Gauge Cluster Speedometer Motor- how can i get it to work?

Discussion in 'General Electronics Chat' started by cduluk, Dec 21, 2009.

  1. cduluk

    Thread Starter Member

    Aug 2, 2009
    14
    0
    Hey guys.

    I am working on a gauge cluster modification in my car and need some help.

    Some car gauge clusters do this neat trick where the gauge needles rotate all the way in one direction, and all the way back in a few seconds- upon start-up.

    See this vid of the Lexus IS cluster: Watch the speedo and tach needles
    http://www.youtube.com/watch?v=ZAKacaoNN04

    I want to make my car's gauge needles do the same thing.
    I thought i could run a relay that would break the factory circuits to the needle motors upon startup for maybe 3 seconds. And during these 3 seconds, i can maybe use a motor driver to send the right signals to the motors so that the needles swing right and left just like the needles from the cluster in the Lexus IS. Then after the 3 seconds, the relay connects the factory circuit so the cluster performs normally.

    My only problem is that i don't know how the gauge cluster motors work. I am assuming they're stepper motors (but i could be totally wrong).

    I bought a used cluster from a Lexus Rx330 (which use the same motors as my 2008 Lexus Rx400h cluster) so i can test out the motors before i do it to my actual cluster.

    Here is the cluster taken apart. I’m focusing on the speedometer needle motor.

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  2. cduluk

    Thread Starter Member

    Aug 2, 2009
    14
    0
  3. cduluk

    Thread Starter Member

    Aug 2, 2009
    14
    0
    [​IMG]
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    Now, on the back of the speedometer needle motor is a 14 digit number. But the tach, fuel and temp motors all have a different 14 digit number.
    The speedo number is: BO 41123.214157.3
    The tach number is: BO 41123.214214.1
    The fuel number is: BO 41123.214142.5
    The temp number is: BO 41123.214126.7


    Not sure if these numbers mean anything?
    Can anyone give me some information as to how I should go about doing this modification? Upon start-up, i want the speedometer needle to:


    1. Start at 0mph (where it would be anyways)
    2. Be rotated 225 degrees clockwise from the 0mph spot
    3. Be rotated 225 degrees counter-closkwise back to the 0mph spot


    In about 2 seconds.

    I want to figure out how to do the speedometer needle first, then i'll worry about the other needles...


    Thanks for any help!
     
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