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There are a lot of important components in your instrument cluster, and it's only a matter of time before you'll need to pull it out to fix something. It's not such a daunting task, once you know a few tricks. This guide should help with this task.

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  1. Removing Mercedes W123 Instrument Cluster, Instrument Cluster: 1 단계, 이미지 1/1
    • Begin by disconnecting your battery, pulling off the negative (-) ground cable.

    • This is required for this process! There is a constant 12v supply of power to your car's clock, even when the key is off. If you attempt to pull the cluster out with the battery connected you will burn up part of your cluster's circuit board, or worse yet hurt yourself.

  2. Removing Mercedes W123 Instrument Cluster: 2 단계, 이미지 1/1
  3. Removing Mercedes W123 Instrument Cluster: 3 단계, 이미지 1/1
    • The cluster is held in by tension alone. There are no fasteners.

    • Reach up under the dash, feel your way past any wires and/or sound insulating material until you can touch the back of the cluster. Then push it firmly outwards towards the steering wheel.

  4. Removing Mercedes W123 Instrument Cluster: 4 단계, 이미지 1/1
    • Once the cluster starts to come out, you can pull it further out by the upper edge.

  5. Removing Mercedes W123 Instrument Cluster: 5 단계, 이미지 1/1
    • Pull the cluster out until you feel the tension of the speedometer cable.

    • Normally, there will be just barely enough room for you to get your hand behind the cluster. You will need to feel around the center of the cluster, behind and to the right of the center of the speedometer cable, for the connection for the speedometer cable.

    • The cable screws on to the back of the cluster with a knurled knob. It is to be loosened by hand. No tools will be necessary to unscrew this. Unscrew the cable until it is free of the cluster.

    • If your speedometer cable is especially taut behind the cluster, you may need to go back to step 2 and try to remove it by feel before pushing the cluster out by hand.

    If your hand still can't reach the speedo cable, go underneath the car and trace where the cable is clamped to the engine block. Detach this clamp with a screwdriver or pliers and this will release the cable to give your hand the extra inches to reach and unscrew the speedo cable from the rear of the instrument cluster. Remember to re-attach that clamp after.

    Bobby De Jesus - 답글

    This explanation is thorough, easy to follow and great pics thank you very much.

    Johnny - 답글

  6. Removing Mercedes W123 Instrument Cluster: 6 단계, 이미지 1/1
    • With the speedometer cable disconnected you will be able to pull the cluster out further for more working room.

    • Starting on the right side, begin disconnecting the items that attach to it.

    • First, you will pull out any light bulbs that plug in to the right hand side of the cluster. On a diesel W123 this will include the glow plug bulb and seatbelt bulb. Then unplug the spade connector for the power supply to the clock.

  7. Removing Mercedes W123 Instrument Cluster: 7 단계, 이미지 1/2 Removing Mercedes W123 Instrument Cluster: 7 단계, 이미지 2/2
    • Next, unplug the two small plugs near the middle of the cluster.

  8. Removing Mercedes W123 Instrument Cluster: 8 단계, 이미지 1/1
    • Next, use a 10mm wrench to unscrew the oil line from the oil gauge.

    • Lastly, unplug the large round plug on the far left of the cluster, down and to the left of the oil gauge fitting.

  9. Removing Mercedes W123 Instrument Cluster: 9 단계, 이미지 1/1
    • With everything disconnected you can now remove the cluster, carefully working it up and out past the steering wheel.

  10. Removing Mercedes W123 Instrument Cluster: 10 단계, 이미지 1/1
    • With the cluster removed on this car, let's take a second to identify some of the connections:

    • Speedometer cable

    • Oil line fitting

    • Small plugs for cluster accessories and lighting

    • Large primary plug

    • Not pictured are the wires and bulbs for the glow plug and seat belt light, and the spade plug for the clock. Keep track of which bulb went in which socket - the wires will be different colors. On this car the wire for the seat belt light was green and the glow plug bulb wire was blue.

  11. Removing Mercedes W123 Instrument Cluster: 11 단계, 이미지 1/2 Removing Mercedes W123 Instrument Cluster: 11 단계, 이미지 2/2
    • You can now take the cluster to your work bench to undertake whatever job you removed it for.

    • Let's review the components, both front and back:

    • Oil pressure gauge, gas gauge, and engine temperature gauge

    • Speedometer, odometer and trip odometer

    • Tachometer and clock

  12. Removing Mercedes W123 Instrument Cluster: 12 단계, 이미지 1/1
    • And a bit more detail about the components on the back of the cluster:

    • Light bulb sockets (some are used, others are blanked out)

    • Speedometer cable connection

    • Rheostat (dimmer) control

    • Oil line connection

    • Clock spade connector (note +12v symbol, this is the constant 12v supply that can damage your cluster if battery is not disconnected)

    • Large primary cluster pins

    • Accessory plugs

    Great !!!. Very ckear and usefull information.

    Thank you.

    Sri Kusno Gularso - 답글

    Nicolas is right on with an excellent explanation and pictures. The insulation pad under the cluster is a pain, and I removed it in my car. It may be good in cold climates. Nicolas posted on 1984 Mercedes-Benz W123 power window relay replacement? 3/26/15 the best answer for stuck windows. The relay is many times the reason windows get stuck and dont go up or down. No other forum has addressed that which is so important. You need to pull the instrument cluster half way by disconecting the speedometer cable ONLY. Then you can replace the window relay. Of course first you check the fuses, then you can check the door panel to see if the motor is working by disconnecting the motor wires and testing it up with a 12 v or 18 v battery from a power tool, then you check the switches, I usually replace them by extra ones that are in working condition. Then finally if nothing works I go and replace the window relay.

    Mariolaima

    Mario Laima - 답글

결론

To reassemble your device, follow these instructions in reverse order.

다른 47명이 해당 안내서를 완성하였습니다.

Nicolas Siemsen

회원 가입일: 2013년 12월 06일

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14 Comments

Any chance you can tell us what color of wires goes on each of the 15 pins from the large primary plug (Cluster pins) or even show a picture of where it all goes? Some of my wires got mixed up and it's really hard to tell which wires goes to what pins...

brandon - 답글

FYI I have a 85' CD300 if that helps. ;-)

brandon -

Hi, here is a link to a picture of the pin out diagram for the 15 pin plug behind the cluster.

http://www.benzworld.org/forums/attachme...

Nicolas Siemsen -

Hi all, I am looking for Mercedes Benz W123 speedometer part no. 1235423601 0085425606

Any idea where I can find a store or supplier providing genuine new parts, thanks

Jesmond Mifsud - 답글

Does it matter what direction the accessory plug on the speedometer is plugged in? It seems to go on both ways and I'm not sure if I am installing it right!

fixitsteve - 답글

you get an answer to this?? dont know which way mine are supposed to go back in either!

aaronmcgrattan -

Hi everyone , any link for the dash board wiring for W126 ?

I have a problem with the small plugs , all the wires are out and didn't know which color goes in which hole.

THANK YOU

leonbmh - 답글

Nicolas - your post of 2/4/16 with the link to a diagram of the wire colors of the 15 pin plug may well be correct for SOME MB - but it’s surely not what I have in my 94 E320!!! I’ve been chasing my tail (actually trying to isolate a short in the coolant temp gauge - which is the green wire at #2 - one of the colors on mine that happens to match the diagram you referenced) for some MONTHS - since paying a local shop to replace the infamous BIODEGRADABLE engine wiring harness. What a FIASCO - MB should be TARRED and FEATHERED for this one!

Pale Writer - 답글

Hi all, I have a 1983 240D, replaced my fuel gauge, oil pressure gauge and temp. gauge from a 1984 300D. My cluster is exactly like the one pictured above. I would like to know what is that relay next to the oil pressure connection for because the 300D odometer doesn’t have it, but everything seems to work fine. If someone knows please let me know, thanks.

Jose R Orellana - 답글

Where is the backlight bulb for the cluster situated?

stefan greyvenstein - 답글

Hab mir heute dank der Anleitung eine neue Uhr eingebaut.

Alles super erklärt.

Mein einziges Problem war, das ich zu große Hände hab. Da war das ab und an drehen des Tachos entwas schwierig.

Artur Pauls - 답글

Anyone know if there's a way to cap the oil line so I can keep driving my 300D while the instrument panel is removed and in the process of being repaired?

Joe Wiesenfelder - 답글

1968 280 se coupe (6 cylinders, sunroof): Please advise where I can find the instrument cluster for my '68 Mercedes Benz.

Rusty Contella 321 288-1236, email: tradeamericaholdings@gmail.com

Robert Contella - 답글

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