2021 Peterbilt 579 4 dash switches not working

Discussion in 'Trucks [ Eighteen Wheelers ]' started by RedPanda702, Feb 27, 2022.

  1. Feb 27, 2022 #1
    RedPanda702

    RedPanda702 Bobtail Member

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    Oct 14, 2021
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    I have a 21 Peterbilt 579 with mx13 engine and four dash switches are not working. Auto start, Air dump, 5th slide, and axle interlock. I tried pressing them and nothing happens. I looked at the fuses and they’re all good. Those 4 switches also aren’t lit up like the other dash switches are. Is there anything else I can check before I take it to the dealer?
     

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    RedPanda702, Feb 27, 2022
    RedPanda702, Feb 27, 2022
    #1
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  3. Feb 28, 2022 #2
    Goodysnap

    Goodysnap Road Train Member

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    Switches are datalinked to VECU. Dealer will likely need to connect Davie and relearn dash switches. Any recent work, updates or batts dead?
     
    Goodysnap, Feb 28, 2022
    Goodysnap, Feb 28, 2022
    #2
    spsauerland Thanks this.
  4. Mar 1, 2022 #3
    kranky1

    kranky1 Road Train Member

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    The electrical system in newer trucks is a nightmare. Petes and probably the rest of them almost all the circuits are duplexed or multiplexed. As an example, take all your cruise control and engine brake functions, 4 switches worth of them, 1 wire.
     
    kranky1, Mar 1, 2022
    kranky1, Mar 1, 2022
    #3
  5. Mar 1, 2022 #4
    spsauerland

    spsauerland Road Train Member

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    West Harrison, In
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    I'd pop off panel and see if daisy chain wire is connected.
     
    spsauerland, Mar 1, 2022
    spsauerland, Mar 1, 2022
    #4
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