DTCs from IPM. What are they telling me, exactly?
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1985-1992 Fleetwood, 1993 Sixty Special, All FWD Forum Discussion, DTCs from IPM. What are they telling me, exactly? in Past Cadillac Vehicle Discussion; Guys, My heater system does not seem to be working correctly in that the Mode switch, which is supposed to ...
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    DevilleNut is offline Cadillac Owners Fanatic
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    DTCs from IPM. What are they telling me, exactly?

    Guys,

    My heater system does not seem to be working correctly in that the Mode switch, which is supposed to allow the user to direct heated air to the floor, upper body, etc., does not seem to be operative. No matter how the switch is set, it only directs air through the upper air outlets. Also, in a quiet environment with the ignition on but the engine not running, I hear a sound from the dash that sounds like "breathing". I pulled DTC codes and found two of them from the IPM:

    B0249 - Heater/Defroster/AC Door Range Error

    B0429 - Temperature Control #3 Rear Circuit Range/Performance

    (I got these definitions from data on this web site).

    After clearing the codes and running diagnostics again, they reappear once more, so apparently there is a hard fault. I can understand the door range error being the cause of the "breathing" sound from the dash as the system tries to move the door to a different position, but I don't know what the Temperature Control error might be.

    Do any of you have experience with fixing these types of problems, and if so, how should I proceed? At the moment, I'm looking for ideas as the weather is not conducive to doing extensive or time-consuming repairs. It will probably have to wait until spring, but I'd like to get some idea of what kind of job I'm looking at and whether I can do it or whether it needs to go to a shop.

    Thanks,

    Bob

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    Submariner409's Avatar
    Submariner409 is offline If it won't run, stick on fender vents
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    Re: DTCs from IPM. What are they telling me, exactly?

    B 0429 is the air control door to the rear seat console. It should not affect your other Mode functions as far as floor, dash, windshield vent control.

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    DevilleNut is offline Cadillac Owners Fanatic
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    Re: DTCs from IPM. What are they telling me, exactly?

    Sub,

    Okay...but what about the code B 0249...???

    Bob

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    Ranger's Avatar
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    Re: DTCs from IPM. What are they telling me, exactly?

    I believe B0249 is pointing towards the mode door actuator. Either it is bad or the door (valve) is sticking and not allowing the actuator to move it full range or into it's requested position.

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    DevilleNut is offline Cadillac Owners Fanatic
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    Re: DTCs from IPM. What are they telling me, exactly?

    Ranger,

    Based on the sound coming from the dash, I'd guess that it is trying to move, but not succeeding. Got any idea how difficult it is to get access to this door to fix or repair it?

    Thanks,

    Bob

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    basscatt's Avatar
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    Re: DTCs from IPM. What are they telling me, exactly?

    Quote Originally Posted by DevilleNut View Post
    Ranger,

    Based on the sound coming from the dash, I'd guess that it is trying to move, but not succeeding. Got any idea how difficult it is to get access to this door to fix or repair it?

    Thanks,

    Bob
    ------------------------
    the MODE DOOR ACTUATOR controls WHERE the air blows from -
    floor/center vents/defroster -

    how difficult it is to get access to this door to fix or repair it
    DIFFICULTY depends on ability -
    the actuator in under the dash -
    not particularly "fun" - but not "brain surgery" either -


    there are probably write-ups in the TechTips forum -
    http://www.cadillacforums.com/forums...-tips-how-fix/

    here is one -
    http://www.cadillacforums.com/forums...r-fix-how.html

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