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Thread: MM3 Screen Blank - Please Help

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    Dbro9898's Avatar

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    MM3 Screen Blank - Please Help

    This morning it worked fine, but this afternoon my MM3 screen is blank.

    The light on the right of the screen blinks red, red, green, red, red.

    Then a pause starts over again.

    I tried to unplug it momentarily, possibly to reset, but that had no effect.

    It blinks all of the time. Even with the ignition turned off.

    Any thoughts or advice is greatly appreciated.

    P.S. It is only about three months old.

    Thanks!!!

    2018 3500 Laramie DRW 4:10

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    MOD watersupply189's Avatar

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    Re: MM3 Screen Blank - Please Help

    Do a load test on each of your batteries to rule them being weak or flawed.

    The MM3 loves the juice, and a weak battery will cause it to have issues.

    Please keep us informed what you find, friend.


    2016 Ram Laramie 3500, G56, 6.7, CC, 4x4

    2016 RAM 3500 4x4 Laramie Crew Cab
    Cummins,G56, Rough Country level, Morimoto LED fog lights, LED headlights, Lund Attitude Steps sprayed with Line-X, DRL's Activated, 35x12.50R18 Falken Wildpeak ATW3, Fuel Vapor Wheels Matte Black w/Dark Tint, A.R.E. Truck cap and swing boxes

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    Re: MM3 Screen Blank - Please Help

    I would also try unplugging it from the obd2 port then plugging it back in.

    As @watersupply189 said, check your batteries too.

    When I let my truck sit for a while, I get the same problem, I put it on the charger overnight, and it goes away.

    Sent from my SM-N975U using Tapatalk

    18 BigHorn 2500 Delmonico Red

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    Dbro9898's Avatar

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    Re: MM3 Screen Blank - Please Help

    Thanks, guys.

    I already tried the port.

    I'll check the batteries.

    That makes sense cause it has not been out of town for a couple of weeks and has not had any recharge time lately.

    2018 3500 Laramie DRW 4:10

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