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Replacing Stepper Motor(s)

Discussion in 'GM Electrical Tech' started by stinger44, Jan 5, 2011.

  1. stinger44

    stinger44 New Member

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    Anyone replace the stepper motor for the speedometer? Looked in the DIY thread and didn't see anything. Could someone post the instructions for removing the instrument cluster and replacing stepper motors, etc.? My speedometer is getter worse.
    Thanks
    #1
  2. 99'HEARTBEAT

    99'HEARTBEAT Moderator

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    Here is a Great Write-up with Step by Step on removing and replacing the Stepper Motor's.......

    If the needles in your gauge cluster flutter, stick, or stop working you may have a bad stepper motor.
    Dealerships want $400-$700 to replace the whole cluster, but you can replace just the motor for around $10.

    Time: 1-2 hours

    Cost: About $10 for 1 stepper motor (part: X-C5-168 or X-25-168)

    The Below E-Bay Link....has the Site that's Sells New Stepper motor's,
    http://motors.shop.ebay.com/i.html?_kw=Chevy&_kw=stepper&_kw=Motor&_kw=Silverado&_kw=Cluster

    Tools:
    Stepper Motor/s
    Phillips Head Screwdriver
    9/32 Socket
    Soldering Iron
    Solder

    Step 1 (Remove dash faceplate)
    The dash bezel is has clips.....getting your finger's between the bezel and gently pull,once you have the first one off go all the way around......Also you will need to drop the Column shifter down to 3rd and drop the steering wheel all the down and then there are 4 screws holding the Dash in place....remove those screws and then unplug the wiring harnesses Take your time in doing this....once the dash cluster will now come out,

    Step 2 (Remove gauge cluster)
    You will now be able to access the gauge cluster. Remove the 4 screws holding the cluster in place and then unplug the wiring harness.

    [​IMG]

    Step 3 (Disassemble cluster)
    The cluster is constructed from 3 pieces which are held together with clips. Remove the front clear cover by unfastening the clips.

    [​IMG]

    You will now have access to the gauge needles.
    **IMPORTANT TO FOLLOW CALIBRATION STEPS PRECISELY***
    Place tape at the end of each needle.

    Turn each needle counter-clockwise until it stops as shown below and then mark off the location on the tape with a pen. If you do this, you should have no issues with calibration when you reassemble.

    [​IMG]

    Once you have your positions marked, turn each needle counter-clockwise until it breaks free from the shaft. Then use a fork to pry each needle off. It will take a little force, but just be slow.

    [​IMG]

    Unfasten the remaining clips that hold the back cluster cover in place and remove. You will then be able to pull the circuit board off.

    Notice the 6 stepper motors, each about the size of a quarter.

    [​IMG]

    Step 4 (Replace stepper motor)

    On the reverse side of the circuit board you will need to desolder the 4 points that are holding the motor on. These are easy to determine as they stick up a bit more.
    Heat the solder and use a solder-sucker to remove the solder. If you don't have a solder-sucker, you can have an extra hand pry at the motor from the other side as you heat.
    **Just be careful not to heat things up too much as this is a circuit board and you can harm other components if not careful.
    I was replacing my speedometer motor, so I desoldered the following points.

    [​IMG]

    Once the old motor is off, make sure the holes are clear of solder and put your new motor in.
    Resolder your 4 points and place the circuit board on the back cover. Fasten the overlay piece back on now.
    Now press each needle back on in the 12 o-clock position. Then turn each needle back to your mark on the tape. If you miss the mark just keep turning counter-clockwise until you come around again.

    [​IMG]

    To test things out, plug the wiring harness back to the cluster. You should immediately see the needles jump down and then up to the original 'zero' points.
    Make sure the needle for your new motor moved. You should really test this out first before reassembling everything to make sure your needles go back to their original points.
    Typically, the gas gauge needle is a tick or so below empty. My RPM gauge was also about 100 rpm under zero at the rest position, so I made sure they were exactly in the same spot after I plugged the cluster back in.
    Yours may differ slightly.
    Once you determine your needles are correct, just snap the clear plastic cover back on the gauge.

    Step 5 (Reassemble)

    Attach the cluster back to the dash and reassemble the dash in reverse order.

    You are done!
    Last edited: May 28, 2011
    #2
  3. stinger44

    stinger44 New Member

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    Thank you!
    #3
  4. stinger44

    stinger44 New Member

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    Question regarding step 3. Do all the needles need to be turned back counter-clockwise to the stop if I'm not replacing that particular stepper motor? What's the reason they all have to be turned back? Must be they all have to be recalibrated when disconnnected perhaps?

    Thanks again.
    #4
  5. 99'HEARTBEAT

    99'HEARTBEAT Moderator

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    Only for the Gauges in which you are replacing the stepper motor.....do they need to be tuned back.
    #5
  6. wis bang

    wis bang New Member

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    This should be a 'sticky'...
    #6
  7. Als09Sierra

    Als09Sierra New Member

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    Yeah Mike, nice write-up.
    #7
  8. stinger44

    stinger44 New Member

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    That makes sense.. thanks.
    #8
  9. jreagan

    jreagan New Member

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    Since you have to remove ALL the needles to get the front off the cluster, do ALL the needles go back to 12 o'clock even for motors you didn't replace? Or do you put those back right at their pencil marks?
    #9
  10. stinger44

    stinger44 New Member

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    Thanks Heartbeat, I managed to get around to replacing my speedometer motor today. Directions were very good. My struggles were with disconnecting the stupid cluster from the connector and getting the clear face off from the clips. lol

    Other than that, my speedometer is reading 1.5-2MPH faster now (as compared to GPS) but that's no biggie. Probably didn't have the needle exactly on the mark when I put it back together.

    Thanks!
    #10
  11. 99'HEARTBEAT

    99'HEARTBEAT Moderator

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    That's Great hear!!.....Your Speedometer being off, also may be due to a change in tire size....meaning if the Overall Diameter of your Tires Changed from the Overall Diameter of the Stock Tires that came with the Truck from the Factory.....that would cause your Speedometer to be off.
    #11
  12. stinger44

    stinger44 New Member

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    I suppose that could be true. I bought the truck used and it had new tires on it. I don't think the tire size is different but who knows. Thanks again.
    #12
  13. 99'HEARTBEAT

    99'HEARTBEAT Moderator

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    The way to check to see if your Tires are Different from what they came with from the Factory......opening the driver door and there should be a White Sticker and on it will be......the Weight of the Truck...the Vin # Number and what Size Tires and Rims the truck had on it from the Factory.
    #13
  14. GNX-Fan

    GNX-Fan New Member

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    ***EDIT****
    Sorry, I thought the write-up was yours. Found the original write up over on Trailvoy. I'll PM the thread originator.
    #14
  15. stinger44

    stinger44 New Member

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    Yeah, I'm aware of the sticker showing passenger tire size and inflation, etc. Current tires are the correct size. Like I said, not a biggie. It's only off by 1MPH or so.
    #15
  16. ndfangoirish

    ndfangoirish New Member

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    Does anyone have information about replacing the backlight for the Gear Selector and also the guages?

    ---------- Post added at 07:47 AM ---------- Previous post was at 07:45 AM ----------

    Any information about replacing the back lighting in the instrument cluster? For the gauges as well the gear selector window.
    #16

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