Pulled codes and found out I'm PAST my limit!

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Cadillac DeVille 1985 to 2005 including:
1985-1992 Fleetwood, 1993 Sixty Special, All FWD Forum Discussion, Pulled codes and found out I'm PAST my limit! in Past Cadillac Vehicle Discussion; Pulled the codes today after I noticed that the drivers side A/C blows warmer (by hand it seems like 5 ...
  1. #1
    JVRudnick's Avatar
    JVRudnick is offline Cadillac Owners Fanatic
    Automobile(s): 2001 DTS : 2005 CTS
    Join Date
    Mar 2006
    In Waterdown, near Toronto, Ca

    Pulled codes and found out I'm PAST my limit!

    Pulled the codes today after I noticed that the drivers side A/C blows warmer (by hand it seems like 5 to 10 deg?) than the pass side....and I got a IPM B0409.

    Search here tells me this is something to do with the 'actuator'

    So...past my ken here, what do I need to do to get this fixed? What'd same cost say at a dealer or at my local garage? And if I don't fix it, what will that lead to?

    Oh, forgot...all winter the drivers side vents pushed cold air even with the heater on FULL and only the pass side got the nice hot air. Had my heater core totally flushed, but made no difference....



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  3. #2
    Dave S Texas's Avatar
    Dave S Texas is offline Cadillac Owners Enthusiast
    Automobile(s): '87 Coupe DeVille 4.1L FWD(New engine '08) 1981 F100 '03FXDL
    Join Date
    May 2008
    Austin(area), Tx

    Re: Pulled codes and found out I'm PAST my limit!

    IPM is air-bag related. Not a DIY job.

    "So...past my ken here..." What?? Explain

    The air flow problem is most likely a vacuum problem: loose/bad hose, disconnected hose, faulty vacuum motor, programmer fault.

  4. #3
    JimD is offline Cadillac Owners Connoisseur
    Automobile(s): '98 STS (RIP @ 206,xxx miles)
    Join Date
    Sep 2003
    Metro ATL

    Re: Pulled codes and found out I'm PAST my limit!

    B0409 - Air Mix Door #1 Range Error

    There are several (many!) electric door acutators buried in the HVAC plumbing forward of and under your dashboard. One of them (#1) is reporting the wrong position information back to the HVAC control module.

    It "could be" a failed acutuator.

    Or it could be as simple as one actuator is out of sync with the control module. It will be worth your time to try the following and check the results;

    Key On
    Select one of the Manual modes with the <MODE> button
    A/C Off
    Fan speed minimum
    Select driver side and passenger side temperature to 60F/15C
    Slowly (one detent at a time) increase both temperature selections to 90F/32C
    Repeat down to 60F/15C
    Key Off

    Consider doing the above several times. No guarantees given or implied....

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  6. #4
    Submariner409's Avatar
    Submariner409 is offline If it won't run, chrome it
    Automobile(s): 2002.5 F55 STS - 67,500 miles, 2014 Explorer XLT FWD
    Join Date
    Feb 2006
    MD Eastern Shore, Kent Island

    Re: Pulled codes and found out I'm PAST my limit!

    Scotch/Irish/English/Canadian for "out of my field of knowledge"..........

    In the right console/footwell area and in front of the glove box (Oh, joy...) are a couple of electric actuator motors and gears which control air distribution. There is a history of these actuators either physically breaking or having bad electrical connections.

    Either get on eBay for a Helm/GM Factory Service Manual or subscribe your car to www.alldatadiy.com for one or three years.

    (Typing at the same time as JimD.)

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