.

• Is voltage approx. 5V?

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.

• 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 20.

7*

INSPECT TO SE WHETHER MALFUNCTION (LACK OF CONTINUITY OR OPEN) IS IN POSITION SENSOR GND (CLIMATE CONTROL UNIT TERMINAL A) OR ELSEWHERE

• Measure voltage at climate control unit terminal A.

• 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.

• 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 20.

8*

INSPECT TO SEE WHETHER MALFUNCTION (SHORT TO POWER) IS IN WIRING HARNESS (AIRFLOW MODE POSITION SIGNAL) OR ELSEWHERE

• Is climate control unit terminal J voltage approx. 12V, 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.

• 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 the Step 20.

No

Go to the next step.

9*

INSPECT TO SEE WHETHER MALFUNCTION (LACK OF CONTINUITY) IS IN WIRING HARNESS (AIRFLOW MODE POSITION SIGNAL) OR ELSEWHERE

• Switch the ignition off.

• Disconnect climate control unit and airflow mode actuator connectors

• Verify continuity between climate control unit terminal J and airflow mode actuator terminal C at harness-side connector.

• Is there continuity?

Yes

Go to 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.

• 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 20.

10*

INSPECT TO SEE WHETHER MALFUNCTION (SHORT TO GND) IS IN WIRING HARNESS (AIRFLOW MODE POSITION SIGNAL) OR POSITION SENSOR COMMON (POWER SUPPLY OR GND) HARNESS

• Verify continuity between climate control unit harness-side connector terminal J and GND.

• Is there continuity?

Yes

Repair wiring harness between climate control unit terminal J 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 GND).

Then go to Step 20.

11*

INSPECT TO SEE WHETHER MALFUNCTION (LACK OF CONTINUITY) IS IN AIRFLOW MODE ACTUATOR WIRING HARNESS (BETWEEN CLIMATE CONTROL UNIT AND AIRFLOW MODE ACTUATOR) OR ELSEWHERE

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

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

  (See CLIMATE CONTROL UNIT INSPECTION [MANUAL AIR CONDITIONER].)

• Terminal P (DEFROSTER mode motor drive signal)

• Terminal N (VENT mode motor drive signal)

• Are voltages okay?

Yes

Go to the next step.

No

Go to Step 13.

12*

INSPECT TO SEE WHETHER MALFUNCTION (LACK OF CONTINUITY) IS IN AIRFLOW MODE ACTUATOR OR WIRING HARNESS (BETWEEN CLIMATE CONTROL UNIT AND AIRFLOW MODE ACTUATOR)

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

• Climate control unit terminal P — airflow mode actuator terminal F (DEFROSTER mode motor drive signal)

• Climate control unit terminal N — airflow mode actuator terminal D (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.

• 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 20.

13*

INSPECT TO SEE WHETHER MALFUNCTION IS IN AIRFLOW MODE ACTUATOR OR ELSEWHERE

• Airflow mode actuator and climate control unit connectors disconnected.

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

  (See CLIMATE CONTROL UNIT INSPECTION [MANUAL AIR CONDITIONER].)

• Terminal P (DEFROSTER mode motor drive signal)

• Terminal N (VENT mode motor drive signal)

• Are voltage okay?

Yes

Go to Step 16.

No

Go to the next step.

14*

INSPECT TO SEE WHETHER MALFUNCTION IS IN WIRING HARNESS (SHORT TO B+ BETWEEN CLIMATE CONTROL UNIT AND AIRFLOW MODE ACTUATOR) OR ELSEWHERE

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

• Terminal P (DEFROSTER mode motor drive signal)

• Terminal N (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.

• 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 the Step 20.

15*

INSPECT TO SEE WHETHER MALFUNCTION IS IN WIRING HARNESS (SHORT TO GND BETWEEN CLIMATE CONTROL UNIT AND AIRFLOW MODE ACTUATOR) OR ELSEWHERE

• Switch the ignition off.

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

• Terminal P (DEFROSTER mode motor drive signal)

• Terminal N (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.

• 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 the Step 20.

No

Go to the next step.

16

INSPECT AIRFLOW MODE ACTUATOR

• Inspect airflow mode actuator.

  (See CLIMATE CONTROL UNIT INSPECTION [MANUAL 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 [MANUAL AIR CONDITIONER].)

Then go to the Step 20.

17

INSPECT AIRFLOW MODE LINK

• Inspect airflow mode links.

• Is grease on link?

• Are links securely and properly installed?

• Are links free of obstructions and hindrances?

• Are above items okay?

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 TO SEE WHETHER MALFUNCTION IS IN CLIMATE CONTROL UNIT OR AIRFLOW MODE DOOR

• Inspect A/C unit airflow mode door.

• Is door free of obstructions, cracks and damage?

• Are door securely and properly installed?

• Are above items okay?

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

VERIFY THAT DUCTS INSTALLATION CONDITION

• Are following ducts installed properly?

• Dashboard ducts

• Defroster ducts

Yes

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

No

Install the suspected ducts properly, then go to the next step.

20

CONFIRM THAT MALFUNCTION SYMPTOM DOES NOT RECUR AFTER REPAIR

• Does air blow out?

Yes

Troubleshooting completed.

Explain repairs to customer.

No

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