Where is cluster plug? - 2004 Chevrolet TrailBlazer

Could be the plug at the back of the cluster. Corrosion. Fixed many by unplugging it and plugging it back in. Could be the cluster is bad also.

Check voltage and ground circuits for instrument cluster. If that checks out, I think there is a problem with instrument cluster, itself.
Any applicable trouble codes?
Some makes and models, you may be able to get cluster to do a self-test? To do that, you may need a scanner that can communicate with instrument cluster.

these are known for this prob,they say its a soldering problem on the back of the clusters

The odometer/trip meter work together via a IC and pulse motor. I just replaced the Instrument cluster in my 94 Corolla DX. I purchased a used cluster that had 230,000 miles showing( mine was 199,000). It' a "plug and play" system, electronic analog. The cluster I purchased the trip meter didn't function, I removed the speedometer from the cluster and applied some silicone spray to the plastic gears and now it's working, (the plastic gears are very fragile and after many miles and years they are prone to breakage). If you are lucky this might be a solution, If not buy a used instrument cluster and install it yourself and hope for the best (used). I didn't have a tachometer on my original cluster so I purchased a cluster with a Tach. The 94 DX and LE should be "plug and play",not sure about the CE. The change is quite simple tow screws remove the bezel, 4 screws remove the cluster, unpluy the connectors, 2 white 1 blue.The cluster was $55.00

sometimes from rattling the plug may not be making contact where it plugs into the cluster. try removing the instrument cluster and inspecting where it plugs into it. ive also had the cluster go bad and cause this.try the first thing and if everything is tight then the cluster may need to be replaced. hope this helps

To fix the dash going out try this. This is a common problem with the voyager,caravans and Town & Countrys. What the problem is is a cold soder in the interment cluster itself. The problem area is where the plug comes from the van into the cluster. You need to take the circuit board out of the cluster and reheat the soder on the back side of the circuit board were the plug plugs into. This will fix the cold soder permanitly I think its about 16 pins you have to reheat with the soder gun. If you don't feel comfrotable doing that you can just replace the interment cluster and it will be fine but if you buy a used one make sure it was tested. Hope this helps I have done several of them.

To fix the dash going out try this. This is a common problem with the voyager,caravans and Town & Countrys. What the problem is is a cold soder in the interment cluster itself. The problem area is where the plug comes from the van into the cluster. You need to take the circuit board out of the cluster and reheat the soder on the back side of the circuit board were the plug plugs into. This will fix the cold soder permanitly I think its about 16 pins you have to reheat with the soder gun. If you don't feel comfrotable doing that you can just replace the interment cluster and it will be fine but if you buy a used one make sure it was tested. This also may fix the ABS light and the airbag light. Hope this helps I have done several of them.

Remove the small bolts above the cluster , this should free the black plastic surround. Unclip the two plastic snaps that fit into the bottom half of the steering column and remove the plug for the trunk release button. This should expose the cluster better. There are 4 bolts in the cluster itself remove these and the cluster is free. Gently pull it out and look on the back of it for the plug, The plug has a latch on it once undone all the way the plug is free and you are able to remove it completely from the dash.

There's more than one bulb to the instrument cluster, and they are the black plugs on the back of the cluster. Twist these out and look at the filaments, if they're broken, replace them. I don't believe these are sold separately from their holder, and you'll need to purchase them from an auto parts store. The lighter colored plugs are the warning, or idiot lights and as long as these work, there's no need to change them out. Hope this helps.

My fiance has an automatic 1996 Dodge Neon, and every once in a while her speedometer begins to fail intermittently. The problem is actually an easy fix. Pry up the dashboard cover (it is just held down with pressure fasteners) and look around the instrument cluster. There should be 4 screws holding it down. Remove these screws and pull out the cluster towards you. It should come out with little trouble. There will be two black plugs mounted to the dash, with two matching sockets on the back of the cluster. What I did was take some small needle nose pliers, twist the connecters in the cluster slightly, either clockwise or counter-clockwise. Also, slide the plugs out of the dash, plug them into the cluster, and fit the cluster back into place. What I think was happening was that the plugs weren't making decent contact with the cluster, and the vibrations were jiggling them loose. So far, it has fixed the problem..