INSUFFICIENT AIR (OR NO AIR) BLOWN FROM FRONT VENTS [FULL-AUTO AIR CONDITIONER]

id0703c1006000

DESCRIPTION

•  Insufficient airflow from vent or duct

•  No airflow from vent or duct

•  Front airflow mode does not change

POSSIBLE CAUSE

•  Blower system malfunction

•  ROOM 15 A fuse malfunction

•  Open circuit in wiring harness between battery positive terminal and front climate control unit terminal 1U

•  Short to ground in wiring harness between front climate control unit terminal 1U and ROOM 15 A fuse

•  Front airflow mode actuator connector or terminal malfunction

•  Front climate control unit connector or terminal malfunction

•  Front airflow mode actuator malfunction

•  Front climate control unit malfunction

•  Open circuit or short to ground or short to power supply in wiring harness between the following terminals:

―  Front climate control unit terminal 1C — front airflow mode actuator terminal C

―  Front climate control unit terminal 1B — front airflow mode actuator terminal B

―  Front climate control unit terminal 1Q — front airflow mode actuator terminal A

―  Front climate control unit terminal 2D — front airflow mode actuator terminal D

―  Front climate control unit terminal 2B — front airflow mode actuator terminal E

•  Short to ground or short to power supply in wiring harness between the following terminals:

―  Front climate control unit terminal 1C — driver-side front air mix actuator terminal C

―  Front climate control unit terminal 1Q — driver-side front air mix actuator terminal A

―  Front climate control unit terminal 1C — passenger-side front air mix actuator terminal A

―  Front climate control unit terminal 1Q — passenger-side front air mix actuator terminal C

•  Short to ground or short to power supply in wiring harness between the following terminals:

―  Front climate control unit terminal 1C — air intake actuator terminal C

―  Front climate control unit terminal 1Q — air intake actuator terminal A

•  Short to ground or short to power supply in wiring harness between the following terminals:

―  Front climate control unit terminal 1C — solar radiation sensor terminal A

•  Short to power supply in wiring harness between the following terminals:

―  Front climate control unit terminal 1Q — cabin temperature sensor terminal B

•  Short to power supply in wiring harness between the following terminals:

―  Front climate control unit terminal 1Q — evaporator temperature sensor terminal A

•  Front airflow mode link malfunction

―  Lack of grease

―  Bad installation

•  Front airflow mode door malfunction

―  Bad installation

―  Damage

•  Vent is closed

•  Vent is clogged

•  Duct malfunction

―  Deformation

―  Clogging

―  Air leakage

―  Bad installation

Diagnostic Procedure

Step

Inspection

Action

1

PERFORM CLIMATE CONTROL UNIT DTC INSPECTION

•  Perform the climate control unit DTC inspection using the M-MDS.
(See DTC DISPLAY [CLIMATE CONTROL UNIT (FULL-AUTO AIR CONDITIONER)].)

•  Are any DTCs displayed?

Yes

Go to the applicable DTC inspection.

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

No

Go to the next step.

2

VERIFY FRONT BLOWER MOTOR OPERATION

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

•  Set the airflow volume control dial to 1 or more.

•  Does air flow from the vent after operating the front blower motor?

Yes

Go to the next step.

No

Go to the following malfunction symptom item.

(See AMOUNT OF AIR BLOWN FROM FRONT VENTS DOES NOT CHANGE [FULL-AUTO AIR CONDITIONER].)

3

VERIFY AIRFLOW CONDITION

•  Does air flow from the vent when the airflow mode is in the VENT mode?

Yes

Go to Step 7.

No

Go to the next step.

4

VERIFY VENT CONDITION

•  Is the air vent (right and left/center) closed?

Yes

Open the air vent, then go to Step 13.

No

Go to the next step.

5

INSPECT AIR VENT FOR CLOGGING

•  Is the air vent clogged?

Yes

Remove the obstruction, then go to Step 13.

No

Go to the next step.

6

VERIFY DUCT INSTALLATION CONDITION

•  Is the duct (installed to dashboard) installed to the position correctly and securely?
(See DASHBOARD REMOVAL/INSTALLATION.)

Yes

Inspect ducts for restriction, deformity, and air leakage, then go to Step 13.

No

Install the incorrectly installed ducts properly, then go to Step 13.

(See DASHBOARD DISASSEMBLY/ASSEMBLY.)

7

VERIFY AIRFLOW CONDITION

•  Does air flow from the vent when the airflow mode is in the HEAT mode?

Yes

Go to Step 10.

No

Go to the next step.

8

INSPECT AIR VENT FOR CLOGGING

•  Is the air vent clogged?

Yes

Remove the obstruction, then go to Step 13.

No

Go to the next step.

9

VERIFY DUCT INSTALLATION CONDITION

•  Is the duct installed to the position correctly and securely?
(See FRONT HEAT DUCT REMOVAL/INSTALLATION)

(See REAR HEAT DUCT No.1 REMOVAL/INSTALLATION.)

Yes

Inspect ducts for restriction, deformity, and air leakage, then go to Step 13.

No

Install the incorrectly installed ducts properly, then go to Step 13.

(See FRONT HEAT DUCT REMOVAL/INSTALLATION.)

(See REAR HEAT DUCT No.1 REMOVAL/INSTALLATION.)

10

VERIFY AIRFLOW CONDITION

•  Does air flow from the vent when the airflow mode is in the DEFROSTER mode?

Yes

Go to Step 13.

No

Go to the next step.

11

INSPECT AIR VENT FOR CLOGGING

•  Is the air vent clogged?

Yes

Remove the obstruction, then go to Step 13.

No

Go to the next step.

12

VERIFY DUCT INSTALLATION CONDITION

•  Is the defroster duct installed to the position correctly and securely?
(See DASHBOARD REMOVAL/INSTALLATION.)

•  Are the defroster ducts installed properly?
(See DASHBOARD REMOVAL/INSTALLATION.)

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.

(See DASHBOARD DISASSEMBLY/ASSEMBLY.)

13

VERIFY THAT MALFUNCTION SYMPTOM DOES NOT RECUR AFTER REPAIR

•  Is air discharged from vent?

•  Does air flow from the vent while in each airflow mode?

Yes

Troubleshooting completed.

Explain repairs to customer.

No

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

Step	Inspection		Action
1	PERFORM CLIMATE CONTROL UNIT DTC INSPECTION • Perform the climate control unit DTC inspection using the M-MDS. (See DTC DISPLAY [CLIMATE CONTROL UNIT (FULL-AUTO AIR CONDITIONER)].) • Are any DTCs displayed?	Yes	Go to the applicable DTC inspection. (See DTC TABLE [CLIMATE CONTROL UNIT (FULL-AUTO AIR CONDITIONER)].)
1		No	Go to the next step.
2	VERIFY FRONT BLOWER MOTOR OPERATION • Switch the ignition ON (engine off or on). • Set the airflow volume control dial to 1 or more. • Does air flow from the vent after operating the front blower motor?	Yes	Go to the next step.
2		No	Go to the following malfunction symptom item. (See AMOUNT OF AIR BLOWN FROM FRONT VENTS DOES NOT CHANGE [FULL-AUTO AIR CONDITIONER].)
3	VERIFY AIRFLOW CONDITION • Does air flow from the vent when the airflow mode is in the VENT mode?	Yes	Go to Step 7.
3		No	Go to the next step.
4	VERIFY VENT CONDITION • Is the air vent (right and left/center) closed?	Yes	Open the air vent, then go to Step 13.
4		No	Go to the next step.
5	INSPECT AIR VENT FOR CLOGGING • Is the air vent clogged?	Yes	Remove the obstruction, then go to Step 13.
5	INSPECT AIR VENT FOR CLOGGING • Is the air vent clogged?	No	Go to the next step.
6	VERIFY DUCT INSTALLATION CONDITION • Is the duct (installed to dashboard) installed to the position correctly and securely? (See DASHBOARD REMOVAL/INSTALLATION.)	Yes	Inspect ducts for restriction, deformity, and air leakage, then go to Step 13.
6		No	Install the incorrectly installed ducts properly, then go to Step 13. (See DASHBOARD DISASSEMBLY/ASSEMBLY.)
7	VERIFY AIRFLOW CONDITION • Does air flow from the vent when the airflow mode is in the HEAT mode?	Yes	Go to Step 10.
7		No	Go to the next step.
8	INSPECT AIR VENT FOR CLOGGING • Is the air vent clogged?	Yes	Remove the obstruction, then go to Step 13.
8	INSPECT AIR VENT FOR CLOGGING • Is the air vent clogged?	No	Go to the next step.
9	VERIFY DUCT INSTALLATION CONDITION • Is the duct installed to the position correctly and securely? (See FRONT HEAT DUCT REMOVAL/INSTALLATION) (See REAR HEAT DUCT No.1 REMOVAL/INSTALLATION.)	Yes	Inspect ducts for restriction, deformity, and air leakage, then go to Step 13.
9		No	Install the incorrectly installed ducts properly, then go to Step 13. (See FRONT HEAT DUCT REMOVAL/INSTALLATION.) (See REAR HEAT DUCT No.1 REMOVAL/INSTALLATION.)
10	VERIFY AIRFLOW CONDITION • Does air flow from the vent when the airflow mode is in the DEFROSTER mode?	Yes	Go to Step 13.
10		No	Go to the next step.
11	INSPECT AIR VENT FOR CLOGGING • Is the air vent clogged?	Yes	Remove the obstruction, then go to Step 13.
11	INSPECT AIR VENT FOR CLOGGING • Is the air vent clogged?	No	Go to the next step.
12	VERIFY DUCT INSTALLATION CONDITION • Is the defroster duct installed to the position correctly and securely? (See DASHBOARD REMOVAL/INSTALLATION.) • Are the defroster ducts installed properly? (See DASHBOARD REMOVAL/INSTALLATION.)	Yes	Inspect ducts for restriction, deformity, and air leakage, then go to the next step.
12		No	Install the incorrectly installed ducts properly, then go to the next step. (See DASHBOARD DISASSEMBLY/ASSEMBLY.)
13	VERIFY THAT MALFUNCTION SYMPTOM DOES NOT RECUR AFTER REPAIR • Is air discharged from vent? • Does air flow from the vent while in each airflow mode?	Yes	Troubleshooting completed. Explain repairs to customer.
13		No	Recheck malfunction symptoms, then repeat from Step 1 if the malfunction recurs.