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Climate: where is the cabin temperature sensor?

11K views 3 replies 2 participants last post by  doru  
#1 ·
Hi all,
I have troubles with the climate system from not cool enough, to different temps to different outlets.

But first where is the temperature sensor? FSM page AC(diag)-6 and AC(diag)-3 clearly states the sensor should be on the driver side of the central console, under dash. There is a grill cut into the side trim for the air to circulate to the sensor. The troubleshooting says to test the airflow - none. Then take the trims apart and see if something is obstructing the "aspirator hose, in-vehicle sensor" - there is no hose and no sensor that I can see.

I have dual climate but that should not matter.

Thanks
 
#3 ·
Lots of people from what I can tell. The dashboard is not original (it even has the Legacy donor car VIN on it). The wires are all over the place.
The car had the airbag recall done twice.
Wrong screws in the wrong holes.
Clips broken or missing.
Various parts brackets broken.
The list can go on and on...

This is a 2009 car and things are not exactly like FSM is describing them. The diagnose for AC control panel describes some expected behavior. What I observe are behaviors very close to that but not exactly. One example is what the display should show and what I see is slightly different. The system passes the self test, though.

Now back to the sensor ... there is a white duct that is connected to a black thing that might be the sensor. But the duct is going up in the dashboard and it is connected to something there. So it is not directly connected to the air in the cabin. The duct is also badly crushed because there is no space for it in there next to steering column metal bracket reinforcement - see picture.
Does anyone know how this is suppose to be on a 2009 3.0 R?

BTW the self test for the system (with pressing front defrost and A/C buttons while stating the car) does not work - it does not get into. The self test for AC panel and controller works fine and passes.
Is there something else that should be done to get it to enter the system test?

512590

512591
 
#4 ·
Based on the FSM for 2010 Legacy (it looks different but has better writing) I concluded that the black box at the end of the white hose in my pictures above is the cabin temperature sensor or as Subaru calls it "in-vehicle sensor". The white hose is called the aspirator hose and it is connected at the top to the aspirator - a fan sucking air from the hose and thus from the temp sensor.

I also concluded that in my car the sensor is now in a wrong position. The sensor should face the grill cut in the trim panel under and right of the steering column. That will also allow space for the hose to bend nicely as there is plenty of space forward but not sideways. Basically I need to reinstall the sensor rotated 90 degrees to the left.

As for the automated testing FSM is wrong for my 2009 OBK. Using the 2007 FSM and 2009 FSM I was able to figure it out. Here are my notes, maybe someone else will find them useful...

Perform self diagnostic for AC control system - see FSM page AC(diag)-12
From 2009 FSM:
THIS DOESN'T WORK TO GET INTO DIAGNOSTIC. USE 2007 PROCEDURE!
-Start the engine with the A/C switch and front defroster switch pressed.
NOTE: Self-diagnosis can also be performed with ignition switch ON, but start the engine because observing
the magnet clutch operation is difficult.
- All the indicators blink four times.

From 2007 FSM combined with this post :
THIS WORKS TO GET INTO DIAGNOSTIC
-Turn ignition switch from OFF to ACC and wait for 2 seconds.
-Start the engine with the AUTO switch and FRESH/RECIRC pressed.
All the indicators will blink 4 times. It will then automatically change to inspection mode of sensor and potentiometer. The sunload sensor will likely indicate open circuit unless it is under direct sun. If there is no malfunction code 20 is displayed.
-Change to the actuator, blower fan, and magnet clutch inspection mode by pressing windshield defroster switch. Every 4 seconds it will cycle through testing each. (or when A/C is pressed)

All indicators blinked 5 times not 4 as per FSM.
Then 20 code blinked.
To get into "automatically change to the Inspection Mode of sensor and potentiometer." press front defrost switch. The codes 31 to 38 corresponding to each test mode (see table "OPERATING MODE TABLE" on page AC(DIAG) - 13) are displayed as driver and passenger temperatures. The other display indicators state correspond to the table columns. The display flashes during the test.
While in auto testing mode you can switch to manual (meaning it will stay in each test until manually switched to the next so you can check which vents are blowing air) by pressing A/C button.
You can get out of the testing back to 20 20 flash screen by pressing AUTO button.

Note that for performing self diagnostic for AC control panel I also had to use both manuals:
USE 2009 DIAG PROCEDURE page AC(diag)-3
USE 2007 "SWITCH CHECK TABLE, OPERATION" for the right display elements.