NO.6 INSUFFICIENT AIR (OR NO AIR) BLOWN REAR VENTS

id070300802000

6 | Insufficient air (or no air) from rear vents
DESCRIPTION | • Problem with each rear vent and/or duct • Rear airflow mode does not change when front and/or rear climate control unit mode switches.
POSSIBLE CAUSE | • Rear vent mode malfunction • Rear heat mode malfunction • Rear airflow mode actuator malfunction • Open, short circuit in wiring or poor connection between front and rear climate control unit

Diagnostic procedure

STEP | INSPECTION | ACTION
--- | --- | ---
1 | INSPECT TO SEE WHETHER MALFUNCTION IS IN VENT MODE • Does air blow out when in the rear vent mode? | Yes | Go to the Step 6.
No | Go to the next step.
2 | VERIFY THAT REAR HEATER CONTROL USING FRONT CLIMATE CONTROL UNIT • Turn the rear heater to ON and OFF using the front A/C control panel. • Is it possible that the rear heater turns ON and OFF using the front climate control unit? | Yes | Go to Step 4.
No | Go to the next step.
3 | INSPECT TO SEE WHETHER MALFUNCTION IS IN WIRING HARNESS (OPEN, SHORT OR POOR CONNECTION OF TERMINALS BETWEEN FRONT AND REAR CLIMATE CONTROL UNIT) OR ELSEWHERE • Inspect for open, short or poor connection of terminals between front and rear climate control unit. ― 3B—B ― 3C—C ― 3E—E ― 3I—I • Is there any open, short or poor connection of terminals? | Yes | Repair or replace malfunctioning part, then go to Step 10.
No | Go to the next step.
4 | INSPECT VENT • Is the vent clogged? | Yes | Remove obstruction, then go to Step 10.
No | Go to the next step.
5 | VERIFY THAT REAR A/C DUCT IS INSTALLED • Is the rear A/C duct properly installed? | Yes | Inspect the duct for clogging, deformation and air leakage, then go to Step 10.
No | Install the duct securely in the proper position, then go to Step 10.
6 | INSPECT TO SEE WHETHER MALFUNCTION IS IN REAR HEAT MODE • Does air blow out when in the rear heat mode? | Yes | Go to the next step.
No | Inspect the rear vent for clogging, then go to Step 10.
7 | INSPECT REAR VENT • Is the rear vent clogged? | Yes | Remove obstruction, then go to Step 10.
No | Go to the next step.
8 | INSPECT REAR AIRFLOW MODE ACTUATOR • Inspect the rear airflow mode actuator. (See REAR AIRFLOW MODE ACTUATOR INSPECTION.) • Is the rear airflow mode actuator normal? | Yes | Go to the next step.
No | Replace the rear airflow mode actuator, then go to Step 10.
9 | INSPECT TO SEE WHETHER MALFUNCTION IS IN WIRING HARNESS (OPEN, SHORT OR POOR CONNECTION OF TERMINALS BETWEEN FRONT CLIMATE CONTROL UNIT AND REAR AIRFLOW MODE ACTUATOR) OR ELSEWHERE • Inspect for open, short or poor connection of terminals between front climate control unit and rear airflow mode actuator. ― 2P—C ― 2B—A ― 2D—E ― 1L—F ― 1J—G • Is there any open, short or poor connection of terminals? | Yes | Repair or replace malfunctioning part, then go to next step.
No | Replace the front climate control unit, go to the next step.
10 | VERIFY REPAIR • Does air blow from the rear A/C vent mode? | Yes | Troubleshooting completed. Explain repairs to customer.
No | Recheck malfunction symptoms, then repeat from Step 1 if the malfunction recurs.