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

id0703c1006100

DESCRIPTION

•  Insufficient airflow from vent or duct

•  No airflow from vent or duct

•  Rear 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 rear climate control unit terminal V

•  Short to ground in wiring harness between rear climate control unit terminal V and ROOM 15 A fuse

•  Rear airflow mode actuator connector or terminal malfunction

•  Rear climate control unit connector or terminal malfunction

•  Rear airflow mode actuator malfunction

•  Rear climate control unit malfunction

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

―  Rear climate control unit terminal W — rear airflow mode actuator terminal C

―  Rear climate control unit terminal Q — rear airflow mode actuator terminal B

―  Rear climate control unit terminal O — rear airflow mode actuator terminal A

―  Rear climate control unit terminal A — rear airflow mode actuator terminal D

―  Rear climate control unit terminal C — rear airflow mode actuator terminal E

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

―  Rear climate control unit terminal W — rear air mix actuator terminal A

―  Rear climate control unit terminal O — rear air mix actuator terminal C

•  Rear airflow mode link malfunction

―  Lack of grease

―  Bad installation

•  Rear 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 REAR 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 rear blower motor?

Yes

Go to the next step.

No

Go to the following malfunction symptom item.

(See AMOUNT OF AIR BLOWN FROM REAR 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 closed?

Yes

Open the air vent, then go to Step 10.

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 10.

No

Go to the next step.

6

VERIFY DUCT INSTALLATION CONDITION

•  Is the duct (installed to rear A/C unit) installed to the position correctly and securely?
(See REAR COOLER DUCT REMOVAL/INSTALLATION.)

Yes

Inspect ducts for restriction, deformity, and air leakage, then go to Step 10.

No

Install the incorrectly installed ducts properly, then go to Step 10.

(See REAR COOLER DUCT REMOVAL/INSTALLATION.)

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 10.

No

Go to the next step.

9

VERIFY DUCT INSTALLATION CONDITION

•  Is the duct installed to the position correctly and securely?
(See REAR HEAT DUCT No.2 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 REAR HEAT DUCT No.2 REMOVAL/INSTALLATION.)

10

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 REAR 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 rear blower motor?	Yes	Go to the next step.
2		No	Go to the following malfunction symptom item. (See AMOUNT OF AIR BLOWN FROM REAR 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 closed?	Yes	Open the air vent, then go to Step 10.
4	VERIFY VENT CONDITION • Is the air vent closed?	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 10.
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 rear A/C unit) installed to the position correctly and securely? (See REAR COOLER DUCT REMOVAL/INSTALLATION.)	Yes	Inspect ducts for restriction, deformity, and air leakage, then go to Step 10.
6		No	Install the incorrectly installed ducts properly, then go to Step 10. (See REAR COOLER DUCT REMOVAL/INSTALLATION.)
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 10.
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 REAR HEAT DUCT No.2 REMOVAL/INSTALLATION.)	Yes	Inspect ducts for restriction, deformity, and air leakage, then go to the next step.
9		No	Install the incorrectly installed ducts properly, then go to the next step. (See REAR HEAT DUCT No.2 REMOVAL/INSTALLATION.)
10	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.
10		No	Recheck malfunction symptoms, then repeat from Step 1 if the malfunction recurs.