2010 Cascadia HVAC SA25 SPN523331 04??

Discussion in 'Freightliner Forum' started by OneTwentyOne, Mar 2, 2021.

  1. OneTwentyOne

    OneTwentyOne Light Load Member

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    May 19, 2016
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    Good morning good people of this forum.

    I have a 2010 Cascadia with this code and I can't find it anywhere. I have the other code, same problem:
    HVAC Controller Sht Lo 146s254 04.

    Can anyone help me out? Much appreciated.

    Fern
     
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  3. SWM_TECH

    SWM_TECH Bobtail Member

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    Apr 15, 2018
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    SA 25 SPN523331 FMI 4 is Recirc Door Actuator-voltage below normal, open circuit.
    It appears like Recirculation Actuator Stepper Motor is supplied with power on LT BLU 338A4+ from pin 26 of Front control Unit (FCU) to stepper motor at pin2. Then there are 4 grounds on from stepper motor to FCU. But better to post the last six of your VIN if you want more detailed & accurate information.
     
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  4. RocketyMan

    RocketyMan Medium Load Member

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    @OneTwentyOne You should thank SWM_tech's post...and also supply last 6 of your vin.
     
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  5. OneTwentyOne

    OneTwentyOne Light Load Member

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    May 19, 2016
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    Good after noon, Sir, I did and even supplied my last six earlier this morning.

    I am checking back to find your msg, but not mine. My apologies for not making sure it posted. My bad.

    thanks to all for your help and here are my last six: AP1171, thanks again.
     
  6. OneTwentyOne

    OneTwentyOne Light Load Member

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    May 19, 2016
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    I figured out what happened, because I replied but was not signed in, my message was invisible.

    My apologies, and thanks for the communities help.
     
  7. RocketyMan

    RocketyMan Medium Load Member

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    upload_2021-3-3_13-18-47.png

    Here's the schematic for the recirc actuator.



    You should see the plenum just to the right of the dog house. The recirc actuator is underneath the blower motor. I bet water or something got on it. At any rate, test the wiring.
    upload_2021-3-3_13-27-25.png
     
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  8. OneTwentyOne

    OneTwentyOne Light Load Member

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    May 19, 2016
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    Good afternoon, I replaced the recirc solenoid and still get this code, I’m not electronically inclined . Any help would be appreciated.

    advanced thanks in this matter
     
  9. SWM_TECH

    SWM_TECH Bobtail Member

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    Apr 15, 2018
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    SA 25 SPN523331 FMI 4 is Recirc Door Actuator-voltage below normal, open circuit.
    Suggests that there is a wiring problem. Voltage below normal suggest there may be high resistance in wiring or an open means the wire might be completely broken.
    Each on of the four ground wires and the power wire that connects to the re-circulation Actuator Stepper Motor from the Front Control Unit (FCU) needs to be checked for integrity.
    I haven't faced this specific problem but generally speaking you need to unplug the harness at the stepper motor and and the front control unit. Then using a multi-meter in the continuity setting check for continuity on each of the four ground wires and the the power wire. RocketyMan has already posted the wiring diagram that has the wire color, circuit number and pin number in the connectors.
    If you have continuity then set your multi-meter to resistance and check the ohms. I would think for short wiring distance would be 0.3 ohms or less. Additionally, I have sometimes used a headlight that would be about 4 amp load and connected both ends of wire in question inline as part of circuit to power my test headlight for a couple seconds.. If test headlight lights up nice & bright your wire is good.

    If wire testing is more than your comfortable doing I suggest that the dealership might be a good option.
     
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  10. OneTwentyOne

    OneTwentyOne Light Load Member

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    May 19, 2016
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    Thank you. I will take a stab at it - dealer is out of the question - chasing an electrical gremlin could get costly....

    thanks again.
     
  11. SWM_TECH

    SWM_TECH Bobtail Member

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    Apr 15, 2018
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    Here is more simple wiring schematic that might be helpful. IMG_6429.JPG
     
    Last edited: Mar 27, 2021
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