2

Amount of air blown from vents does not change.

DESCRIPTION

• Malfunction in blower system

POSSIBLE CAUSE

• Blower unit malfunction

• Blower motor malfunction

• Malfunction in blower fan controller system

• Climate control unit malfunction

STEP

INSPECTION

ACTION

1

• Inspect the HEATER 40 A fuse.

• Is it normal?

Yes

Go to the next step.

No

If the fuse is melted:

Repair or replace wiring harness for short to ground and replace the fuse.

If the fuse is deterioration:

Replace the fuse.

Then go to Step 15.

2

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

• Turn the fan dial clockwise.

• Recirculate air inside the vehicle.

• Does the blower motor rotate smoothly?

Yes

Go to the next step.

No

Go to Step 4.

3

• Is blower unit intake vent restricted?

Yes

Remove obstruction, then go to Step 15.

No

Inspect if there are any obstruction in the A/C unit passage, then go to Step 15.

4*

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

• Turn the fan dial clockwise.

• Measure the voltage at the following blower motor terminal.

• Terminal A (blower motor operation signal)

• Is voltage approx. 12 V?

Yes

Go to Step 8.

No

Go to the next step.

5*

• Measure the voltage at the following blower relay terminals.

• Terminal A (B+ signal)

• Terminal B (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 blower relay terminal and HEATER 40 A fuse.

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 15.

6*

• Measure the voltage at the following blower relay terminal.

• Terminal D (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 blower relay terminal and front body control module (FBCM) 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 15.

7*

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

• Measure the voltage at the following blower relay terminal.

• Terminal C (blower motor operation signal)

• Is the voltage approx. 12 V?

Yes

Repair the wiring harness for lack of continuity between the blower relay and blower fan controller, then go to Step 15.

No

Replace the blower relay, then go to Step 15.

8*

• Measure the voltage at the following blower motor terminal.

• Terminal B (blower motor operation signal)

• Is the voltage approx. 12 V?

Yes

Go to the next step.

No

Inspect the blower motor, then go to Step 15.

(See BLOWER MOTOR INSPECTION [FULL-AUTO AIR CONDITIONER].)

9*

• Measure the voltage at the following terminal of blower fan controller.

• Terminal E (blower motor operation signal)

• Is 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 blower motor terminal and blower fan controller 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 15.

10*

• Measure the voltage at the following blower fan controller terminal.

• Terminal C (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 blower fan controller 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 15.

11

• Inspect the fan in blower unit.

• Is the fan free of interference with the blower unit case?

• Is the fan free of foreign matter and obstructions?

• Is the fan normal?

Yes

Go to the next step.

No

Remove obstruction, repair or replace the fan and blower unit case, then go to Step 15.

12*

• Disconnect blower fan controller connector.

• Turn the fun switch to 1st position from off.

• Measure the voltage at the following blower fan controller terminal.

• Terminal B (blower motor speed control signal)

• Is voltage approx. 7 V?

Yes

Replace the blower fan controller, then go to Step 15.

(See BLOWER FAN CONTROLLER REMOVAL/INSTALLATION [FULL-AUTO AIR CONDITIONER].)

No

Go to the next step.

13*

• Switch the ignition off.

• Disconnect climate control unit connector.

• Inspect for continuity at the following terminals between the blower fan controller and climate control unit.

• Terminal B—1E (blower motor speed control signal)

• 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 blower fan controller 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 15.

14*

• Inspect for continuity at the following terminal between the blower fan controller and ground.

• Terminal B (blower motor control signal)—ground

• Is there continuity?

Yes

Refer to the wiring diagram and verify whether or not there is a common connector between blower fan controller 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 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 next step.

No

Replace the climate control unit, then go to the next step.

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

15

• 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.